Just check bitspersample. You can fetch the decoded pixels from the file in the usual way, for example with TIFFReadScanline().
On Wed, 27 Apr 2022 at 13:07, Sylvain Ard <[email protected]> wrote: > > OK thank you and for retrieving the RAW values of the channels and how to > know if the ranges are 0 - 255 or 0 - 65535 please ? > Sylvain Ard > 0549507724 > 0778380991 > [email protected] > http://sylvain-ard.fr > Entreprise individuelle SIRET : 80079243400022 > Appt 26 Bât A Résidence Le Patio > 83 rue de la Bugellerie > 86000 Poitiers > > > Le mer. 27 avr. 2022 à 14:05, <[email protected]> a écrit : >> >> Hello Sylvian, >> >> > Le sam. 23 avr. 2022 à 21:59, Sylvain Ard <[email protected]> a écrit : >> >> 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 _______________________________________________ Tiff mailing list [email protected] https://lists.osgeo.org/mailman/listinfo/tiff
