--- Operating System, Graphics card ---
WinXP and Linux Ubuntu
--- Blender version with error, and version that worked ---
Tried with blender r55456 and official releases 2.65a and 2.66 with same bad result.
Last known working version was blender 2.56 r33949
--- Short description of error ---
In video editor, if you use the transform and afterwards the substract function, then the result in the preview is noisy. However, the result of the render is even worse, due to it shows a completely wrong result. The expectation is to have a oval shaped cut in the middle of the picture, but it happens to be rectangular. See Screenshot_problem.png in the attached 7z-file.
It worked properly, when I originally worked with Blender 2.56. See Screenshoth_working.png in the 7z-file.
--- Steps for others to reproduce the error (preferably based on attached .blend file) ---
Use .blend-file attached in this bug report. Is in the 7z file
Description
Event Timeline
Hi,
I have tried some more blender versions, I could find in net.
it seems, it got broken somewhere between official release 2.56b r33949 and official release 2.57a r36273
Hi,
I have done some more investigations.
It may happened, that with the bugfix for #25713 in r36197, my problem started. Unforetunatally, I could not find a blender release R36196, which I could download and try.
I hope, it helps.
Noise is fixed in svn rev55644.
As for difference in render result between 2.56 and 2.57 -- doesn't seem like it's something to do with r36197. More like way how subtraction happens was changed. Now it subtracts all channels separately, like R=Ra-Rb, G=Ga-Gb, B=Ba-Bb, A=Aa-Ab. Wouldn't call it wrong, just a chnage which happened a while ago and wouldn't want to change it again (it'll break compatibility one more time, which is not so nice). If you want the same roundish square transparent alpha, you need to edit your image externally and set alpha to 0 for black area.
Thanks for the report, but all non-destructive changes were commited now :)
I have found another reason for the wrong render result. The attached picture, shows the solution.
Thank you, for your time