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Adobe Acrobat Help
Managing Color in Acrobat
Using Help
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236
Emulate Photoshop 4
Emulates the color workflow used by the Mac OS version of
Adobe Photoshop 4.0 and earlier.
Photoshop 5 Default Spaces
The default color settings in Photoshop 5.0
The values for the color management engine and the RGB, CMYK, and Grayscale working
spaces vary with the Settings value. If you edit any of these settings, your Settings
selection reverts to Custom.
Note:
These settings apply to any color spaces in a PDF file that are not color managed,
and they remain in effect until you change them again. Acrobat uses the profiles and color
management system information from the color settings file to convert only unmanaged
color in the document for display and printing.
Specifying working spaces for unmanaged colors
In a color-managed workflow, each color mode must have a working space profile
associated with it. Acrobat ships with a standard set of CMYK, RGB, and Grayscale profiles
that have been recommended and tested by Adobe Systems for most color management
workflows. By default, only these profiles appear in the working space menus. Note the
following for Grayscale working space profiles:
•
You can specify a Grayscale working space profile that is based on the characteristics of
a particular dot gain.
Dot gain
occurs when a printer’s halftone dots change as the ink
spreads and is absorbed by paper. Dot gain is the amount by which the expected dot
increases or decreases. For example, a 50% halftone screen may produce an actual
density of 60% on the printed page, exhibiting a dot gain of 10%. The Dot Gain 10%
option represents the color space that reflects the grayscale characteristics of this
particular dot gain.
Proof (no dot gain), and printed image (with dot gain)
•
You can also specify a Grayscale working space profile that is based on the character-
istics of a particular gamma. A monitor’s
gamma
setting determines the brightness of
midtones displayed by the monitor. Gray Gamma 1.8 matches the default grayscale
display of Mac OS computers and is also the default grayscale space for Photoshop 4.0
and earlier. Gray Gamma 2.2 matches the default grayscale display of Windows
computers.
Specifying a color management engine
The color management engine specifies the system and color-matching method used to
convert colors between color spaces. Acrobat uses industry-standard color management
engines:
•
Adobe (ACE), which uses the Adobe color management system and color engine.This is
the default setting for most preset color configurations.