Wrong color profile conversion of images with wavelet decompose layer groups
Lately I have been experiencing a problem (that was not there until 2-3 weeks ago) with color profile conversion when I use a layer group generated by the wavelet decompose filter and external color profiles.
Starting conditions: 16-bit floating point image; profile Oyranos ProPhoto-RGB
How to reproduce the problem: Use the wavelet decompose filter with two or more scales. Use image->Color Management->Convert to profile and select any profile (e.g. Built-in RGB).
Result: the base layer is converted correctly, while the luminosity of the layer group is changed noticeably as shown in the following images. (the histogram of the layer group obtained by merging the group first)
In the opposite conversion (Built-in RGB->ProPhoto-RGB, the luminosity is moved in the opposite direction).
Before reporting this but I have checked it again with the very latest git pulls of gegl, babl, and gimp.