Cycles - Bake - Black patches I have been trying to figure out why my object is rendering so dark. I have been messing with diffuse and other settings through reading other help forumns. I still can't figure out what the issue is and now I am getting a big black box in my painting. Can anyone explain to me what I am doing wrong?

The blender file is here: https://drive.google.com/open?id=1Q6TLXFYbRHifzNpNDP_BfoBC_qcXwLb9
The object (s4studio_1) in front of your "photography" generates black "patch", it causes graininess (noise) as well.

The object is disabled from Global Viewport, but not from Rendering (Bake).
Disabling the object from Render solves the issue.





The darker appearance of photography can be solved by changing value of Mix Shader from 0.7 to 0.5, but for more info of mixing Diffuse/Glosy try this
Confusing problem when I&#39;m trying to mix Diffuse with Glossy shader



BTW: Lightning your scene by strong "Ambient Oclusion" (1.75) doesn't seem to be a good way for some natural result. Your four lamps are not (visibly) lightning the scene anymore. Deleting them you can see any difference. In this screen only World color (HSV 0/0/0.8) and Sun strenght 3 does the job.