Few words about V-Ray Passes - elements that any final you start combining passes. Basic color correction - which you should work - Linear. Basic color correction - which is necessary to do before you start combining passes 4.
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Now the brightness and contrast would be different in every image, and its a personal choice how much brightness and contrast you want to apply, because maybe this image looks too bright on some monitors or too dark in others. This changes the label colour of the layer in the Layers palette. Collection of professional post production techniques and methods that can make your renders look like real photos.
