2005.12.23 22:01 "[Tiff] problem reading Photoshop CS2 JPEG-in-TIFF", by
Dwight Kelly
Thread
2006.01.04 21:59 "Re: [Tiff] Re: Reading TIFF(CMYK)", by Kai-Uwe Behrmann
Am 04.01.06, 14:44 -0500 schrieb Dwight Kelly:
Arkadiusz Malka asked:
> it's possible to read only one color chanel from tiff(CMYK) let say cyan > and save it as greyscale?
All CMYK TIFF files should been PHOTOMETRIC_SEPARATED & SAMPLESPERPIXEL == 4.
I would not rely on the later. There are Cmyk images out with 1-bit, indexed 8-bit, 8-8-8-8 (as suggested in the spec) and 16-bit per sample, makes a variance of 4 to 64 bit per pixel. Sometimes colour planes are allready in separate files, which is what I expect will be the target of Arkadiusz.
Photoshop for instance writes 16-bit per sample Cmyk tiffs.
regards
Kai-Uwe Behrmann
+ development for color management
+ imaging / panoramas
+ email: ku.b@gmx.de
+ http://www.behrmann.name