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January 2005
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2005.01.20 23:41 "Re: JPEG (T.30-E, fax) in TIFF", by Lee Howard
On about line 634 of libtiff/tif_jpeg.c (3.7.1 release) it says:
sp->photometric = td->td_photometric;
switch (sp->photometric) {
case PHOTOMETRIC_YCBCR:
sp->h_sampling = td->td_ycbcrsubsampling[0];
sp->v_sampling = td->td_ycbcrsubsampling[1];
break;
default:
/* TIFF 6.0 forbids subsampling of all other color
spaces */
sp->h_sampling = 1;
sp->v_sampling = 1;
break;
}
Is that true? It seems to contradict what we've discussed in this
thread. Does the TIFF spec really forbid subsampling of all color
spaces other than YCBCR photometric?
Lee.