I took a look at:
https://youtu.be/ylIyA6wQGcY?si=IImHxA4w4hBsMPD2 (video), whose tutorial can be found at https://www.alexburkephoto.com/blog/2019...r-negative -film
Also in this other video
https://youtu.be/LXuwnt5ba8M?si=5KMVN9-Bl3byqOhT
But in these techniques (PS) there is a feature that I didn't understand well: when applying curves you use ALT+click, which doesn't work in Gimp.
So the best results I obtained were those that follow the approach mentioned by denzjos.
In the image below I used this approach followed by the use of G'MIC - Color Presets - PIXLS.US(31) - Whiter Whites (default)
https://youtu.be/ylIyA6wQGcY?si=IImHxA4w4hBsMPD2 (video), whose tutorial can be found at https://www.alexburkephoto.com/blog/2019...r-negative -film
Also in this other video
https://youtu.be/LXuwnt5ba8M?si=5KMVN9-Bl3byqOhT
But in these techniques (PS) there is a feature that I didn't understand well: when applying curves you use ALT+click, which doesn't work in Gimp.
So the best results I obtained were those that follow the approach mentioned by denzjos.
In the image below I used this approach followed by the use of G'MIC - Color Presets - PIXLS.US(31) - Whiter Whites (default)
.....
Samj Portable - Gimp 2.10.28 - Win-10 /64.
Samj Portable - Gimp 2.10.28 - Win-10 /64.