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May 2005
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2005.05.25 10:41 "Re: Jpeg and YCbCr", by Jean-yves Le Ridant
> I want to write a bitcount = 24bit(or 8bit) image to a tif file with JPEG > compression. I can save it with photometric = PHOTOMETRIC_RGB,but when i save it > with PHOTOMETRIC_YCBCR it seems doesn't work, why ? > It seems that i should do some operations on the RGB source image before i save > it with PHOTOMECTRIC_YCBCR ? This operations are done by libtiff if you uncomment TIFFSetField(m_tif, TIFFTAG_JPEGCOLORMODE, JPEGCOLORMODE_RGB); in the program you have posted. Best would be to have a tiffinfo of tiffdump of the file that acdsee don't want to open. -- Jean-Yves