ND_range_color4 applies gamma to all channels

[numega]

Currently, the nodegraph for ND_range_color4 applies the gamma value to all channels (including the alpha channel). Should this be changed to only the rgb channels?

[dbsmythe]

If you provide a float value for "gamma", the more consistent-with-other-operations result would be to apply it to all four channels, including alpha, e.g. the current behavior, which I think would actually be the desired behavior in many (most?) cases if the RGBA is a premultipled (matted-to-black) color. If the desired result is to apply a gamma to just RGB and not to Alpha, you should be able to provide a four-channel color4 "gamma" value (gamma, gamma, gamma, 1.0) to do what you're asking.

[jstone-lucasfilm]

@numega @dbsmythe I'll close out this issue, since the current behavior seems correct, but feel free to write up new issues as needed.