2022.04.27 12:05 "Re: [Tiff] questions about LAB encoded TIFF", by John

Hello Sylvian,

1. : I want to know with libtiff the LAB encodage of the TIFF ie CIELAB, ICCLab ou JPEG Fax

It's D65 CIELAB.

2. : I want to know the bits number per LAB channel by libtiff
3. : I want to get the RAW LAB channels values of a pixel with libtiff

It's usually 8 or 16 bits unsigned, with L 0 - 100 and ab +/- 128 all scaled to 0 - 255 or 0 - 65535 in the obvious way.

John