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YUVA bug
Closed, InvalidPublic

Description

System Information
windows7 64
ASUS ATI Radeon HD6870

Blender Version
Broken: (All)
Worked: (None)

Short description of error





Exact steps for others to reproduce the error

open, f12, repeat my test YUVA node

Details

Type
Bug

Event Timeline

Alexey (Inwader77) updated the task description. (Show Details)
Alexey (Inwader77) raised the priority of this task from to Needs Triage by Developer.
Alexey (Inwader77) set Type to Bug.

Do not know enough about color spaces to be sure, so will let @Sergey Sharybin (sergey) decide here. But imho there is no bug here. If you’ve read your link (https://en.wikipedia.org/wiki/YUV), you’ve noted there is not one YUV conversions, but many different variants, with different weights between colors.

Further more, things like colors space of the display may also have influence here - and we do not even know the precise specs used to generate that picture from wikipedia!

Bastien Montagne (mont29) triaged this task as Normal priority.Aug 12 2015, 4:49 PM

Compositor uses BT.601 and the matrix used for this completely matches the one from wikipedia, see [1] and [2].

It's also important to stress that compositor works in linear space, which could introduce additional difference from the image form wikipedia.

Thanks for the report, but it doesn't seem to be a bug at all.

[1] https://developer.blender.org/diffusion/B/browse/master/source/blender/blenlib/intern/math_color.c;aac6ee6b870eb968d37c16039e6cdc579df17288$89
[2] https://en.wikipedia.org/wiki/YUV#SDTV_with_BT.601