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.
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.
Well, if you simply switch to 8-bit mode in Photoshop and don't flatten, that should work just fine. It should use the equivalent of the simple "Exposure and Gamma" HDR toning method.
One thing to note is that layers will composite differently in 8-bit sRGB than they would in 32-bit linear. Usually the renderer expects you to composite in the space of the file it renders.
What if you kept the 32bit layers in a smart object within an 8bit parent file? I read your post from the other forum, but without seeing a file and what you're