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61
Adobe Acrobat Help
Acrobat Distiller Options
Using Help
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61
and CMYK) are converted to device-independent color spaces (CalRGB, CalGray, and
LAB).
•
Tag (or Convert) Only Images for Color Management. With Acrobat 4.0 compatibility
selected in the General dialog box, the Tag Only Images for Color Management option
only embeds ICC profiles in images, not text or graphics, when distilling files. This
prevents black text from undergoing any color shift. With Acrobat 3.0 compatibility
selected, the Convert Only Images for Color Management option does not embed ICC
profiles in the files. However, device-dependent color spaces in images (RGB, Grayscale,
and CMYK) are converted to device-independent color spaces (CalRGB, CalGray, and
LAB). Text and graphics are not converted.
•
Convert All Colors to sRGB (or Convert Everything to CalRGB). As with the Tag (or
Convert) Everything for Color Management option, this option calibrates color in the
file, making the color device-independent. With Acrobat 4.0 or 5.0 compatibility
selected in the General dialog box, CMYK and RGB images are converted to sRGB. With
Acrobat 3.0 compatibility selected, CMYK and RGB images are converted to calibrated
RGB (CalRGB).
Regardless of the compatibility option you select, grayscale images are left unchanged.
This option usually reduces the size and increases the display speed of PDF files because
less information is needed to describe RGB images than CMYK images. Because RGB is the
native color space used on monitors, no color conversion is necessary during display,
which contributes to fast online viewing. This option is recommended if the PDF file will
be used online or with low-end printers.
6
Choose a method from the Intent menu to specify how to map colors between color
spaces. The result of any particular method depends on the profiles of the color spaces.
For example, some profiles produce identical results with different methods:
•
Default means that the intent is specified in the output device rather than in the PDF
file. In many output devices, Relative Colorimetric is the default intent.
•
Perceptual maintains the relative color values among the original pixels as they are
mapped to the destination gamut. This method preserves the visual relationship
between colors, although the color values themselves may change.
•
Saturation maintains the relative saturation values of the original pixels. This method is
suitable for business graphics, where the exact relationship between colors is not as
important as having bright saturated colors.
•
Relative Colorimetric remaps the white point of the source space to the white point of
the destination space.
•
Absolute Colorimetric disables the matching of white and black points when
converting colors. This method is not generally recommended unless you must
preserve signature colors such as those used in trademarks or logos.
Note:
In all cases intents may be ignored or overridden by color management operations
that occur subsequently to the creation of the PDF file.
7
For all Color Management Policies values other than Leave Color Unchanged, choose a
working space from the pop-up menu. These options let you choose which ICC profiles to
use for defining and calibrating the Grayscale, RGB, and CMYK color spaces in distilled PDF
files: