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Date Posted: 07:23:56 03/30/00 Thu
Author: Michel
Subject: Re: Compressed Tiff
In reply to: Jeff Kelling 's message, "Compressed Tiff" on 16:10:41 03/29/00 Wed

Hi Jeff,

Unisys is serious about their LZW patent in the U.S. and Canada so I cannot include support for it in Envision. Their licensing is simply unreasonable for a shareware product (and I was told they do not license shareware products). If you really need tiff lzw support, the original libtiff library used by Envision, www.libtiff.org has support for it, so it is possible to add it, but you'll need to add the tlzw.c file as an include in the Envision.C file, and recompile the C source files with C++Builder4 preferably.

For TIFF Jpeg support, the most common variation is supported by Envision. I believe, the original Tiff/Jpeg specification has been revised and is obsolete. I think there are some files around in this original JPEG format, but Envision will not read them.

Best regards,


> Michel,
> We have purchased your graphics library and it is
> working well for us.
> The tiff code works fine, but we want to figure out
> how to make it support the jpeg compressed and lzw
> compressed Tiffs. Given that we have the source for
> TGifImage as well as your source code for jpeg, how
> can we get the tiff code to recognize tiff images with
> these compression types. Note, we mostly only care
> about decompression, but if compression is easy, that
> would be nice too.
> Thanks,
> Jeff

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