Thanks Alexandre!
I figured I'd most likely be writing the code if the math is possible -
it would start as a standalone batch prog that could be appified. But
I'd need an obvious path to even start, since I'm more of a
jack-of-all-trades programmer, e.g. not sure how close LUTs could come.
I realized it would be capable of reverse engineering any global
filters, so could irk anyone who makes money from them.
Here's where I tried the question earlier:
https://www.reddit.com/r/computervision/comments/kktdq4/derive_transformation_matrix_from_two_photos/
My current editing backlog is 150K photos.
Bill
On 12/27/20 4:06 AM, Alexandre Prokoudine via gimp-developer-list wrote:
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
--
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
