[Bf-committers] Color space and alpha issues

Troy Sobotka troy.sobotka at gmail.com
Thu Dec 22 00:24:19 CET 2011

On Wed, Dec 21, 2011 at 11:22 AM, gespertino at gmail.com
<gespertino at gmail.com> wrote:
> uh, oh! Luminescent premul doesn't seem to be possible in Blender either.
> The alpha-over node seems to be skipping pixels with alpha=0 from the
> second operator.
> http://ubuntuone.com/4vtqL5bN74wMfsBbl9QkMZ
> Troy is investigating the problem and promised a patch for the end of
> the day. :-p

Bug report: http://projects.blender.org/tracker/index.php?func=detail&aid=29675&group_id=9&atid=498

It should be noted that Blender generates negative alpha values using
the internal renderer according to Guillermo's demonstration file as a
result of antialiasing procedures, so a Colorramp node was added to
clamp the rendering alpha output.

With respect,

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