Compression

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Compression


 

Main-Image Compression

 


 

The Compression settings determine compression parameters:

 

compression.compression-options

Figure 1. Compression Settings Dialog Box

 

The General settings determine compression values for specific document elements:

 

Select the Compress Graphics box to compress document graphics. When this box is selected the options for High Color/Grayscale Images, Indexed Images and Monochrome Images are enabled. See below for further information.

Select the ASCII format (Larger File) box to use only ASCII 7-bit symbols in the creation of files.

Select the Compress Text box to compress document text.

 

The High Colour/Grayscale Images settings determine compression options for images of these formats. Select the Compress Using box to determine how High Colour/Grayscale Images are compressed:

 

Auto - PDF-XChange Standard selects optimal compression options.

JPEG - the best form of compression for colored images.

Flate - an algorithm-based form of lossless data compression.

JPEG/ZIP - standard lossless compression that utilizes (*.zip) files.

JPEG 2000 - an improved version of JPEG/ZIP that includes the option of lossy compression.

JPEG 2000/ZIP - a combination of JPEG 2000 and JPEG/ZIP compression.

 

Use the JPEG Quality number box to determine JPEG Quality. This value is defined as the image content quality divided by the compression. Higher values result in a reduced level of compression but improved final image quality and vice versa.

 

Indexed Images

 

Select the Compress Using box to determine the compression mode for indexed images:

 

Auto - PDF-XChange Standard will select the best available compression options while retaining image quality as far as possible.

Run Length - simple lossless compression.

Flate - an algorithm-based form of lossless data compression.

LZW - compression via table-based lookup algorithm.

 

Monochrome Images

 

Select the Compress Using box to determine the compression for monochrome images:

 

Auto - PDF-XChange Standard will select the best available compression options while retaining image quality as far as possible. Select a JBIG2 Method as desired.

Flate - an algorithm-based form of lossless data compression.

CCITT Group 3 - a lossless form of data compression for bi-level images such as grayscale.

CCITT Group 4 - an improved version of CCITT Group 3 compression that removes EOL (end of line) codes.

Run Length - a simple form of lossless data compression.

JBIG2 - a form of compression for bi-level images that supports both lossy and lossless compression. Select a JBIG2 Method as desired.

 

Click Apply to apply changes and OK to save changes.