I am working with GIMP 2.10.4 and G’MIC 2.4 on Windows 10 - 64 bit.
My goal is to blend two images together but, before doing so, I want to transfer the colors from one image (source) to another “similar” image (my target).
I have read there are many G’mic filter to try to do so.
In the end, I have opted for the transfers color advanced filter  even though I am not 100% sure it is the correct one to pick…
I have applied this filter to several images taken with a Leica camera mounted on a microscope (Orthoplan Leitz). All images concern nematodes (that is, little “worms”).
In short, this filter does not produce any result with my microscope images whereas it does work fine with any image taken with my DSLR camera. As a consequence, I suppose my images with nematodes slides are not meant to be used with this filter…
Here is a screenshot with 2 layers. The “source layer” underneath the layer stack on Gimp is the one I want to preserve as colors. Above there is second layer which I want use as a target (it is supposed to take the colors from the layer below).
Whenever I apply this filter nothing occurs (tried several settings).
Here is the result I am trying to reach:
Here is the Gimp .XCF file with the 2 images (as layers):
As of today, to get this same result I merge the images together and adjust the color of the images with the GIMP clone tool (but it is a time-consuming task…)
Perhaps there are better G’MIC filters to adopt: I have even tried to create a “LUT image” to no avail ?
Thanks in advance for any pointer on this subject.