Operation Manual

330
USING ACROBAT X STANDARD
Color management
Last updated 10/11/2011
In either case, the application uses a color management policy to decide how to handle the color data in the document.
If the profile is missing or does not match the working space, the application may display a warning message,
depending on options you set in the Color Settings dialog box. Profile warnings are turned off by default, but you can
turn them on to ensure the appropriate color management of documents on a case-by-case basis. The warning
messages vary between applications, but in general you have the following options:
• (Recommended) Leave the document or imported color data as it is. For example, you can choose to use the
embedded profile (if one exists), leave the document without a color profile (if one doesn’t exist), or preserve the
numbers in pasted color data.
• Adjust the document or imported color data. For example, when opening a document with a missing color profile,
you can choose to assign the current working space profile or a different profile. When opening a document with
a mismatched color profile, you can choose to discard the profile or convert the colors to the current working space.
When importing color data, you can choose to convert the colors to the current working space in order to preserve
their appearance.
Color conversion options
Color conversion options let you control how the application handles the colors in a document as it moves from one
color space to another. Changing these options is recommended only if you are knowledgeable about color
management and very confident about the changes you make. To display conversion options, select the Color
Management category of the Preferences dialog box.
Engine Specifies the Color Management Module (CMM) used to map the gamut of one color space to the gamut of
another. For most users, the default Adobe (ACE) engine fulfills all conversion needs.
To view a description of an engine or intent option, select the option and then position the pointer over the option
name. The description appears at the bottom of the dialog box.
Use Black Point Compensation Ensures that the shadow detail in the image is preserved by simulating the full dynamic
range of the output device. Select this option if you plan to use black point compensation when printing (which is
recommended in most situations).
About rendering intents
A rendering intent determines how a color management system handles color conversion from one color space to
another. Different rendering intents use different rules to determine how the source colors are adjusted; for example,
colors that fall inside the destination gamut may remain unchanged, or they may be adjusted to preserve the original
range of visual relationships when translated to a smaller destination gamut. The result of choosing a rendering intent
depends on the graphical content of documents and on the profiles used to specify color spaces. Some profiles produce
identical results for different rendering intents.
In general, it is best to use the default rendering intent for the selected color setting, which has been tested by Adobe
Systems to meet industry standards. For example, if you choose a color setting for North America or Europe, the
default rendering intent is Relative Colorimetric. If you choose a color setting for Japan, the default rendering intent is
Perceptual.
You can select a rendering intent when you set color conversion options for the color management system, soft-proof
colors, and print artwork:
Perceptual Aims to preserve the visual relationship between colors so it’s perceived as natural to the human eye, even
though the color values themselves may change. This intent is suitable for photographic images with lots of out-of-
gamut colors. This is the standard rendering intent for the Japanese printing industry.