Scanner- tse attachment, which analyzes the object (sound the image, text), creates a digital copy of the image of the object. The process of making a copy of a copy is called scanning.
In 1857, the Florentine abbey of Giovanni Caselli had a vinaysh device for transmitting an image to a viewer, by the name of a pantelegraph. The image to be transmitted was applied to the drum with a streak-through ink and was read behind an additional head. In 1902, the German physicist Arthur Korn patented the technology of photoelectric scanning, which was called telefax. The image is transmitted on a transparent drum, which wraps, passes the light through the lamp, which moves on the axis of the drum, passing through the crystal of the original and through the prism on the axis of the drum and passing the lens on the selenium photodetector. Tsya technology dosі zastosovuєtsya in drum scanners. Nadali, with the development of narrations, perfected the photodetector, found the flatbed method of scanning, but the principle of digitizing the image remains unaltered.
Main characteristics of scanners
Optical allowed
Є the main characteristic of the scanner. The scanner captures images not in sequence, but in rows. Along the vertical of the flatbed scanner, a cluster of light-sensitive elements collapses and is seen at the points of the image row by row. The more light sensitive elements the scanner has, the more dots can be taken from the horizontal skin smog of the image. This is called optical resolution. It is determined by the number of light sensitive elements (photo sensors) that fall on an inch of the horizontal image that is scanned. Sound yoga for the number of dots per inch - dpi (dots per inch). Normal rіven allowed no less than 600 dpi, more distance more - means blocking the way for optics, expensive light-sensitive elements, and zbіshuvati hour for scanning. For the processing of slides, more space is needed 1200 dpi.
Dozvil X
This parameter shows the number of pixels in a photosensitive line, among which an image is formed. Razdіlna zdatnіst є one of the main characteristics of the scanner. Most models can be optically distributed scanner 600 or 1200 dpi (dots per inch). Yogo is enough for making an okіsnoї copy. For professional work from the images, more high and varied buildings are needed.
Dozvil by Y
This parameter is determined by the magnitude of the stroke of the crank engine and the accuracy of the robotic mechanics. The mechanical expansion of the scanner is significant for the optical expansion of the photo line. The most optical distribution of the line of photocells is significant for the overall quality of the scanned image.
Scanning speed
Shvidkіst skanuvannya to lay down in the razdіlnoї zdatnostі skanuvannya that razmіru to the original. Ring out, the scribes indicate the parameter for the A4 format. The speed of scanning can be reduced by a number of sides for a piece of paper, or for an hour, necessary for scanning one side. Some times it dies at the number of scanned lines for a second.
Glibina color
As a rule, virobniks indicate two values for depth of color - internal depth and depth. Internal depth - the design of the ADC (analogue-to-digital converter) of the scanner, it is necessary to tell about those, how many colors the scanner has in the building. Zovnishnya glybin - tse kіlkіst kolorіv, yakі the scanner can be transferred to the computer. More models of vicorist for transferring to the color 24 bits (8 per leather color). For standard zavdan in the office, that booth is enough. Also, if you choose to use a scanner for serious work with graphics, try to know the model with a large number of discharges.
Maximum optical width
The maximum optical width of the scanner is the same as the optical width of the original, so that the scanner is exposed to "new dark". The greater the value, the greater the sensitivity of the scanner and the greater the clarity of scanning dark images.
Light type
Xenon lamps take a little time to warm up, a trivial term of service and small sizes. Cold cathode fluorescent lamps are cheap and may have a long service life. Light-emitting diodes (LED) have small rosemaries, low energy consumption and do not take an hour to warm up. And for the brightness of color transfer, LED-scanners are offered to scanners with fluorescent and xenon lamps.
Scanner sensor type
For scanners and MFPs, one of the two types of sensors based on different technologies will sound:
- CIS- Contact Image Sensor / contact image sensor;
- CCD- Charge-Coupled Device / attachment with charging bell (PZZ).
CISє line of photocells, as an additional width of the scanned surface. Under the hour of scanning, it moves under the fold, and row after row transmits information about the image on the original at the same time as the electric signal. For illumination, vicorous lights are sounded, as if they were stashed in the direct proximity to the photo line on the same platform. Scanners based on CIS can have a simple design, a thin body and a small size, which allows the scanner to be used even thinner and lighter for similar scanners with CCD-sensors. CIS scanners tend to be cheaper than CCD based scanners. The main nedolіk CIS polagaє at small depths of sharpness.
Photo sensor based on CCD- There is a special analog integrated microcircuit, which is made up of light-sensitive photodiodes, a viconan on the basis of silicon, which uses the PZZ vicorist technology - is attached with a charging sound.
