Premultiplied alpha bug

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1. That the issue has not already been disclosed
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All bug reports should include the information below, along with a detailed description of the issue and steps to reproduce it.
A. Operating System, including version (i.e. Win 7, OSX 10.11.2, Ubuntu 14.04, etc.)
B. Graphics Card(s) model (i.e. GTX 580 - 3GB, TITAN, etc.)
C. RAM Capacity (i.e. 6 GB)
D. Nvidia driver version (i.e. 7.50, 7.5.22)
E. OctaneRender Standalone version, if installed (i.e. 2.24.2, 2.23, etc.)
F. OctaneRender plugin version (i.e. v2.25 - 2.21)
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J.C
Licensed Customer
Posts: 1857
Joined: Thu May 13, 2010 6:35 pm
Location: Wrocław

aufwind wrote:For you to try out just the Render Layer with alpha channel Export and a Version with a different background.
I'm still on Octane Blender Version 3.07. So maybe it is a Problem with newer Versions or just some setting problems in Photoshop...
I don't know if v3 will work with my RTX GPUS but v4 does. Unfortunately on v4 it is the same.
CPU – i9 13900KF, 128GB RAM, GPU – RTX 4090
System – Windows 11
My Behance portfolio, Blender plugin FB support group
J.C
Licensed Customer
Posts: 1857
Joined: Thu May 13, 2010 6:35 pm
Location: Wrocław

I've found the reason of such behaviour. The Blender's gamma was set to .04545 and display device was set to sRGB.
Setting back to None and gamma 1 brought back the correct alpha on renders.
CPU – i9 13900KF, 128GB RAM, GPU – RTX 4090
System – Windows 11
My Behance portfolio, Blender plugin FB support group
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