Rendering: Alpha Channel is Broken. #40903

New Issue

paul geraskin · 2014-07-01T15:26:54+02:00

paul geraskin commented

2014-07-01 15:26:54 +02:00

System Information
Linux 64bit, nVidia gtx 256

Blender Version
2.71 2e840e5 (dayly build)

Short description of error
Alpha channel is broken! It should be fully White!

Image: http://i.imgur.com/HcNHHfQ.png
File: https://dl.dropboxusercontent.com/u/26887202/blender/test_alpha_Broken_01.blend

Alpha is broken in Cycles and in Internal renderers.

Exact steps for others to reproduce the error
Render.

PS: Please check if internal re

**System Information** Linux 64bit, nVidia gtx 256 **Blender Version** 2.71 2e840e5 (dayly build) **Short description of error** Alpha channel is broken! It should be fully White! Image: http://i.imgur.com/HcNHHfQ.png File: https://dl.dropboxusercontent.com/u/26887202/blender/test_alpha_Broken_01.blend Alpha is broken in Cycles and in Internal renderers. **Exact steps for others to reproduce the error** Render. PS: Please check if internal re

paul geraskin commented

2014-07-01 15:26:54 +02:00

Changed status to: 'Open'

paul geraskin commented

2014-07-01 15:26:54 +02:00

Added subscriber: @PaulGeraskin

Michal Koziatek commented

2014-07-01 16:15:08 +02:00

Added subscriber: @mike91

Michal Koziatek commented

2014-07-01 16:15:08 +02:00

Oh, I got the same problem!! I'm new to Blender and I realized lately that when I save PNG as RGBA it does not preserve Alpha channel properly. Glad I'm not alone in this :)

ronan ducluzeau commented

2014-07-01 16:39:38 +02:00

Added subscriber: @zeauro

ronan ducluzeau commented

2014-07-01 16:39:38 +02:00

Blender 2.71 ubuntu14.04 64bits

I confirm that there is a problem.

WrongAlphaComposite.blend

Render image in this .blend.

Composite node have a problem. When something is plugged in alpha channel, it modifies combined result.
When alpha socket from renderlayer is plugged into alpha socket of Composite node: it modifies alpha result instead of displaying same result than with no plugged.

Blender 2.71 ubuntu14.04 64bits I confirm that there is a problem. [WrongAlphaComposite.blend](https://archive.blender.org/developer/F96198/WrongAlphaComposite.blend) Render image in this .blend. Composite node have a problem. When something is plugged in alpha channel, it modifies combined result. When alpha socket from renderlayer is plugged into alpha socket of Composite node: it modifies alpha result instead of displaying same result than with no plugged.

ronan ducluzeau commented

2014-07-01 16:42:19 +02:00

Sorry , I forgot the hash : 61e5f81. There is no problem in official 2.71.

Sorry , I forgot the hash : 61e5f81. There is no problem in official 2.71.

Aditia A. Pratama commented

2014-07-01 17:19:34 +02:00

Added subscriber: @AditiaA.Pratama

Aditia A. Pratama commented

2014-07-01 17:19:34 +02:00

I've tested the wrongAlphaComposite.blend in latest master and crash, here's the debug log http://www.pasteall.org/52560

along with crash.txt tested in ubuntu 14.04 64bit.
WrongAlphaComposite.crash.txt

I've tested the wrongAlphaComposite.blend in latest master and crash, here's the debug log http://www.pasteall.org/52560 along with crash.txt tested in ubuntu 14.04 64bit. [WrongAlphaComposite.crash.txt](https://archive.blender.org/developer/F96202/WrongAlphaComposite.crash.txt)

Lukas Tönne self-assigned this 2014-07-01 17:30:49 +02:00

Lukas Tönne commented

2014-07-01 17:59:17 +02:00

Added subscriber: @Sergey