Epson ActionScanner II, User Manual

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Expression 636 Scanner Settings B-15
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Computer screens require lower resolutions than most
printers. If your scanned image will be viewed only on a
computer monitor or screen and will never be printed, you
can use lower scanning resolutions for top-quality work.
Remember that the scanner can read and save up to
16 million colors. If your computer can display only 16 or
256 colors, you will not be able to see all of the quality of the
scanned image.
File size
In grayscale and color, use the lowest resolution that gives
acceptable quality for your printing or display method, because
high resolutions mean large files. An A4 or letter-size full-color
scan at 300 dpi uses as much as 25 megabytes (MB) of disk space.
Large files use up your computer and hard disk memory; they
take longer to process, to print, or to transmit by modem; and
they are more difficult to save to a disk for sending to a service
bureau or printing company.
Many printing methods cannot use all of the information stored
in a high-resolution scan, so in these cases part of the
information is wasted.
Resolution guidelines
The table below shows the recommended resolutions in dots per
inch or pixels per inch for the image types and printing or
display methods just described. Also, you may want to
experiment with your scanner settings, possibly using a cropped
version of your image to save time, until you achieve the desired
results.