Most of the modern scanners are provided with USB or SCSI. But if you are not planning to do so, and only will make a scan or two occasionally, this characteristic shouldn’t be decisive for you. If you are going to use a machine to scan large piles of documents regularly, the speed really matters. Scanning speed is one more important feature to consider, while you are choosing the best OCR scanner. Nevertheless, we recommend choosing the model with an OD rating of about 3.0.

Scanners for common use may have no dynamic range ratings. In general terms, density range shows the brightest and the darkest recordings captured by your OCR scanner. 0 means an excellent white, 4 stands for irreproachable black. Many machines have a logarithmic scale from 0 to 4. This feature shows how good a scanner records a variety of tones. A 24-bit OCR document scanner ensures superior performance and is absolutely great for office use, although you should know that some models offer a color depth of 48 bits.ĭynamic range is also called density range or optical density (OD). So, a high color depth means that a machine can record and store large files precisely. The higher the depth is, the better the color gradations will be recorded. The color depth or bit depth shows how much information a scanner can capture in one pixel.

Select the one with the highest resolution. Be aware that the majority of scanners allow you to set the preferable DPI. Usually, it is considered that the higher the DPI number, the better the device. It is measured in DPI (dots per inch) and shows how many pixels a scanner can capture. The optical resolution is a very important characteristic of an OCR scanner. Concerning the data input machines, they perform great when it is necessary to scan repetitive data in a document and do some formatting.

The text input machines are mainly used for scanning the whole documents, as they can scan large packs of documents. All the OCR handheld scanners may be grouped into two categories: text input and data input.

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