heya, it used to do the gamma in the olden days. now it just does what you observed: convert to uint8 for display and any marshalling of data at the end of the pipeline in gui mode can take place here. it's certainly not applying gamma. i suppose we could delete these old gamma lut table lines of code and just round directly in process().
cheers, jo On Thu, Nov 1, 2018 at 3:52 PM Aurélien Pierre <rese...@aurelienpierre.com> wrote: > > Hi, > > there is in dt an hidden IOP named gamma.c that is the last one in the > pixelpipe. Looking at the code, it is useful to display the masks and convert > the pixels to uint8 values. > > However, it does a gamma conversion too, with a linear and gamma parameters. > First of all, this conversion seems damaging in a calibrated and linear > workflow because it (seems to) prevents the color picker to get accurate > pixel values readings. > > Then, I don't see where the gamma and linear parameters are grabbed. Could > anyone tell me what it does and how ? Having an arbitrary gamma conversion > there could be redundant with the display gamma and is a serious matter for > color management. > > Thanks, > > Aurélien. > > > ___________________________________________________________________________ > darktable developer mailing list to unsubscribe send a mail to > darktable-dev+unsubscr...@lists.darktable.org ___________________________________________________________________________ darktable developer mailing list to unsubscribe send a mail to darktable-dev+unsubscr...@lists.darktable.org