The CCD-matrix is composed of polysilicon, water-silicon in the form of a silicon lining, in which, when a voltage is applied through a polysilicon gate, electrical potentials change near the electrodes. Before the exposition, sound the supply of a singing combination of voltages on the electric device, all charges are thrown off, which were previously settled, and all the elements are brought to an identical camp. Further, the combination of voltage on the electrodes creates a potential well, in which electrons can accumulate, which are hidden in the given pixels of the matrix in the aftermath of an influx of light when exposed. The more intense the light flow during the exposure hour, the more electrons accumulate in the potential well, the greater the bag charge of the pixel.
After the exposure of the last change in the voltage on the electrodes, they are formed near the skin pixel and instructed him to expand the potential, which will cause the charge to transfer to a given direct line, leaving the elements in the matrix.
See scanners
- flatbeds - the largest extension of the type of scanners, scallops provide maximum clarity for the coristuvach - high quality and pleasant scanning speed. Using a tablet, we can see through the fold of the folds of the scanning mechanism.
- Rucnі - they have a dvigun, owe, ok' -єkkt to be given to Koristuvachev’s scanning, ogi ioe plus є cheapness that mobille, under the zyoma Masa Nednikiv - nizka Rodilnu, Malu Shvidki, university of the dark It will be important to move the scanner out of the current port.
- sheet feed (stretch) - the paper arch is inserted into the slot and stretched along the straight rollers in the middle of the scanner and lifted the lamp. May be smaller, similar to the tablet, the prote may be scanned only by the archery, which surrounds the traffic jams more importantly with the offices of the companies. A lot of models can be attached to automatic filing, which allows you to quickly scan a large number of documents.
- planetary or book scanners - stop for scanning books or documents, which are easy to read. When scanning, there is no contact with the object that is being scanned (like in flatbed scanners). Book scanners are used for scanning bound documents. The scans are made with the front side uphill - in such a rank, your children's scans do not break in the face of the glottis of the sides when reading loudly. Tse zabіgaє їх їх poshkodennya that allows koristuvachevі bachiti document in the process of scanning.
- slide scanners - as the name suggests, they serve for scanning melted slides, they are produced as independent attachments, and from the look of additional modules to the great scanners.
- barcode scanner - small, compact model for scanning barcodes in goods at stores.
Principle dії
The object to be scanned is placed on the slope of the tablet with the scanned surface down. Under the slope there is a ruhoma lamp, the ruh is regulated by a crock dvigun. Light, see the image of the object, through the system of mirrors, touch it to a sensitive matrix, send it to the ADC and transfer it to the computer. Behind the skin of the engine, the object's wife is scanned, so we can then go to the software security in the wild image.
The image is always scanned in the RAW format - and then it is converted to the original graphic format due to the constant adjustment of the sharpness, the contrast ratio is thin. This conversion takes place either in the scanner itself, or in the computer - depending on the model of a particular scanner. On the parameters and brightness of RAW data, add such hardware adjustments of the scanner, such as the hour of the matrix exposure, the equal calibration of white and black, and so on.
Scaneri- Attachment for automatic reading and introduction of graphic information into the PC (texts, graphics, small prints, armchair).
The file created by the scanner is called a bitmap.
To work with a PC scanner, the mother is responsible for a special program (driver) that complies with the TWAIN standard. As such a driver for installations on a computer, you can work with a large number of TWAIN - smart scanners and edit files in graphic editors that support the TWAIN standard: Abobe Photoshop, Corel Draw.
Use these different scanners:
manual,
tablets,
drums,
form scanners,
barcode scanner.
Hand scanner є placed in a single building a line of svetlodiodіv i dzherelo svіtla. The movement of the mechanism to the original is done "manually" by a shorthand.
flatbed scanner . The second attachment transfers the scanning head (line of light diodes) to the original after the help of the small dvigun.
Drum Scanners . In scanners of this type, the outer material is fixed on the cylindrical surface of the drum, which wraps around with great swirl.
Form Scanner recognized for the introduction of data from standard forms, zapovnenih "by hand" (census of the population, choice).
Barcode Scanner are used for entering data encoded like a barcode.
Flatbed scanners are the most widely used.
Principle dії - promin light, hitting the surface material, fixing with special elements (PZZ) - attach it with a charging link.
The main smooth parameters of flatbed scanners are:
different buildings,
connection type
dynamic range
Productivity
Reading is required for the help of the PZZ-matrix. The scanner has a Vikonan CCD-matrix in front of the line, cameras - in front of the field. The more elements are found in the PZZ-matrix, the more beautiful.
