Fixed in Vuo version:
- Mac OS 10.9
How severely does this bug affect you?:
●○○○ — Not much; I'm just letting you know about it.
Steps causing the bug to occur:
[Original title: Bizarre Alpha Behaviour- including saving PNG with Alpha Corrupt]
- Make a composition that uses alpha somehow
- Simplest way is to use
make radial gradient imageand set inside to white and outside to transparent
- save image with
- image is corrupt and horrible
Another related issue is that when using either alpha or any other channel in ShaderToy OR GLSL as a knockout channel, (such as: fragColor = vec4(image.rgb, alpha.a) then the output is horrible.
Have you found a workaround?:
Discovered that Vuo uses premultiplied alpha. Can we get this written up somewhere? (updated severity to match my fix)