When choosing a scanner first thing you have to consider is the utility that you will give. Requirements and / or needs will be very different if you need as an auxiliary tool of study or be a working tool where you need an excellent image quality, for example photographs, graphics, etc. It is for scanning documents for further editing in electronic format. The normal scan documents for archiving and storage on the hard drive, as the paper can be lost, spoiled. Imagine that you suddenly manual order to transfer the entire archive of documents in electronic form and stored on a hard drive. In this case, you will come to the rescue and scanner.
First of all, when choosing a scanner, you should very clearly understand the specific purpose for which you plan to use your scanner. If you have to decide whether what the main tasks will be to stand in front of your scanner. From this very much will depend on its price. After the scanner - this is a very interesting thing in the sense that illiterate, you can overpay a lot of money when buying a scanner for those of its functions, which he never in his life will not be used. So, remember that the iron rule "the more expensive the better," which is true of many computer components such as memory or hard disk when you buy the scanner is not working. You just have to look at both and think that the extra money and do not overpay and buy a good scanner.
So, you need to clearly define the purpose for which purchased the scanner. If you plan on using this scanner to scan only the black and white text for subsequent editing in any text editor, for this purpose is for you, in principle, absolutely any scanner from those which are now offered in the computer market, even the cheapest. Ideally, of course, take a flatbed scanner - it is, in my opinion, the most convenient to use. Besides, now the price of amateur models of flatbed scanners are quite low and you can afford to pick up quite a decent scanner to scan the text.
The fact that this scanner to scan the selected text does not mean that using it will not be able to scan a color picture. In fact, now no longer exists in the sale of black and white flatbed scanners, and, as a rule, all the proposed models in color. But the question is how well the color picture will be scanned on the cheapest tablet remains open. In any case, be prepared for the fact that the quality of scanned color images in the case of acquisition of such a scanner, you can be very frustrating. In general, the choice of scanner to scan text, you should not pay attention to the scanner settings such as color or dynamic range. The most important thing - you should pay attention to what a given optical resolution scanner, and how fast it works.
To scan text, as a rule, it will be enough to buy a scanner with optical resolution of 300 dpi (dots per inch - dpi), as this is sufficient for most programs, OCR (for example, the most famous program for OCR now like ABBYY FineReader). With a resolution of 300 dpi, you can scan quite clearly, even very small text. Only in rare and exceptional cases, almost, for a very small text, you will need a scanner with high optical resolution. Still, the scanning speed in combination with the quality and speed of scanning software, in my opinion - the main condition for the choice of scanner to scan and further editing.
In the same case, if you're going to use quite often scan a color picture and want to get a good result, then your job is on the choice of scanner is much more complicated, and you should pay attention to some other characteristics of the scanner. Let us elaborate on the most fundamental characteristics, namely those that need your attention when choosing a scanner.
Tips to choose a prefect Scanner
Maximum resolution: Resolution is the quality that indicates the image refers to the number of dots per inch scanner can capture the more dots per inch the more accurate definition of the captured image. The resolution can be interpolated (achieved through software and the quality is not optimal), or optical, in which we can say that the resolution is real. In this case it is of better quality.
Capture Software: The scanner usually comes with a software (interface) through which we can control the scanner and perform common tasks. It is important that this software is easy to use and this in a language they understand. If you come with a manual or help better.
Connection: In this case we recommend a scanner with USB2.0 or Firewire port (higher speed than USB). These ports are faster than traditional parallel port once used by the scanners.
Reader Type: Basically there are 2 reading technologies. CCD, CIS, CIS technology is more compact and inexpensive, but offers less quality. If you need high quality photo scan CCD technology is best suited for your scanner
Color: The color depth refers to the ability of a scanner to recognize the breadth of nuances of the original document in terms of contrast. A depth of 24 bits is suitable for good quality work. This indicator is responsible for color perception scanner, namely the number of colors that the scanner will recognize and be able to handle it. Naturally, the depth of color affects the quality of the image.
Optical density: It a kind of range, where the scanner with extreme precision recognizes colors and shades. The so-called contrast ratio scanner. The necessity of this measure is that it is responsible for the quality of your scan photographs, slides, films whose quality is difficult to determine at a glance. Here at the role comes with your scanner is an excellent indicator of the optical density. Limits of optical density scanners range from 0 (white) to 4 (black). If you are demanding of the quality of the material and kind to his work, then try to choose a scanner with a maximum density. 600x600 dpi OPTICAL minimum for A4, 1200x2400 or higher (optical) so it is often necessary to scan small areas. Depth should be minimum 24-bit (16 million colors).
Type of digitized documents: All flatbed scanners, scanners to scroll.
Scan speed: It usually does not take much time. Shows how to quickly produce a preliminary scan of the scanner to view the image. The minimum scan speed lies in seconds. It is often indicated in the characteristics of the scanner. But the maximum speed of course by the time scanning is achieved when you want to get the most (to achieve the highest quality, resolution, your color photos or text with a color picture or graph). And as you probably already realized, the scanning speed is directly dependent on your requirements for image quality and the best you can adjust this figure.
Interfaces: There are several types of interfaces for scanners. Avoid scanners that plug into the parallel port, those who prefer to connect to the USB port or SCSI if your computer has a controller of this type. Most scanners today are connected via a USB-port and through the same feed from the computer itself. It does not use any power supply and adapters, which significantly saves space (no holds sockets) to avoid confusion in the wires. You just need to connect the scanner to your system unit via USB. Only pre-install the necessary drivers for your operating system, and use. Of course, this aspect does not affect much of the productive capabilities scanner.
Types of Scanners
- Handheld scanner: Almost completely disappeared. We had to move over the surface to be scanned. Ultimately, the quality and reliability of these scanners were not good.
- Sheetfed: Capable of scanning a sheet by sliding in a slot, it takes up less space on a desk but still very limited by its mode of use.
- Flatbed Scanner: The scanner is the most common. It can scan all types of opaque paper up to A4 size (mostly).
- Flatbed scanner backpack transparent (light): Offers the most versatile today. Provided that the resolution of 1200x2400 is, it can scan all documents and documents on opaque films (24x36 transparent and negative, some models also accept negative "medium format").
- Film Scanner: Specializing in negative 24x36 (in 98% of cases), it can reach very high resolutions (2400x2400 dpi more). The quality of these scanners is excellent, but their use is reserved for professionals (because of the price).
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