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Topic: Acrobat compression?
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German Marin
Expert Film Handler
![](http://www.film-tech.com/ubbmembers/918c.jpg)
Posts: 227
From: Verbania (VB), Italy
Registered: Jul 2001
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posted 08-28-2002 10:15 PM
I've took this from the Adobe Acrobat 5 help:"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. 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 quality. However, using 4-bit ZIP compression with 8-bit data can affect the quality, since data is lost." (*)• The CCITT (International Coordinating Committee for Telephony and Telegraphy) compression method is appropriate for black-and-white images made by paint programs and any images scanned with an image depth of 1 bit. CCITT is a lossless method. (**)• Run Length is a lossless compression option that produces the best results for images that contain large areas of solid white or black.
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