For 0.61:
TIFF improvements (to be detailed) (#20329)
+ - read/write 16-bit RGB w/ and w/o alpha
+ - read 16-bit RGB w/ and w/o alpha
+ - read/write 32-bit CMYK w/ and w/o alpha
+ - read 32-bit CMYK w/ and w/o alpha
+ - write mono images as bi-level
+ - read bi-level image as mono/paletted
+ - read/write 16/32 grayscale w/ and w/o alpha
+both contig and non-contiguous
+ - possible extra code for handling 8-bit CMYK (#29353)
regmach.c fixes/tests (#29296)