Skin color and eye shader changes after finalizing

[vincurekf]

Describe the bug After finalizing the character (Caucasian female) the skin color gets slightly unsaturated and eyes are darker, under the same light conditions (default portrait studio lights)

To Reproduce Steps to reproduce the behavior:

1. Open new empty project
2. Create new MB-Lab character
3. Make render before finalizing
4. Finalize character
5. Re-render scene

Expected behavior Skin and eye shader should stay the same after finalizing.

Screenshots

Additional context Some tweaking in skin shader can bring the expected result back. The skin_complexion and skin_veins seems to be responsible for this change in color. I could not check with older versions of MB-Lab because all installations were throwing an error when creating new character.

Logs Logs after pressing Finalize

bpy.context.area.ui_type = 'CONSOLE'
bpy.ops.mbast.button_finalize_on()
bpy.context.space_data.recent_folders_active = 0
bpy.context.space_data.params.filename = "skin-preview.png"
bpy.ops.object.modifier_apply(apply_as='DATA', modifier="mbastlab_armature")
bpy.ops.object.posemode_toggle()
bpy.ops.pose.armature_apply()
bpy.ops.object.posemode_toggle()
bpy.ops.object.editmode_toggle()
bpy.ops.object.editmode_toggle()
bpy.ops.object.editmode_toggle()
bpy.ops.object.editmode_toggle()
bpy.ops.object.modifier_move_up(modifier="mbastlab_armature")
bpy.ops.object.modifier_move_up(modifier="mbastlab_armature")
bpy.ops.object.modifier_move_up(modifier="mbastlab_armature")
bpy.ops.object.modifier_move_up(modifier="mbastlab_armature")
bpy.ops.object.editmode_toggle()
bpy.ops.object.editmode_toggle()
bpy.ops.mbast.finalize_character_and_images(filepath="/home/vincurekf/_500GB/Blender_Assets/Models/MBLab/SkinPreview/final/skin-preview.png")

Running Blender 2.82.7

[animate1978]

I will look into this as soon as I can.

[animate1978]

I did manage to see this effect, only after comparing images.

Before Final

After Final

I am still not sure exactly WHY this is happening I will look at your logs though and see what the heck is going on

[thelabcat]

I confirm this report. When I finalize female models, they turn greyer.

[animate1978]

Testing out more recent builds of Blender to see if this bug still exists...

Pre-Final

Post-Final

It is hard to tell now... there is a slight change I think but I think that it's not as bad as before?? I need to go into GIMP and do some image analysis.

For the record I am using Blender 2.91.0 and MB-Lab 1.7.8.50... with a modified shader still yet to commit to GitHub.

[animate1978]

Using GIMP to do some image analysis... the above are composited together, old renders and new renders... using the Subtract blending method. The smaller image of the two are older, while the larger image was just rendered this morning.

I think that the "bug" has been "fixed" somehow... not exactly sure what I changed in the shader, or if this was a Blender bug that has been resolved?

[thelabcat]

Hey! Check this out on Stack Exchange. It looks similar, and has to do with anime characters coming out dull colors in renders

[animate1978]

That actually makes a lot of sense.... Now I have to do some tests to see if there is any differences between the renders again but that shouldn't take too long