Epson ES-800C, User Manual

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2. Multiply the lines per inch by two to find the best scanning
resolution. For example, for 133 lines per inch (a common
resolution for magazines and books), scan your image at
266 dpi (2 x 133 = 266).
Tip: For even smaller file sizes, try scanning at about 1.5 times the
lines per inch. This may cause little or no perceptible loss of
output quality.
Note:
For
color or gray scale images, ignore the dpi (dots per inch)
resolution of your printing device. Even though your service bureau
may use an imagesetter with a 2400 dpi resolution, a scan resolution
of only 150 to 250 dpi will produce the highest quality gray-scale or
color images the imagesetter can print. Similarly, even though your
laser printer may have a 300 dpi resolution, it requires a scan
resolution of only 75 to 100 dpi to obtain the best quality gray scale
images it cm print.
Size or scale
This is usually expressed as a percentage. If you want your
printed image to be larger than the original, increase its size
with this setting. If you are not sure how large you want the
printed image, choose the largest size you might use. You can
reduce the image size later with your software. (You can also
increase the size with your software, but you may lose some
quality.)
Note:
The size of the image on your monitor will probably be different from
the size of the image when you print it.
Scanner Basics 3-11