The size of the building is determined by the number of elements of the PZZ, which fall by 1 inch. A typical indicator for office screening is 1200 - 2400 dpi (dots perinch) - dots per inch for professional graphics 4800*9600.
Razryadnіst (deep color) shows how much accurate information about the scanned point. 48 bits - 16.8 million colors are important for a sufficient depth of color.
The dynamic range of the scanner is characterized by the ability to distinguish between the closest images. The dynamic range is measured as the logarithm of the brightness ratio of the lightest and darkest woods. A typical indicator for office scanners is 1.8 - 2.0.
The productivity of the scanner is determined by the scanning speed of a standard arch of paper and to lie both in the mechanical part of the scanner and in the type of interface.
Graphic tablets (digitizers) are intended for the introduction of artistic graphic information. It is based on the fixation of a pen on a tablet.
Digital cameras, like scanners, take graphic data for the help of PZZ, combined with a rectangular matrix. The main parameter is the rozdіlna zdatnіst, yak to fall in the amount of the PZZ. In this hour, the shortest models can be up to 10 million pixels. Companies: Olympus, Nikon, Minolta, Canon (Zoom-up to 7 times).
What work, how do you need to transfer the instructed on the paper image by electronic mail? Without a doubt, everyone knows such an attachment, like a scanner. It repeatedly helped people to save old photographs, as they robbed our children and grandmothers, to transfer important documents into electronic format, without leaving them on a PC.
Zagalom, the scanner is rich in color and ninth in rich offices is simply indispensable. To correctly select which model you need, follow the main characteristics of the scanner.
What is it?
It’s better not to go back to scientific terms, but to explain with my simple words what kind of attachment it is. The scanner is capable of reading the process of reading, which directs onto flat data (for example, papier). Please, koristuvach accept a digital document for transferring it to the state or saving it in electronic format. Scanning causes the creation of a digital image of the original image of the ADC starter object. After that, the picture is sent to the EOM for an additional input / output system.
First try
Few people know, but the main characteristics of the scanner were known to contemporaries from 1857. Todi an alternative to the current arrangement by creating an abat from Florence by Giovanni Caselli. Yogo prilad pratsyuvav already primitive shdo modern technologies. Then, in order to transfer the image to the viewer, it was necessary to put yoga on the drum for the help of the streak-through ink, and then put the picture behind the help of the neck. Such an attachment was called a pantelegraph.
Already after the first century, the German physicist conducted his experiment, at the hour of which telefax was patented. Arthur Korn developed the technique of photoelectric scanning. The yoga principle is unforgivable: the picture stuck to the drum, but it was still clear. The lamp was so fixed that the flow of light could move. Vіn passing through the original image and directing it to the selenium photodetector, and then penetrating through the prism and the objective.
The faster the conductors developed, the faster the photo receiver improved. Irrespective of those who later blamed the tablet method, the principle itself practically remained unchanged.
Characteristics
First of all, it is necessary to pay attention to the characteristics of the scanner. Їх іsnuє tsіliy spectrum and zagalnopriynyatoї clasifikatsії nemaє. The skin parameter is to be deposited according to the purpose of recognition. Tim is not less, є the main characteristics, for which і next choose a scanner. Among them are the swidkіst of the work, the depth of the color, the razdіlna zdatnіst otrimannogo izobrazhenya and so on.
Beauty in the details
Characteristics of the scanner are different, but it is one of the main parameters. Forgive me: the authorities are responsible for resolving the smallest details of the image, as they will be transmitted every hour of scanning. Allowed to specify at dpi. This value indicates the number of visible dots per inch of the image. Sound the scribe indicating the indications of all three permitted:
- mechanical;
- optical;
- interpolation.
First, it is necessary to designate the carriage with a PZZ-line for the hour of the image movement. The fact that the mechanical division of the building is greater than the optical one, the vikorist virobnik against the incompetent coristuvach. For TX wines, it shows that the optical value is 300x600 dpi. However, if interpolation is daily on the extension, it will work with a minimum value of 300 dpi.
Interpolation razdіlna zdatnіst vіdpovіdaє for rozmіr, which can be taken when scaling the image 16 times. In principle, the least important parameter, and it is practical not to avenge any additional data. Ale yoga maker can win against the purchase, showing on the box 4800 dpi. Such a figure can strike an unknown person. Ale skin, who does not know the characteristics of the scanner, ale zirbrassya buy this attachment, is guilty of lying, that the real optical value can be as high as 300 dpi.
