I need help - I can help - Compression of images

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Compression of images

Printed From: Debenu Quick PDF Library - PDF SDK Community Forum
Category: For Users of the Library
Forum Name: I need help - I can help
Forum Description: Problems and solutions while programming with the Debenu Quick PDF Library and Debenu PDF Viewer SDK
URL: http://www.quickpdf.org/forum/forum_posts.asp?TID=1839
Printed Date: 04 Apr 26 at 8:04PM
Software Version: Web Wiz Forums 11.01 - http://www.webwizforums.com

Topic: Compression of images

Posted By: Flopy
Subject: Compression of images
Date Posted: 24 May 11 at 4:29PM

Do you support CCITT G4 or JBIG2 compression of added b/w images?

Except CompressImages method, which can set only flate encoding I have not found any other option.

Thank you.

Replies:

Posted By: Ingo
Date Posted: 24 May 11 at 9:50PM

Hi Flopy!

QuickPDF can work with the described compression types
but they can't be set by QuickPDF. Sorry.
BUT... this could be a hint for further development. You
should send it to the official support pages.

Cheers and welcome here,
Ingo

Posted By: AndrewC
Date Posted: 02 Jun 11 at 1:22PM

The 7.25 release of Quick PDF Library will import TIFF images and preserve the compression of the original files. So if you add a Group4 Tiff the the G4 data will be stored as with Group 4 compression.

This also works with Group 3 and LZW tiff images.

There us no support for JBIG2 importing at this stage.