Epson ES-300C User Setup Information - What You Should Know Before Scanning - Page 8

on this press, you multiply the lines per inch

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200 6@/133 line screen 600 dpi/133 line screen You'll also notice that if you scan a color image at 600 dpi, the printed result is not much different from what it is if you scan the same image at 200 dpi, because all printers and printing presses reproduce the image as a series of dots and have their own maximum resolution. Here are two images, one scanned at 200 dpi, one at 600 dpi, output on the same device. Can you tell the difference? An easy way to determine the best resolution for your intended output is to find out the lines per inch (lpi) capability of your printer and multiply it by 1.5. For example, a typical magazine printing press prints at 133 lines per inch. To tailor your scanned image for the best possible results on this press, you multiply the lines per inch (133) by 1.5: 133 x 1.5 = 199.5 In this example, the resulting number (200) is the optimum resolution for the scan. (If you regularly use a service bureau to print your scanned materials, you can also ask the printer for the lpi of his particular printing press and to suggest resolutions.)

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200
6@/133
line screen
600
dpi/133
line screen
You’ll also notice that if you scan a color image at
600 dpi, the printed result is not much different
from what it is if you scan the same image at 200
dpi, because all printers and printing presses
reproduce the image as a series of dots and have
their own maximum resolution.
Here are two images, one scanned at 200 dpi, one
at 600 dpi, output on the same device. Can you tell
the difference?
An easy way to determine the best resolution for
your intended output is to find out the lines per
inch (lpi) capability of your printer and multiply
it by 1.5. For example, a typical magazine printing
press prints at 133 lines per inch. To tailor your
scanned image for the best possible results
on this press, you multiply the lines per inch
(133) by 1.5:
133 x 1.5 = 199.5
In this example, the resulting number (200) is the
optimum resolution for the scan. (If you regularly
use a service bureau to print your scanned materials,
you can also ask the printer for the lpi of his
particular printing press and to suggest resolutions.)