The main parameter is the optical distribution of buildings. To determine this, it is necessary to calculate the concentration of elements in the light sensitive line. For this, it is necessary to have a large number of details for the new one to divide the width. This parameter, as it was said earlier, is the most significant way of detailing the picture. Therefore, it is rarely possible to see on the box with an outbuilding, so both the picker and the seller try to attach real displays.
"Dry" numbers
As mentioned earlier, it is not easy to choose such attachments. Characteristics of scanners can be confused by an undelivered purchase, so before buying it is better to use the skin parameter. The offensive after the rozdilnoi zdatnosti є razryadnistnost, or the depth of sight. This characteristic indicates the number of bits, which is necessary for collecting information about the color of a pixel. Less memory will require black and white scanners. The stench mayut one discharge. Monochrome troch is more - 8, and color - 24 ranks. Scanners for the road segment can be 36-bit.
The depth of the color is different and inner. The same qі pozniki vkazuє virobnik. Internally, it is characterized by the size of an analog-to-digital transformer, which helps to determine the number of colors, which can be used as a scanner. Zovnishnya glybin - a lot of sounds, like a building transfer device to a PC.
If you need an attachment to the office or home, pidide and the standard capacity is 24 bits. If so, a scanner is needed for printing and similar organizations, rather search for a 48-bit attachment.
Optical width
The characteristics of the scanner do not end there. I don’t go into the details of the scientific explanation, but I’ll add dark pictures to the building: the more sensitive the attachment, the darker pictures will be digitized.
The order of the cym parameter is the interval of the optical gap. Yogo can be virahuvati z Vіn darіvnyuє vіdshennyu іlkostі falling on the original of light to the ііlkostі, scho vіbryazhєєєєє. The average range for 24-bit capacity may be 1.8-2.3 D.
Shvidkist
This parameter is often forgotten to indicate what is called for. Prote the rate of scanning to deposit depending on the number of factors. First of all, the construction is of a high quality and reconciliation with the original. Shvidkіst can indicate the number of sides in the quill, or just an hour, with one sheet being processed. And also wimming lines that are scanned per second.
The scope of the scanned area can also be different. The widest solution is sheet A4. Such models are set up in offices and booths. On any business, you can win the A3 format. For hand-held scanners, the scope of the smuga is more expensive 11 div.
interface
Don't let the characteristics of the scanner be particularly important. For this category, you can add such a parameter as an interface. Vіn mozhe buti kіlkoh vіdіv. Here you can see your own interface as a retailer. Yogo was stuck earlier in scanner models. Its popularity faded after the fact that it became possible to upgrade the PC operating system. The reason for this was that after the exit from the sale of that other scanner, it allowed for the optimization of its interface for the other system, also, the same function.
The next interface, having taken off some of them, you can learn from young people with flatbed scanners. You can’t see anything in the middle of the annex. Їx call vikoristovuyut for the scan of the photo chi bet sides of the text.
The PCMCIA interface can also be seen infrequently, and the SCSI axis is becoming the standard for high performance applications. Ninі z cim _interface let out the most powerful machines z 30 and 36 bits.
USB-interface - the remaining and fashionable option. Vіn active recommendations for rich models, prote lacking goodness for highly productive devices.
Dzherelo light
This parameter is rarely covered when choosing a scanner. Use three types of lighting:
- xenon;
- fluorescent;
- bright day.
Xenon lamps can be small in size, serve for a long time and take a short time to warm up. Fluorescent lighting is cheaper to dow, then it will last longer. Lights are small, they save little energy and heat up quickly. Sound the rest of the LED-scanners with the same ones.
Raznomanіtnіst
After that, as the scanner itself showed up without a hitch, it became modified and filled with different forms. Infection tsy pristriy can be classified for low parametrіv. See scanners and their characteristics have become globally accepted, and so far there have been no future technological innovations in this sphere.
In order to break qi fit on the category, follow the following signs:
- image forming method;
- Budov kinematic mechanism;
- variety of image;
- characteristics of the original;
- interface: hardware and software.
vidi
Also, according to all the best parameters, you can choose your own scanner. Vin can be:
- tablet;
- bookish;
- manual;
- leaf yarn;
- planetary;
- drumming;
- ultrasonic, etc.
Looked at the scanner's view too richly. Let's talk about the main and most popular.
The tablet infection is the most popular and handy. Sound the models of this type even more like the ones with swedes. The names are similar to the tablet, so they took that name. In order to scan the image with such an attachment, you need to open the cover, lay the sheet on the slope with the picture down, close the cover and press “start”.
