Adobe PHOTOSHOP 5.0 User Manual page 324

316 CHAPTER 14
Saving and Exporting Images
3 If you are saving to the DCS format, follow these
guidelines when choosing a DCS option:
The DCS 1.0 format creates five files: one for
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each color channel in the CMYK image and a fifth
master file corresponding to the composite
channel. You can choose to include a 72-ppi
grayscale or color version of the composite image
in the master file. By printing the low-resolution
composite from the destination application, you
can proof the image. If you plan to print directly to
film or want to reduce file size, choose No
Composite PostScript. To view the composite file,
you must keep all five files in the same folder
location.
The DCS 2.0 format retains spot channels and a
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single alpha channel in the image. You can choose
between saving color channel information as
multiple files (as for DCS 1.0) or as a single file.
The single-file option saves disk space. You can
also include a 72-ppi grayscale or color composite
with the image.
4 Specify an encoding method when printing to a
PostScript output device:
ASCII to use the most generic encoding method.
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Use ASCII encoding if you're printing from a
Windows system, or if you experience printing
errors or other difficulties.
Binary to use a faster encoding method that
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produces a smaller output file and leaves the
original data intact. Use Binary encoding if you're
printing from a Mac OS system. However, some
page-layout applications and some commercial
print spooling and network printing software may
not support binary Photoshop EPS files.
JPEG to use the fastest encoding method. JPEG
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encoding compresses the file by discarding some
image data, thus reducing the quality of your
printed output; for the best printed results, choose
maximum quality compression. Files with JPEG
encoding can be printed only on Level 2 (or later)
PostScript printers and may not separate into
individual plates.
Select Include Halftone Screen and Include
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Transfer Function to save the image's halftone
information (including the frequencies and angles
of the screens) and transfer function information.
The PostScript language interpreter in some appli-
cations can use these screen settings when color
separations are generated. You can also choose the
Override Printer's Default Functions option in the
Transfer Functions dialog box. (See "Compen-
sating for dot gain in film using transfer functions"
on page 95.)
To display white areas in the image as trans-
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parent, select Transparent Whites. This option is
available only for images in Bitmap mode.
If you are printing to a PostScript printer, select
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PostScript Color Management to instruct the
printer to convert the file data to the printer's
color. Select this option only if you have not
already converted the file to the printer's color
space.
Note: Only PostScript Level 3 printers support
PostScript Color Management for CMYK images.
To print a CMYK image using PostScript Color
Management on a Level 2 printer, convert the image
to Lab mode before saving in EPS format.