I would like to use Darktable to post-process my 3D render from Blender (.png or .exr).
I have one problem with Darktable, and I think it’s normal. All my renderings have a transparent background (Alpha channel), and when I export to PNG from Darktable, I lose transparency.
From what I found, Darktable does not support the Alpha channel. Can you confirm this?
I would agree that it would be nice to be able to use DT for this (which I do all the time) and retain a proper(ly modified) alpha.
On the the latter: unfortunately it is not enough to preserve and copy the alpha back , e.g. using ImageMagick. Certain operations, like bloom, should alter the alpha.