up 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 15:21, Sylvain Ard <[email protected]> a écrit : > Thank you all ! The encoding is not always D65 CieLab so how to know Lab > encoding please ? > > Envoyé de mon iPhone > > > Le 27 avr. 2022 à 14:51, [email protected] a écrit : > > > > 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 >
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