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Maniphest T24979

ColorRamp, ColorBalance nodes ignore alpha
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Description

win32, r33341

Seems that Color Ramp and Color Balance ignores alpha masking (and I guess that other like ToneMap nodes acts alike too).

toDo:

1. render
2. tweak ColorRamp and ColorBalance nodes to change Glow's color and gradient

It looks like it acts in Mix node ignoring alpha that must select only "Glow" zone.

Event Timeline

Moolah Nasreddin (moolah) edited a custom field.Nov 29 2010, 11:29 PM
Moolah Nasreddin (moolah) attached 1 file(s): F13590: ColorRamp_ColBalance_alphaIgnore.blend.
Brecht Van Lommel (brecht) added a comment.Nov 30 2010, 7:40 AM

Due to using subtract, the input fac of the mix node has negative values. You can use a Math node with maximum 0 to avoid this. Not a bug as far as I can see.

Brecht Van Lommel (brecht) changed the task status from Unknown Status to Archived.Nov 30 2010, 7:40 AM
Moolah Nasreddin (moolah) added a comment.Nov 30 2010, 3:03 PM

Oops, sorry!
I got I had need to convert this with SetAlpha block. Alpha was OK because I needed to separate the glow layer from the planet layer.
Though "Fac" description in tip is a bit confusing (it's just about a socket).