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

• Is there anything in the specification that requires factorable sizes when using YCbCr images?

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