Operating system: Linux-5.3.0-51-generic-x86_64-with-debian-buster-sid 64 Bits
Graphics card: GeForce GTX 670/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 435.21
Broken: version: 2.82 (sub 7), branch: master, commit date: 2020-03-12 05:06, hash: rB375c7dc4caf4
Short description of error
PNG pictures with alpha are wrongly composited in VSE. Same pictures are doing well in Gimp or Blender compositor.
Exact steps for others to reproduce the error
I can't obtain a "normal" result while compositing png with alpha in VSE. "Normal" is the result obtained with Gimp or blender compositor. VSE look like it makes alpha harder. Can't be solve by any tweaking. I have tried to switch
Alpha source setting to Premultiplied, change color spaces, but still not ok.
I have packed the entire process files.
-image-generator.blend : generate the png pictures
-Gimp-ok.xcf : png composited ok in Gimp
-compositor-ok.blend : png composited ok in Blender compositor
-VSE-problem : png wrongly composited in Blender VSE (on the upper left, the good result imported for reference)
Same problem on 2.79/2.81/2.82a/2.83 alpha
Discover that at the end of a project I had to redo my entire VSE editing in Blender compositor to obtain the normal result. Litterally no way out.
Thanks a lot if you can fix it!