If Alpha is 0, then do not have a way to access the origin rgb values.
Anyone knows what can I do to use VEX get rgba without pre multiply alpha. Thanks a lot.
export OPENIMAGEIO_IMAGECACHE_OPTIONS=unassociatedalpha=1.max_memory_MB=8192
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.