Adobe 22001438 - Acrobat - PC Using Manual page 51

Adobe Acrobat Help
Using Help | Contents
Applying compression and resampling
When converting files, you can have Distiller compress text and line art, and compress and
resample color, grayscale, and monochrome images. Depending on the settings you
choose, compression and resampling can significantly reduce the size of a PDF file with
little or no loss of detail and precision.
Line art, or vector graphics, is described with a mathematical equation; it is usually
•
created with a drawing program such as Adobe Illustrator®.
Images are described as pixels and are created with paint programs or from scanners.
•
Monochrome images include most black-and-white illustrations made by paint
programs and any images scanned with an image depth of 1 bit. Adobe Photoshop, for
example, works with images.
About methods of compression
Distiller applies ZIP compression to text and line art; ZIP or JPEG compression to color and
grayscale images; and ZIP, CCITT Group 3 or 4, or Run Length compression to
monochrome images.
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Suitable compression methods for different source art types
A. ZIP B. JPEG C. CCITT D. Run Length
ZIP is a compression method that works well on images with large areas of single colors
•
or repeating patterns, such as screen shots and simple images created with paint
programs, and for black-and-white images that contain repeating patterns. Acrobat
provides 4-bit and 8-bit ZIP compression options. If you use 4-bit ZIP compression with
4-bit images, or 8-bit ZIP with 4-bit or 8-bit images, the ZIP method is lossless, which
means it does not remove data to reduce file size and so does not affect an image's
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HOT AIR BALLOON
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to EUREKA
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D
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Acrobat Distiller Options
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