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TIFF and LibTiff Mail List Archive

Thread

2006.01.04 18:15 "[Tiff] Reading TIFF(CMYK)", by
2006.01.04 18:39 "Re: [Tiff] Reading TIFF(CMYK)", by Bob Friesenhahn
2006.01.04 18:50 "Re: [Tiff] Reading TIFF(CMYK)", by
2006.01.04 19:34 "RE: [Tiff] Reading TIFF(CMYK)", by
2006.01.04 19:41 "Re: [Tiff] Reading TIFF(CMYK)", by Bob Friesenhahn
2006.01.04 19:45 "Re: [Tiff] Reading TIFF(CMYK)", by Kai-Uwe Behrmann
2006.01.06 14:48 "[Tiff] LZW", by Rocky Pulley
2006.01.06 14:55 "Re: [Tiff] LZW", by Chris Losinger
2006.01.06 15:14 "RE: [Tiff] LZW", by Steve Eddins
2006.01.06 19:22 "[Tiff] configuring LZW in libtiff 3.7.2", by monee singh
2006.01.07 01:11 "Re: [Tiff] LZW in libtiff 3.7.2", by Bob Friesenhahn
2006.01.04 18:51 "Re: [Tiff] Reading TIFF(CMYK)", by Kai-Uwe Behrmann

2006.01.04 19:41 "Re: [Tiff] Reading TIFF(CMYK)", by Bob Friesenhahn

On Wed, 4 Jan 2006 a.malka@comptel.pl wrote:

So maybe i ask another way...

i read tiff specification and can't find in which tag are saved CMYK channel...

Image channels are not saved in tags. They are part of the core image data which is interpreted (e.g. photometric, bits-per-sample, extra-samples) though use of tags.

There are several ways that CMYK data can be stored. The image may be comprised of strips or tiles. It may be arranged so that CMYK samples are stored contiguously, or they may be arranged as separate planes so that each plane is a channel (e.g. 'M').

If you are planning to write a program do to this directly via libtiff then expect to do a lot of research and looking at sample code.

Bob
======================================
Bob Friesenhahn
bfriesen@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/