Hi,
to be consistent with 3ds Max and Cinema 4D we have decided to no longer premultiply RGB channels by alpha while saving EXRs in Corona Image Editor, Corona Standalone, and in VFB of Corona for Cinema4D. This should avoid the above reported "edge/window/etc. darkening while saving into EXR" issues.
This change does not affect the CXR format. The change will be probably incorporated into next daily build.
(The premultiplication is actually required by the EXR standard and we were just following it. But it has lead to misunderstandings because 3ds Max nor Cinema 4D do not do it, which is wrong, but expected by many users and other software.)
