Tao Chen

jsmack
Are you trying to disable alpha premultiplication in the 3d viewport? I don't think it's possible.

This is the result of rendering.
Disabling it in the 3D view doesn't seem to work, or maybe I haven't found the corresponding switch.

The second one doesn't have an alpha channel。
Is there any way to turn it off?

mestela
I found this with PNG. Support told me to set an envvar to tell it to not automatically premult:

export OPENIMAGEIO_IMAGECACHE_OPTIONS=unassociatedalpha=1.max_memory_MB=8192

The other way is to load the image through cops, set the premult/unpremult on the file cop, and reference the image into your vex wrangle via the op: syntax.

Hellow, Where is this added to？
I added Variables, it didn't work.