The hand scanner does not have a motor. To that, to make an image, it is necessary to independently move yoga. The main advantage of such models is their price. And the axis of the shortcomings is too rich: the building is filthy, the building is low, the scantness is low, and the swedness is small.
The book scanner is recognized for processing brochure documents. In order to get the necessary information, it is necessary to put it not down the "disguise", like a tablet, but uphill. Yakist is good.
The leaf-spinning scanner is not too hard. To complete the document, insert the sheet at the gap and stretch through the shaft, which is located in the middle. The whole scanner works with song formats and okremi arches.
The planetary apparatus works out of papers, as it is easy to mess up. Vіn liquidate contact with the object, with the help of which you can save the integrity of the material.
Drum attachments are rattling on the printing presses and they see the exact image. Slide scanners are made from melted slides. Scan the barcode quickly, if you come to the store at the checkout. 3D attachments are newfangled. They can scan real objects, they transform into a digital form and transform into a three-dimensional model. The ultrasound scanner is the most famous ultrasound, as it is used in medicine for the investigation of internal organs.
Chotiri in one
Іsnuє combined copying module, facsimile mechanism, printer, scanner. Yoga indicators are revitalizing. Basically, such accessories can be streak, laser, or light for each other's technology. Like a scanner, an MFP can be colorful or monochrome.
The main advantage of such an outbuilding is the economy of space at home or in the office. It is not necessary for Koristuvachev to move the papers from one month to the next. Zruchno pratsyuvati with one outhouse. Also, the MFP can pay a small price for a sum, but I had a chance to pay for the purchase of a leather accessory.
New in 2016
If you are familiar with the characteristics of the scanner, you can find out which device to use. Which year has seen a few new models, which can zatsіkaviti koristuvach. For example, the HP ScanJet scanner, the characteristic of which is the enemy, can cost less than 2 thousand rubles. With this, you will have access to a 48-bit deep color scan tool, a popular USB 2.0 socket, and a variety of operating systems. Vzagali, HP scanners, the characteristics of such a bula on the most equal level, are leaders in the market in this segment. The company also has wonderful models of richly functional outbuildings.
Which fate has appeared on the market and those who impress not only with functions, but with price. The readings of the Pro scanner are true even higher. In addition, since this tablet device can have an adapter for meltable sliders and a USB 2.0 interface, its main feature is the 6400 × 9600 dpi resolution. In order of these parameters, the price of the scanner varies from 80 to 100 thousand rubles.
Among the new products is a budget option. The characteristic of the Canon CanoScan 9000F scanner is in the middle. New building - 9600×9600 dpi. Warehouse price 12 thousand carbovants. Notes about this model for the "four". Worth noting that marketers are starting their “song” again, telling about the unknown parameters. In fact, the replacement is 48 bits, but we take less than 12. For the skin canal, the replacement is 16 more than 12 bits. Prote є th tі, who is satisfied with the speed of the work, the high distribution of buildings and the quality of the materials of the annex itself.
Vzagali, to choose a good scanner, it is not necessary for learning, especially the cost of outstanding coristuvachiv. For photocopies of the great permission is not necessary. The nadvisoka swidkіst tezh not maє znachennya. Therefore, it is better to choose a scanner, which you will definitely need for the full range of functionality.
Let's take a look at the constructive principles of the work of today's flatbed scanners and estimate the importance of the main characteristics, on the basis of which you should pay attention when buying such attachments.
A flatbed scanner, intended for home use, - ce attachment, "imprisonment" for the execution of two main tasks: the first - scanning text documents with further recognition, and the other - digitizing photographs and other images. A lot of models of the middle price category are equipped with a slide module that allows you to scan the originals; Basically, it is positive and negative photothermal.
To enter text documents into a computer, one scanner is not enough: a special program for recognizing texts is needed (this is the name of the OCR program (in English optical character recognition - "optical character recognition")), so that you can save data into a text file of that format. One of the shortest recognition programs is rightly respected by the Russian company ABBYY FineReader.
Another task is more complicated. For a good digitization of color photography, you need optics, a matrix and mechanics; In addition, there is a lot of deposit and type of scanner driver. Fortunately, modern drivers can correct the graphical interface, which allows in the process of scanning to correct some defects in the original, including a heavily rumpled raster, lack of clarity and color creation. A lot of scanners are equipped with the simplest graphic editors, suitable for processing images and, in various ways, for creating photo albums. Fans of painting or photography will have a chance to master advanced packages such as Adobe Photoshop or Gimp.
