Images with alpha channel broken under non sRGB color space in Sequencer #52071

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opened 2017-07-15 17:33:58 +02:00 by Paulo José Oliveira Amaro · 7 comments

Paulo José Oliveira Amaro commented

2017-07-15 17:33:58 +02:00

System Information
Ubuntu 17.04 - Intel Integrated Graphics

Blender Version
Broken: 2.78 - blender-2.78-80095645036-linux-glibc219-i686.tar.bz2
Worked: 2.77

Short description of error
Images with alpha channel are displayed incorrectly under any non sRGB color space (i.e. Linear, Filmic...) in Sequencer. Changing the alpha mode to Premul doesn't prevent the bug.

Exact steps for others to reproduce the error

Place a image with transparency over an opaque one
Change the Sequencer Color Space from sRGB to Linear, Filmic, RAW...

Images

Working under sRGB in 2.78:
Broken under Linear in 2.78:
Working under Linear in 2.77:

Blend file
blender-2.78-sequencer-alpha-channel-bug.zip

**System Information** Ubuntu 17.04 - Intel Integrated Graphics **Blender Version** Broken: 2.78 - blender-2.78-80095645036-linux-glibc219-i686.tar.bz2 Worked: 2.77 **Short description of error** Images with alpha channel are displayed incorrectly under any non sRGB color space (i.e. Linear, Filmic...) in Sequencer. Changing the alpha mode to Premul doesn't prevent the bug. **Exact steps for others to reproduce the error** - Place a image with transparency over an opaque one - Change the Sequencer Color Space from sRGB to Linear, Filmic, RAW... **Images** - Working under sRGB in 2.78: ![Blender-2.78-sRGB.png](https://archive.blender.org/developer/F668364/Blender-2.78-sRGB.png) - Broken under Linear in 2.78: ![Blender-2.78-Linear.png](https://archive.blender.org/developer/F668362/Blender-2.78-Linear.png) - Working under Linear in **2.77**: ![Blender-2.77-Linear.png](https://archive.blender.org/developer/F668366/Blender-2.77-Linear.png) **Blend file** [blender-2.78-sequencer-alpha-channel-bug.zip](https://archive.blender.org/developer/F668371/blender-2.78-sequencer-alpha-channel-bug.zip)

Paulo José Oliveira Amaro commented

2017-07-15 17:33:58 +02:00

Author

Changed status to: 'Open'

Changed status to: 'Open'

Paulo José Oliveira Amaro commented

2017-07-15 17:33:58 +02:00

Author

Added subscriber: @PauloJoseOliveiraAmaro

Added subscriber: @PauloJoseOliveiraAmaro

Brecht Van Lommel commented

2017-07-16 01:30:58 +02:00

Owner

Added subscriber: @brecht

Added subscriber: @brecht

Brecht Van Lommel commented

2017-07-16 01:30:58 +02:00

Owner

Confirmed, looks as if premultiplied alpha is not being taken into account properly when doing the color space conversion.

Confirmed, looks as if premultiplied alpha is not being taken into account properly when doing the color space conversion.

Sergey Sharybin commented

2017-09-13 15:54:50 +02:00

Owner

Added subscriber: @Sergey

Added subscriber: @Sergey

Sergey Sharybin commented

2017-09-13 15:54:50 +02:00

Owner

Changed status from 'Open' to: 'Resolved'

Changed status from 'Open' to: 'Resolved'

Sergey Sharybin closed this issue

2017-09-13 15:54:50 +02:00

Sergey Sharybin self-assigned this 2017-09-13 15:54:50 +02:00

Sergey Sharybin commented

2017-09-13 15:54:50 +02:00

Owner

This issue was already fixed by 71f0c32dad.

Thanks for the report anyway!

This issue was already fixed by 71f0c32dad8. Thanks for the report anyway!

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Reference: blender/blender#52071

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