I have the original image (left image below) and have received the processed version (center image below) of that image. I don't know which processing steps have been applied on the original image to get the edited version. However, I know that all editing steps, e.g. change of saturation, have always been applied on the image as a whole. No cutting, copying within the image or modification of a part of the image have been performed. Now, in Gimp, the same resulting effect should be applied on other images. The processing steps actually do not need to be reconstructed. However, I don't know how to use the difference (right image below, calculated with blending modes) in order to derive the necessary processing from it.
How do I have to read, in Gimp, the difference between two images to derive from it the necessary processing procedures to go from the original to the edited version?