As for the price range, a good A4 flatbed scanner costs 100 to 150 dollars, and models for a price of 150 to 250 dollars, as a rule, are more than satisfied with the most expensive ones. Cheaper models for 100 dollars can be seen only as a budget solution, but with a stink graphics, they work in the middle.
Technical characteristics of scanners
A flatbed scanner is a flat-panel unit with a fold, an object is placed on the yak, which makes it possible to scan. There are two types of flatbed scanners, which are distinguished by the type of scanning element. The largest expansion type is CCD-line (CCD-attachment with charging link) or CCD-line. Such an element is composed of many sensors, sensitive to the level of lightness. Line "їїde" vzdovzh oblast, scho skanuєtsya, i ryadkovo є іnformatsiyu pro її svetlenіnіst. A special optical system is used to design the image from the illuminated original on the CCD line.
Another type of flatbed scanners are models based on the CIS line (contact image sensor). On the view of CCD-scanners, in CIS-models, a line of light diodes is installed, the width of which is equal to the width of the area being scanned. Tim himself loses the need for a foldable, rugged optical system, so such a scanner is richly thin and cheap, lower CCD models.
Just like CCD-scanners, so do CIS-scanners, they have their own advantages and shortcomings. The CCD scanner requires power, while the CIS scanner can be powered via the USB port. CCD-scanners are equally bulky, and the actual models of CIS-scanners are not worthy of a standard book. Tim is not mensh, I don’t recommend buying a CIS scanner for a booth, I don’t recommend it. On the right, since the chips in such a scanner are practically daily optical system, the value of the depth of sharpness and the hour of work is approaching zero. What does it mean? For example, when scanning a tovstoy book, the letters in the field of life for the CIS-scanner will be unrecognizable, and when scanning a trivial object, only that part will be seen, as if it was pressed down to the fold. Nevipadkovo in the name of the sensor itself is the word "contact". From the other side, such devices miraculously cope with scanning documents on okremih sheets, and the richness of the color, in spite of the expansion of thoughts, is no longer the flooring in the form of thinness, which is safe for CCD scanners. But the lack of depth of sharpness of the flooring sounds like a sphere of congestion of such outbuildings, which the CIS-scanner does not have any sensation at home.
Dozvil. The characteristics of a typical middle-class per-button scanner indicate that it works with a separate building of 2400 x 4800 pixels per inch (dpi). What does it mean? In this mode, 2400 dpi - optical separation of the building horizontally is real, as it allows you to take into account the optics and matrix installed in the scanner. 4800 dots (or, more accurately, short) per inch - this is the name of the hardware or mechanical distribution of buildings, as it characterizes the accuracy of moving the line with sensors across the scanned area, that is, vertically. Real razdіlna zdatnіst, zvichayno, no matter what 2400 dpi, the shards of optics and the matrix simply do not allow the scanner to "look" more beyond the perspective of precise mechanics. The name of the two values for the specification of quantities is the same optical limit.
The interpolation allowance is an absolutely stupid parameter (like "digital improvement" in cameras), shards in this type of "advancement of building development" can be reached for additional growth of additional points on the basis of the characteristics of their real money. Obviously, you don’t take away more detail, but it’s important to complete the size of the file. The real allowance is 9600 or 19200 pixels per inch on a per-bottom scanner and you don’t take anything away, so for numbers of this order, indicated on the scanner box for a hundred or two dollars, you can simply not pay attention: .
Cob cob scanners can have an optical depth of 600 or 1200 dpi, with the help of which a separation of 600 dpi is enough for an important job, including scanning photographs and reading amateur slides. Hardware razdіlna zdatnіst mozhe zminyuvatsya from 1200 to 4800 dpi per inch.
Glybina chi razryadnist color. This parameter characterizes the maximum number of colors that can be used to build a scanner, so that you can tell about the quality of color transfer to the building. Most of the scanners indicate the internal capacity, so that they can be up to the capabilities of an analog-to-digital converter (ADC) scanner. The greater number of current models is 48-bit ADC, because the leather color (black, green and blue) is described in the middle of the scanner by 16 bits of information. Vtim, for a non-professional 48-bit depth of color is clearly transcendental. Navit mass graphic editors, as a rule, do not work with 48-bit color. Practically the only blame is Adobe Photoshop, that one is more popular (for obvious reasons) less in Russia. And yet, for any software package for more editing operations, it can be brought up to 24-bit color (the so-called True Color titles), and such a capacity on the output is guaranteed by any modern flatbed scanner. Supporting the high color gradation of the color scheme, which sometimes allows you to adjust the image on the driver’s level.
