What if I still want to have layers and do not want to flatten the image?
As I already tried to describe my problem in other forum, I provide a link here.
CGTalk - Problem with composing EXR file / brightness
Would be great if anyone could say few words about this problem.
In the last post it's also described how I tried to compose 8bit tiff layers in PS to achive same look as one single Tiff (rendered picture) itself, with no luck either.