+ if (is_yuv){
+ /** according to CCIR Recommendation 601.1 */
+ uint32_t refbw[12] = {15, 1, 235, 1, 128, 1, 240, 1, 128, 1, 240, 1};
+ add_entry(s, TIFF_YCBCR_SUBSAMPLING, TIFF_SHORT, 2, s->subsampling);
+ add_entry(s, TIFF_REFERENCE_BW, TIFF_RATIONAL, 6, refbw);
+ }