[Bf-committers] Why did change the existing behavior of compositor?

IRIE Shinsuke irieshinsuke at yahoo.co.jp
Thu May 24 13:22:16 CEST 2012

Hi developers,

As I have reported 5 days ago, new compositor behaves in the different
way from old compositor when converting a color into a scalar value:


That is, in the old compositor,

  output value = (R + G + B) / 3


  output value = R * 0.35 + G * 0.45 + B * 0.2

while in the new compositor,

  output value = (R + G + B) / 3 * A


  output value = (R * 0.35 + G * 0.45 + B * 0.2) * A

This change is very annoying that requires me to modify many existing
.blend files.  So, I posted a patch that rolls back the behavior:


but still got no response.

Please let me know if this change accidentally happened or is intended
and if I really have to modify my .blend files.

IRIE Shinsuke

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