Black & white filters
I'm new on gimp. I'm wondering if it is possible to simulate the
optical filters used in b&w photography (red, yellow, orange...). I
know that's possible to slide the RGB cursor in Mono Mixer to mimic
the filter's effect, but I'd like to know if it possible to define the
exact curves of the filters as in the picture here
and then apply them to the photos.
(please forgive my english, it's not my mothertongue...)
Gimp is a RGB editor and as far as I understand there is no way of directly creating filter transmission curves such as G (Orange), X0 (Yellow/green) directly.
If you have a "without filter" image and the same image "with filter" then a look-up-table LUT can be made using the Gimp plugin gimp_gmic_qt www.gmic.eu That LUT is then applied to other images.
The best place to ask this question is https://discuss.pixls.us/