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Adobe Acrobat Help
Acrobat Distiller Options
Using Help
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Contents
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Index
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62
•
For Gray, choose a profile to define the color space of all grayscale images in files. This
option is available only if you chose Tag Everything for Color Management or Tag Only
Images For Color Management. The default ICC profile for gray images is Adobe Gray -
20% Dot Gain. You can also choose None to prevent grayscale images from being
converted.
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For RGB, choose a profile to define the color space of all RGB images in files.The default,
sRGB IEC61966-2.1, is generally a good choice because it is becoming an industry
standard and is recognized by many output devices. You can also choose None to
prevent RGB images from being converted.
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For CMYK, choose a profile to define the color space of all CMYK images in files. The
default is U.S. Web Coated (SWOP) v2. You can also choose None to prevent CMYK
images from being converted.
Note:
Choosing None for all three working spaces has the same effect as selecting the
option Leave Color Unchanged.
You can add ICC profiles (such as ones provided by your print service bureau) by
placing them in the ICCProfiles folder in the Common folder, the Windows/System/Color
folder (Windows), or the System Folder/ColorSync folder (Mac OS).
8
For device-Dependent Data, choose any of the following options (these settings are
typically used with documents created with high-end documentation and graphics appli-
cations such as Adobe Illustrator and Adobe PageMaker. For more information, see the
documentation that came with the application):
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Preserve Overprint Settings retains any overprint settings in files being converted to
PDF. Overprint colors are two or more inks printed on top of each other. For example,
when a cyan ink prints over a yellow ink, the resulting overprint is a green color.
Without overprinting, the underlying yellow would not be printed, resulting in a cyan
color.
•
Preserve Under Color Removal and Black Generation Settings retains these settings if
they exist in the PostScript file.
Black generation calculates the amount of black to be used when trying to reproduce a
particular color. Undercolor removal (UCR) reduces the amount of cyan, magenta, and
yellow components to compensate for the amount of black that was added by the black
generation. Because it uses less ink, UCR is generally used for newsprint and uncoated
stock.
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Preserve Transfer Functions retains the transfer functions traditionally used to
compensate for dot gain or dot loss that may occur when an image is transferred to
film. Dot gain occurs when the ink dots that make up a printed image are larger (for
example, due to spreading on paper) than in the halftone screen; dot loss occurs when
the dots print smaller. With this option, the transfer functions are kept as part of the file,
and are applied to the file when the file is output.
Transfer functions are used for artistic effect and to correct for the characteristics of a
specific output device. For example, a file that is intended for output on a particular
imagesetter may contain transfer functions that compensate for the dot gain inherent
with that printer.
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Apply Transfer Functions does not keep the transfer function, but applies it to the file,
changing the colors in the file. This is useful for creating color effects in a file.