Choosing The Scan Resolution - Epson Expression 800 User Manual

Basic Scanning

Choosing the Scan Resolution

Resolution refers to how many dots per inch (dpi) or dots per centimeter
(dpcm) you want your scanned image to contain. These sections tell you
how to select the best resolution for your image:
Factors to Consider in Selecting Resolution
Changing the Resolution
Factors to Consider in Selecting Resolution
The best resolution for a scanned image depends on the type of image
you're scanning and your final output device. The higher a resolution you
select, the larger the resulting image file. For example, an 8.5
original scanned at 300 dpi can produce a 24MB file. The same original
scanned at 72 dpi creates only a 1.3MB file. If your scanned image is
intended only for on-screen viewing, you can scan at 72 dpi to reduce
your file size.
Large files take longer to process and print, so consider the practical
limitations of your computer system and hard disk drive when selecting a
resolution. To keep your file size manageable, select the lowest possible
resolution that gives acceptable quality.
As a rule of thumb for any image except line art, use a scanning
resolution that is approximately one third of your output resolution. For
example, use a scanning resolution up to 100 dpi with a 300 dpi laser
printer, and up to 200 dpi with a 600 dpi laser printer.
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