Dynamic range. Dynamic range (otherwise optical width) to talk about those, how well the scanner of the building creates smooth color transitions, as well as how much good additions "distinguish" the light and dark fragments of the original. The dynamic range of flatbed scanners is rather modest, which, as a rule, does not indicate this, but if it does, it is highly dependent. For models of the middle class, the vins are at the boundary between D1.8 and D3.0. For that very reason, tablets are bad at coping with scanning originals and especially negative photos, as they can increase optical clarity. Specialized slide scanners can have a dynamic range, as a rule, in the range of D3.2 to D3.6, and the maximum theoretical value of the optical gap is D4.0.
Scanning speed. The speed of the work of the on-button scanners is not too high, especially when scanning color photographs from a large building: this process can stretch up to five times. Shvidko such devices are less used for digitizing text documents.
interface. While older models often featured a more parallel (printer) port and a swedish SCSI, current models are equipped with at least a USB 1.1 interface, and all new ones are equipped with a swedish USB 2.0. Another promising interface is IEEE 1394 (in FireWire, iLink), which has long been present on all Apple computers, as well as on all machines with sound cards from the Creative Audigy and Audigy 2 families. nothing. Practically all mid-range scanners are equipped with a USB interface.
Service is good. Golovne, on what should be respected, - the scanner cover can close not only thin originals, but also books or magazines. If you don’t have the ability, then you happen to squeeze such objects to the point of being important, but not only unhanded, but you can bring them to the point of confusion. A lot of modern models are provided with buttons that allow you to take quick access to some driver functions (for example, scan to a file, scan and send to a printer, or send an e-mail just like that), however, to get them all the time, as a show of practice, not to be intrusive scanner.
slide adapter. All scanners are equipped with a slide adapter, suitable for scanning slides and negative films. However, as we said more, due to the lack of dynamic range of mass tablets, the results are average. Therefore, if you need to convert your analog photo archives into digital form, it is better to bring a slide scanner, or go back to a specialized digital photo laboratory, which will be bigger.
The technical characteristics of flatbed scanners in the price range from 100 to 150 dollars differ insignificantly, so when choosing, you can safely come out of the best aesthetic advantages, since all models have a different design, but may be the same ability.
On the next side, you can get acquainted with the latest models of flatbed scanners, presented on the Russian market.
Canon CanoScan 5200F
A flatbed scanner based on a CCD-matrix has an optical capacity of 2400 dpi and a hardware of 4800 dpi, internal color depth - 48 bits, outside color - 48 or 24 bits. Applications dynamic range - D3.3. Add a slide module and connect to a PC via a USB 2.0 interface. The proprietary Easy Color Matching feature ensures that the color of the scanned image is accurately transferred to each other on Canon's handy inkjet printers. The delivery set includes OCR-program OmniPage SE OCR 2.0. Dimensions - 285 x 512 x 112 mm, car - about 4.1 kg, approximate price - 160 dollars.
Advantages: high razdіlna zdatnіst, shvidkіsny Іnfeys, vbudovaniya slide-module, the system of vіdpіdnostі kolorіv pіd hаdruk on Canon printers.
Noodles: great is the vaga, the greatest price.
Epson Perfection 2480
The scanner is based on CCD-matrix and works with an optical distribution of 2400 dpi and a hardware one of 4800 dpi. Attachment supports 48-bit display color (both internal and external) and may display dynamic range D3.2. The cover of the device has a slide module. The connection to the computer is connected with a standard USB 2.0 interface. The model works even with a high speed of work: scanning a color photo in A4 format with a separate building of 300 dpi, so with a printing quality, it takes a total of 15 seconds. The scanner is equipped with the FineReader Sprint software. Outbuildings - 275 x 419 x 86 mm, wagon - 3 kg, approximate price - 140 US dollars.
Advantages: vysoki razdіlna zdatnіst and svidkodіya, svydkіsny _interfeys, vbudovaniy slide-module, FineReader Sprint in the kit.
Noodles: foldability of driver adjustment in Professional mode.
Genius ColorPage-HR8 Slim
The model produced by KYE Systems is equipped with a CCD-matrix and works with an optical splitter of 2400 dpi; depth of color - 48 bits. The extension has a slide module and a standard USB 2.0 port. The package includes a stand for vertical installation of the scanner (only for savings), as well as the text recognition program ABBYY FineReader. Cicavo, that the scanner is playing a melody during the scanning process. Dimensions - 490 x 155 x 390, wagon - 4 kg, approximate price - 110 dollars.
