Epson ES-300C User Manual - TWAIN 32 - Page 34

dpi output., For printing on a commercial printing press, multiply

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Optimum scanning resolutions Output device Monochrome printer Desktop or off ice color printer Printing press or imagesetter line art 300-600 300-720 600-1200 Grayscale 80-x170 150-240 150-350 Color - 150-240 150-350 The higher the resolution you select, the larger the resulting image file. For example, an 8.5 x 11 photograph scanned at 300 dpi can produce a 24MB file. The same photograph scanned at 72 dpi creates a file of only 1.36MB. Large files take longer to process and print, so consider the limitations of your computer and hard disk drive when you select a resolution. To keep file sizes manageable, select the lowest possible resolution that gives acceptable quality. Tip: As a rule of thumb for any image except line art, use scanning resolutions that are one third of your output resolution. For example, use a scanning resolution of up to 110 with a 300 dpi laser printer and up to 170 with a 600 dpi laser printer. For the color EPSON Stylus printers, choose a resolution from 100 to 240 dpi for 720 dpi output and from 100 to 150 dpi for 360 dpi output. Tip: For printing on a commercial printing press, multiply the lines per inch (lpi) the press prints by 2 to determine your scanning resolution. For example, if your lpi is 150, try scanning at 300 dpi. (if the file size is too large, multiply the lpi by 1.5 to determine the scanning resolution.) Tip: If you plan to enlarge an image when you print it, scan it at a higher resolution than you normally would. Capturing Images From Within Applications 3-11

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Optimum scanning resolutions
Output device
Monochrome
printer
line art
Grayscale
Color
300-600
80-x170
-
Desktop or off ice
color printer
Printing press or
imagesetter
300-720
150-240
150-240
600-1200
150-350
150-350
The higher the resolution you select, the larger the resulting
image file. For example, an 8.5 x 11 photograph scanned at
300 dpi can produce a 24MB file. The same photograph
scanned at 72 dpi creates a file of only 1.36MB. Large files take
longer to process and print, so consider the limitations of your
computer and hard disk drive when you select a resolution. To
keep file sizes manageable, select the lowest possible resolution
that gives acceptable quality.
Tip:
As a rule of thumb for any image except line art, use scanning
resolutions that are one third of your output resolution. For
example, use
a scanning resolution
of
up
to
110 with a 300 dpi
laser printer and up to 170 with a 600 dpi laser printer. For
the color EPSON Stylus printers, choose a resolution from
100 to 240 dpi
for
720 dpi output and from 100 to 150 dpi for
360 dpi output.
Tip:
For printing on a commercial printing press, multiply the
lines per inch (lpi) the press prints by 2 to determine your
scanning resolution. For example, if your lpi is 150, try
scanning at 300 dpi.
(if the file size is too
large,
multiply the
lpi by 1.5 to determine the scanning resolution.)
Tip:
If you plan to enlarge an image when you print it, scan it at a
higher resolution than you
normally
would.
Capturing Images From Within Applications
3-11