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Topic: More control over 'Adaptive Compression'?
Conf: (P-PDF) Acrobat 6.0, Msg: 98578
From: meswartz
Date: 10/17/2003 05:49 AM

I'm using the Adaptive Compression part of Acrobat 6's "PDF Optimizer" to compress some documents that originated as TIF scans. I have noted two specific problems so far, and I'm wondering if anybody else has seen similar behavior and found solutions.

1) Some of the scanned pages contain halftone or grayscale photographs. In some cases these photographs have light (outdoor sky) backgrounds, and the optimization is too aggressive: it washes these light backgrounds out to white. I have the compression slider set completely to the "Higher Quality" end of the range. (I'd expect a stronger washout if I was asking for -LOW- quality and higher compression.) Are there any (perhaps undocumented) ways to adjust Adaptive Compression settings, other than the two simple choices we have so far? (Checkbox for black border removal, and slider for quality.)

2) Some of the un-optimized PDFs I feed into Adaptive Compression were converted from TIFs by Abbyy FineReader. In some cases the photos have strong diagonal elements, and Adaptve Compression twists the whole page to make those diagonals "horizontal". If I use Acrobat 6 to convert the page from the same original TIF, this does not happen. I'm glad to have a way to get around the problem, but again find myself wishing for deeper insight (and better control of) the Adaptive Compression process.