Comparison Canon DR-F120 vs Epson Perfection V370 Photo

— Tablet. In such scanners, the material to be scanned is placed over a special glass surface, under which a photo sensor moves; the original itself does not move. Flatbed models are the most "omnivorous": they have no restrictions on the thickness of the scanned material and usually allow you to work not only with individual sheets, but also with pages and covers of books and magazines, product labels, etc. Their disadvantage is their significant dimensions — the working surface of the scanner must be no smaller than the supported format (see "Format").

— Lengthy. In pull- through scanners, the photo sensor is stationary, and the scanned material moves relative to it using the feed mechanism. They are much more compact than tablet counterparts (see above), because. of the requirements for the dimensions of the scanner in this case, in fact, only the width remains. Such scanners make it much easier to process long materials; in addition, they are often equipped with automatic document feeders(see below for more details), which makes it much easier to work with a large amount of materials. On the other hand, the feed mechanism can only work with single sheets and will not cope with books and other bulky media.

— Tablet / lingering. The most versatile models that combine the advantages of both designs. They have both an open...ing lid with a glass surface below it, which allows you to work with bulky media (like flatbed models), and a transport mechanism that makes it easier to work with long originals and single sheets (like in broaching designs). They are equipped with two optical sensors and in some cases you can even use both at the same time. The disadvantages of such scanners are significant cost and dimensions, and therefore they are usually used in the professional field, where you often have to scan large volumes of dissimilar materials.

— Slide scanner. These scanners differ from all previous types due to the peculiarities of the processed originals — they are designed to work with transparent materials (slides), such as photographic film. Other scanners equipped with slide modules (see "Slide module") can work with slides, but it is specialized models that provide the best quality.

— Manual. The name of this type is due to the fact that such a scanner must be manually moved over the scanned surface during operation. This is not as convenient as using flatbed or broaching models (see above), especially when working with a large amount of materials. At the same time, the dimensions of hand-held scanners are even smaller than those of broaching ones, while they do not have such a drawback as a limitation on the thickness of the processed materials. Such a device can "take" an image even from a large object that cannot be placed in a flatbed scanner — for example, a box.

The highest resolution of the digital image generated by the scanner during operation. Specified in dots per inch — dpi (dots per inch).

The higher the scan resolution, the higher the resolution of the resulting image will be (with the same size of the source material) and the more accurately small details will be transmitted on it. On the other hand, high resolution noticeably affects the price of the scanner, increases the processing time and the size of the resulting file — despite the fact that the real need for high detail is not always present, and in some cases it is even unnecessary (for example, when processing an image with small artifacts, not visible at low detail). Therefore, when choosing by this parameter, you should not chase high resolution values — you should proceed from the real need and the specifics of the intended use of the scanner.

The simplest modern scanners have a resolution of about 300x300 dpi — this is quite enough for text recognition with an average font size. And in high-end professional models, this figure can exceed 7000x7000 dpi.

— CIS, abbreviation for "Contact Image Sensor" — contact image sensor. The simplest type of optical element: it is a line across the entire width of the scanner's working space, on which photocells that read the image and LEDs that provide illumination are located in a row. They are inexpensive and take up little space, which, accordingly, makes the scanners themselves cheaper and smaller. On the other hand, CIS sensors have a shallow depth of field, and even small bumps in the scanned image can be out of focus. However, in general, they are quite suitable for both personal and not too complex professional tasks.

— CCD, short for "Charge-Coupled Device" — a charge-coupled device. A much more complex design than CIS, includes a fluorescent lamp, lens and mirror. CCD scanners are larger, heavier and much more expensive than their counterparts in CIS. On the other hand, this type of optical element provides high-quality colour reproduction and a good depth of field, coping well with complex-shaped media. Therefore, advanced professional scanners are usually equipped with a CCD.

— CMOS. The abbreviation for "Complementary Metal-Oxide-Semiconductor" is a complementary metal-oxide-semiconductor structure (the designation CMOS is also used in Russian). A key feature of CMOS sensors is that they capture the scanned image as a whole, similar to photography (and not...line by line, as in other types of optical elements). In fairness, it should be noted that the "instantaneous" scanning does not give a tangible advantage in speed, because. processing the captured image takes quite a long time. However, this feature is extremely useful in cases where it is difficult to ensure the immobility of the scanned material and/or uniform movement of the optical element relative to this material. Such situations often arise when working with book and handheld scanners (see "Type"), so CMOS elements are most popular in such devices.

The maximum image size that the scanner can process at one time, both horizontally and vertically. You should pay attention to this parameter if you need the exact dimensions of the scanner's working area, down to a millimetre: although standard formats are used to designate these dimensions (see "Format"), in fact the dimensions may differ from them.

The maximum optical density of a dark image that the scanner can distinguish from pure black. Optical density characterizes how much of the light falling on the image was reflected (for opaque images) or transmitted (for transparent). The higher the optical density, the less light the object reflects / transmits. Accordingly, the higher the optical density of the scanner, the higher its sensitivity and the better it is suitable for working with dark images.

Under the internal colour depth is meant the number of shades of the image that the scanner itself can recognize; it should not be confused with external depth, which is the amount of hue transmitted to the computer (see below). Colour depth is expressed as the number of bits of information used to encode data about each colour. The total number of colour shades in this case is 2 to the power of n, where n is the colour depth. So, a 24-bit scanner recognizes 16.7 million colours — which is more than one and a half times more than the human eye, and quite enough for simple everyday tasks. In more advanced professional models, colour depth can reach 96 bits. Although the characteristics of the image transmitted to the computer are described by the external colour depth (which can be less than the internal colour depth), the internal depth, however, also affects its quality: other things being equal, a scanner with a higher internal depth provides more accurate colour reproduction.

External colour depth characterizes the maximum possible number of colour shades in the image transmitted by the scanner to the computer. A depth of 24 bits is considered quite enough for non-professional tasks, in more advanced models this parameter can reach 96 bits. For details on colour depths and their relationship, see "Colour Depth (Int.)"

The black and white scanning speed provided by the device. Usually, the maximum processing speed for an A4 sheet is indicated, i.e. speed at the lowest resolution. In fact, the speed is usually lower and depends on both the resolution and the size of the original material. The higher the scanning speed, the more convenient it is to work with the scanner; pay special attention to this parameter if you plan to work with numerous black and white images.

Colour scanning speed provided by the device. In fact, it depends on the selected resolution, colour depth and original dimensions; the characteristics most often indicate the speed for an A4 sheet at the minimum resolution and colour depth, i.e. maximum possible speed. If you only need to scan one or more sheets from time to time, high speed is not too critical, but for working with a large amount of materials, you should look for fast models.