I saved my render (i use LuxRender) in a blender in two formats, png and exr, as a result my png looks exactly as it should, and in eksr nonsense it turns out when I open it in natron or in photoshop. The impression is that Blender in some strange color space saved my file. As a result, the layers in EXP are either with excessively high contrast, or problems with gamma.
if you use 8-bit format like png, jpg - gamma correction is baked in the picture - as a result you see render - if you save in 32 bit - file don’t save color correction and you need use gamma 2.2 or 0.4545 in side photoshop natron usually use sRGB as default but I don’t know what colorspace setup in blender. The last idia is change color preference to blender may be it helps get better result
Thanks for the answer. This seems to be true.