SiliconAya wrote:This is a colour space issue, it happens all the time now days, the plugin is not consistent about it at all, and the 2022.x based version of the plugin seems to mostly get it wrong for opacity maps, setting their color space to sRGB.
Ah yes, I'd forgotten about this. Octane 2022.1 helpfully tries to guess the colorspace when it loads the image, which overrides any selection made before loading the file and any logic in the plugin. This should be fixed in the next release.