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2000.10.14 22:15 "tif_getimage.c and YCbCr", by Frank Warmerdam
2000.10.14 23:31 "Re: tif_getimage.c and YCbCr", by Tom Lane
2000.10.16 09:17 "Re: tif_getimage.c and YCbCr", by Rick LaMont

2000.10.14 23:31 "Re: tif_getimage.c and YCbCr", by Tom Lane

Yes, see the description of file YCbCrSubsampling (p. 92 in my copy of TIFF 6.0).

This restriction is pretty bogus in connection with JPEG-compressed images, since an odd-sized original might be converted to YCbCr as part of compression. But it's reasonable for images that are natively YCbCr.

regards, tom lane