JBIG2 compression

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evdbogaard
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JBIG2 compression

Post by evdbogaard » Tue Sep 01, 2009 7:56 pm

Is there any explanation available for the options for JBIG2 compression (Standard, Crop Borders and Symbols)? The help-file doesn't contain any (unless I am looking at the wrong place in it).

Kind regards,
Ed

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Tracker Supp-Stefan
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Re: JBIG2 compression

Post by Tracker Supp-Stefan » Wed Sep 02, 2009 4:18 pm

Hi Ed,

You are right there is no explanation in the help files about those settings as they are originating from the way JBIG2 works, so allow me to try and explain them here:

Standard - image is compressed using only the generic JBIG region

Crop Borders - we are locating any white borders on an image and excluding them from the compression

and Symbols is our implementation of a method similar to the ones described in the "Text image data" section of this wiki article.

Regards,
Stefan

evdbogaard
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Re: JBIG2 compression

Post by evdbogaard » Thu Sep 03, 2009 8:58 am

Hi Stefan,

Thanks for the prompt response. How does this compare with lossy and lossless compression, which are options in Acrobat (Pro 8)?

Ed

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Re: JBIG2 compression

Post by Tracker Supp-Stefan » Fri Sep 04, 2009 8:07 am

Hi Ed,

All of the above are using lossless algorithms.

Regards,
Stefan

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