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May 2005
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2005.05.26 12:24 "Re: Jpeg and YCbCr", by Jean-yves Le Ridant
> I really misunderstood the word "comment" & "uncomment":(..., > and thus brings me a lot of messy things...:((((-. > > I did what you real said, and it works.(then what does that bug > of TIFFWriteScanline()..means ???). Hum ..., you can try to fix the bug of TIFFScanlineSize, and test with some libtiff clients on various platforms ...... :-) > with bitcount=24 image, i did like this.. > but with grayscale image(bitcount= 8) If you want the widest standard for your jpeg stream, compress as RGB/YCBCR 24 bits is better. Tiff allows a one component photometric minisblack ( with a unknown colorspace for jpeg stream ). > some may have palette, If you mean "gray reponse curve", such a gamma, it's legal, but result might be very poor. > some may not [just like color image]) > should i shift the grayscale image data to RGB mode ? Jpeg compression of palette color indexes would be as strange idea as jpeg compression of CIELAB. And it is out of spec. -- Jean-Yves