Save tiff color profile for each layer
- This merge request is to address issue 6109
- The colour profile for a tiff image is now saved for each layer rather than just on the first layer
I've verified this by using a 2 layer test project.
Previously, the tiff metadata for this would look like so (note that absence of the ICC Profile field on the second image):
This change ensures the ICC Profile is included for all layers like so: