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Lesson 4. Customizing Adobe PDF Output Q... > About compression and resampling

About compression and resampling

Distiller lets you choose from a variety of file compression methods designed to reduce the file space used by color, grayscale, and monochrome images in your document. Which method you choose depends on the kind of images you are compressing.

In addition to choosing a compression method, you can resample bitmap images in your file to reduce the file size. A bitmap image consists of digital units called pixels, whose total number determines the file size. When you resample a bitmap image using Distiller, the information represented by several pixels in the image is combined to make a single larger pixel. This process is also called downsampling because it reduces the number of pixels in the image.

Managing color with Distiller

Distiller 5.0 gathers color management controls in a single Color Settings dialog box.

When you use Distiller to convert a PostScript file to Adobe PDF, you can choose to use the color management information contained in the PostScript file or you can choose to change aspects of that color management information. If you choose to modify any color management information in the PostScript file, you do so through the Color tab in the Distiller job options dialog box.

Note

In Acrobat, color is managed through the Color Management preferences (in the General Preferences dialog box).


Specifying how color is managed

To specify whether Distiller uses color management information contained in the PostScript file or CSFs defined in the Color tab of the Distiller job options dialog box, do one of the following:

  • To use information contained in the PostScript file to manage color, choose None in the Settings File pop-up menu. Set the color management policy and working spaces to determine how Distiller converts or tags unmanaged color spaces in the PostScript file.The options other than the Setting File options vary with the compatibility option selected in the General tab. (The default Settings File value for the eBook, Press, Print, and Screen job options is None; settings for the related color management policies, working spaces, and device-dependent data are defined for each of the default job options settings.)

  • To use a Distiller color settings file to manage color, choose the required CSF from the Settings File pop-up menu. The Color Management Policies and Working Spaces options are grayed out because they are predefined for each CSF. Set the device-dependent data options as required.

––From the Acrobat 5.0 online Help.


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