Advantages: high-rise building, swedish interface, built-in slide module, stand for vertical installation, ABBYY FineReader included, price added.
Noodles: the vaga is great, the "bear" image of the brand can influence potential buyers.
HP ScanJet 4070
The model on the basis of CCD-matrix is supported by optical and hardware distribution at 2400 dpi and the color depth at 48 bits. The scanner cover has a slide module. The scanner is connected to a computer via a USB 2.0 interface. An hour of scanning a color photograph with a size of 10 x 15 cm is no more than 25 seconds. The kit comes with a program for recognizing the text I.R.I.S. Readiris. The dimensions of the scanner are 298 x 472 x 90 mm, the weight is 3.29 kg, and the approximate price is $150.
Advantages: high-rise building, swedish interface, built-in slide module.
Noodles: included with the FineReader kit.
Optical allowed- Vymiryuetsya in dots per inch (dots per inch, dpi). The characteristic, as it shows, that there is more diversity in the building, more information about the original can be entered into the computer and given further processing. Such a characteristic is often induced, like "interpolated allowed" (interpolated allowed). The value of this indicator is doubtful - ce umovny allowed it, to which scanner program "takes care of" the points that are daily. This parameter is not suitable for the scanner mechanism and, as interpolation is still necessary, then the work is shorter after scanning for the help of a garnet graphic package.
Glibina color- the same characteristic, which indicates the number of colors, how the scanner can be recognized. Most computer programs, with a few professional graphic packages, such as Photoshop, work with 24 bit colors (the total number of colors is 16.77 million per dot). Scanners typically have a maximum of 30 bits, and most of the flatbed scanners have 36 bits or more. Obviously, you can vindicate the power - now the scanner can recognize more bits, lower vin can be transferred to the computer. But not all otrimani beati are equal. In scanners with PZZ sensors, the two upper bits of the theoretical depth of the color sound "noisy" and do not carry accurate information about the color. The most obvious last of the "noise" battles is the lack of interruption, smooth transitions between the sum of the gradations of clarity in the digitized images. Obviously, in a 36-bit scanner, "noise" bits can be destroyed far, and in a final digitized image, there are more pure tones per color channel.
Optical widthє characteristic of the original, which is equal to the tenth logarithm of the light falling on the original, to the light of the fermented (or to the last - for the visionary originals). The minimum possible value is 0.0 D - ideally white (prozory) original. The value 4.0 D is absolutely black (opaque) original. Dynamic range The scanner characterizes, which range of optical widths to the original can be recognized by the scanner, without using any light or shadows of the original. The maximum optical width of the scanner is the same as the optical width of the original, as the scanner is still exposed to the dark. All images of the original are dark for the whole cordon, the scanner cannot be distinguished. The given value is more good for simple office scanners, so that they can take in details, like in dark, so in light cases, slide and, more negative, like professional models. As a rule, for most flatbed scanners, the value is given to lie between 1.7D (office models) and 3.4D (non-professional models). Most paper originals, whether it be a photograph or a magazine visor, can have an optical resolution of no more than 2.5D. The slide must be used for sound scanning, as a rule the dynamic range is greater than 2.7 D (Sound 3.0 - 3.8). Only a few negatives and x-rays may have a higher high resolution (3.3D - 4.0D).
behind interface type Scanners are divided into several categories:
SCSI (Small Computer Systems Interface). Scanners with a SCSI interface were the most widespread for that reason. The era of SCSI scanners is coming (otherwise it has gone) to the end. The main reason is the emergence of high-performance USB and FireWire interfaces, which do not affect particular delicacy when connected, or additional adapters. In the middle of the SCSI interface, you can see a high bandwidth building, as well as the ability to connect up to seven different devices to one bus. Of the main shortcomings of SCSI - the high degree of organization of the interface and the need to receive an additional controller.
USB (Universal Serial Bus). The USB interface has the widest possible breadth of integration for all modern system boards as the main difference for peripheral devices. Today, the absolute majority of scanners for the home are produced by themselves from the USB interface. A group of CIS-scanners will take the necessary life from the USB-port.
FireWire (IEEE1394) is the last high-width input / output interface, powered by USB, which does not require a controller to manage the VIN. Organization of yoga robots vikonan for peer-to-peer scheme. Vlasne for rahunok tsgogo i reach lower (equally from USB) occupancy of the central processor.
In the rest of the hour, the scanners will try to scan a few scanners from two interfaces (for example, LPT and USB). Such versatility can be more expensive when modernizing the scanner.