[1.9.0.199] Levels: Alpha channel: inconsistency and in some cases broken

[IPv6]

There is a problem with manipulating alpha channel, which is really annoing since some tricks that worked well in previous releases are just not working in beta //

Lets say we have a layer with partial transparency (gradient in alpha channel). And a "Level" adjustment, that remaps alpha to higher half. See screenshots.

1) When no groups and Level adjustment right above pixel layer every thing is ok -> Alpha altered in proper way

2) When the same hierarchy is grouped - alpha brokens completely with som dithering dots at the edge and pixel-empty area, see screenshot

3) When Level added directly to pixel layer - it just does not work at all (but it shoudl and it worked in previous versions)

In both 3 cases proper behaviour should be exactly the same (as in 1), there is no difference in terms of compositing

 

LevelsAlphaBroken.afphoto

[MEB]

Hi IPv6,
Thanks (again!) for your reports. These issues are not exclusive to v1.9 Beta, v1.8 behaves exactly the same way. If i'm not wrong the second case is already logged. I will check it out and update the report if necessary.

[IPv6]

Strange, i hit this bug in real situation and it worked well earlier... But may be there were differences in case of 2

UPD: Rechecked in release and yes, you are right, it`s the same behaviour.

Initially, i just hit the alpha problem in more complex situation (nesting+masks, etc) which worked well before and got broken with beta update. And make simplified version to demostrate the bug. Seems there is something else should be taken into account than //

Anyway, from compositing logic all three cases should be the same (correct me if i`m wrong)?

[IPv6]

Same problem in 1.9.0.203 //
 

[IPv6]

Still a problem in 1.9.0.206... but other compositing bugs now seems to be fixed, thanks god

[MEB]

Thanks IPv6. Hopefully this one will be too. Just give us a bit more time.