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Maniphest T45683

The "Composite" compositor node does not take affect unless the Render Result is open in another window
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Description

System Information
Windows 7
NVIDIA GeForce GTX 660 Ti

Blender Version
Broken: 2.75a c27589e (But if I can recall correctly this bug has been around for a while)

Short description of error
The composite node will not update the "Render Result" unless the "Render Result" is open in a window while blender is composting.
So if you don't have the "Render Result" open in a image editor the composting will not take affect.

Made a quick video demonstration as well:
https://www.youtube.com/watch?v=afmlNH2CUHk
I realized some of the text in the video might appear a bit fast, but you'll just have to use the pause button if you want to read it.

Exact steps for others to reproduce the error
https://www.youtube.com/watch?v=afmlNH2CUHk

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Event Timeline

Nils Söderman (rymdnisse) created this task.Aug 5 2015, 11:58 AM
Nils Söderman (rymdnisse) raised the priority of this task from to 90.
Nils Söderman (rymdnisse) updated the task description. (Show Details)
Nils Söderman (rymdnisse) added a project: BF Blender.
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Sergey Sharybin (sergey) changed the task status from Unknown Status to Unknown Status.Aug 5 2015, 1:50 PM
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Sergey Sharybin (sergey) added a subscriber: Sergey Sharybin (sergey).

Thanks for the report but this is exactly intended behavior to avoid unnecessary calculations when working with compositor. This way you can much easier composite 4k frames and such.

Some reconsiderations are possible here, but those are not a subject of the bug tracker.