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While any document scanner performs the same basic function, there are some that are designed for a specific document formats while others can accommodate a wider variety of formats. There are even document scanners that are intended primarily for business cards. An important factor to take into consideration when shopping for a document scanner is its image resolution, A document scanner that offers a resolution of 600dpi or less should be adequate for basic document and image filing. For most uses that don't require too much detail, this resolution is generally more than enough. In some cases, you will need a document scanner with a much higher resolution.