For Dummies Photoshop CS5 All-in-One 978-0-470-60821-0 用户手册
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Getting the Right Resolution, Mode, and Format
Table 1-1
Recommended Resolutions and Image Modes
Device
Notes
Recommended
Resolution
Resolution
Mode
Fuji Frontier
photo printer
photo printer
Wallets to 10 x 15
inches. Great for print-
ing digital photos.
inches. Great for print-
ing digital photos.
300 dpi
RGB
Online photo
printers, such
as Shutterfly
printers, such
as Shutterfly
Check recommended
size and resolution set-
tings on the vendor’s
Web site.
size and resolution set-
tings on the vendor’s
Web site.
1024 x 768 for 4-x-6
print; minimum of 1600
x 1200 for 8-x-10 print
print; minimum of 1600
x 1200 for 8-x-10 print
RGB
Digital
presses
presses
Brands include Xeikon,
Xerox, IBM, Indigo*,
Scitex, Heidelberg,
and so on.
Xerox, IBM, Indigo*,
Scitex, Heidelberg,
and so on.
255 to 300 dpi
CMYK
Epson color
inkjets
inkjets
Resolutions depend on
the print setting. Epson
recommends
the print setting. Epson
recommends
1
⁄
3
of the
horizontal resolution,
but do test prints; set-
tings may be higher
than you need.
but do test prints; set-
tings may be higher
than you need.
720 dpi
×
1
⁄
3
= 240 dpi;
1440 dpi
×
1
⁄
3
= 480 dpi;
2880 dpi
×
1
⁄
3
= 960 dpi
RGB
Color
separations
separations
Film separations or
direct to plate for offset
printing.
direct to plate for offset
printing.
2
× lines per inch (lpi);
2
× 133 lpi = 266 dpi;
2
× 150 lpi = 300 dpi;
2
× 175 lpi = 350 dpi**
CMYK
and spot
colors
and spot
colors
Laser printers
Color or B&W printouts.
2 x lpi = 170 dpi
Grayscale
or RGB
or RGB
*Indigo presses can handle a fifth spot color, if necessary.
**See the section “Screen frequencies,” in this chapter.
**See the section “Screen frequencies,” in this chapter.
Screen frequencies
For the recommended resolution for color separations in Table 1-1, I list 2
multiplied by the number of lines per inch. The lines per inch, or lpi, per-
tains to the screen frequency of the output device. Screen frequencies are
measured in lines per inch in a halftone screen. You may also hear the terms
screen ruling or line screen. When images are printed, they’re converted into
a series of dots called halftones. When you print your halftone, you print it
by using a halftone screen of a certain value. The average screen frequency
for printing four-color images is 133 to 175 lpi. Therefore, when you multiply
that number by 2, you need to create your images by using a resolution set-
ting of 266 to 350 dots per inch (dpi).
multiplied by the number of lines per inch. The lines per inch, or lpi, per-
tains to the screen frequency of the output device. Screen frequencies are
measured in lines per inch in a halftone screen. You may also hear the terms
screen ruling or line screen. When images are printed, they’re converted into
a series of dots called halftones. When you print your halftone, you print it
by using a halftone screen of a certain value. The average screen frequency
for printing four-color images is 133 to 175 lpi. Therefore, when you multiply
that number by 2, you need to create your images by using a resolution set-
ting of 266 to 350 dots per inch (dpi).
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