Hi Bill, I don't know of plugins that would calculate a matrix in GIMP. There's a plugin called GetCurves by Elsamuko [1] that calculates a rough approximation of a color transform between two layers and creates an RGB curves preset. Due to its nature, the plugin has obvious issues treating different hue ranges differently [2] but maybe it's a motivation for someone to come up with a better tool. Although I'd be damned if I knew how you would then apply a generated 3x3 matrix to a different image :) I recently looked at free/libre options to create 3D LUT files, and the existing options like Harlequin [3] are not very encouraging yet. [1] https://github.com/elsamuko/gimp-elsamuko/tree/master/plugins/elsamuko-get-curves [2] https://twitter.com/lgworld/status/1338597821881192448 [3] https://github.com/dunkyp/harlequin/ Alex On Sun, Dec 27, 2020 at 2:47 PM Bill Ross via gimp-developer-list <gimp-developer-list@xxxxxxxxx> wrote: > > Given a pair of before/after jpeg photos edited with global-effect > commands (vs. operations on selected areas), is it possible to derive > transformation matrix/matrices that reproduce the result from the > original? Presumably by iterating over all the pixels in a 1:1 mapping. > > My hope is to train neural nets to predict the matrix operation(s) > required. Example: > > http://phobrain.com/pr/home/gallery/pair_vert_manual_9_2845x2.jpg > > Thanks, > > Bill > > > -- > Phobrain.com > _______________________________________________ > gimp-developer-list mailing list > List address: gimp-developer-list@xxxxxxxxx > List membership: https://mail.gnome.org/mailman/listinfo/gimp-developer-list > List archives: https://mail.gnome.org/archives/gimp-developer-list _______________________________________________ gimp-developer-list mailing list List address: gimp-developer-list@xxxxxxxxx List membership: https://mail.gnome.org/mailman/listinfo/gimp-developer-list List archives: https://mail.gnome.org/archives/gimp-developer-list
