2006.03.13 16:35 "[Tiff] CCITT Group 4 images", by Philip Watkinson

2006.03.13 16:19 "Re: [Tiff] CCITT Group 4 images", by Joris Van Damme


I have CCITT Group 4 compressed images that are not contained within TIFF files. Can I use Libtiff to decompress the images?

It is possible, but it is not easy.

You can redefine the LibTiff IO routines. Thus, you can make 'm such that they 'read' a fake valid TIFF file header, a fake valid TIFF IFD, and your real CCITT group 4 data, all combined into a valid TIFF. LibTiff's output then is the decompressed data.

Similar techniques are used in the tiff2pdf contribution.

Joris Van Damme
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