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Compositing displace node
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Description

The compositing displace node can not be limited to an area, it always displaces the whole image half a pixel or bluring all of it slightly.
(Even as the x and y scale are set to 0.5)
I am using 2.74 hash 000dfc0

Arild

Linux mint 17 64bit
i7 cpu x980
gpu quadro 4000

Event Timeline

arild andersson (konke) set Type to Bug.
arild andersson (konke) created this task.
arild andersson (konke) raised the priority of this task from to Normal.
Bastien Montagne (mont29) raised the priority of this task from Normal to Needs Triage by Developer.
Julian Eisel (Severin) triaged this task as Needs Information from User priority.

Hey @arild andersson (konke),
Not really sure what you mean, could you describe exact steps to reproduce this, what you see and what you expected to see instead?

Hi @Julian Eisel (Severin)
Sorry for the unclear bugreport.
I'll upload a blendfile.

This is what I've done

  1. Create an uvgrid image
  2. Connect it to the displace node in the compositor
  3. Set the vectors in the displace node to x:1 y:1 z:0
  4. Add an eclipse mask with an value of 1 and a grey background ( 0.5)
  5. The the uvgrid is displaced as expected according to the eclipse mask.
  6. The whole image is also affected. Watch closely at the border of the image ( sqaure E1 for example) while you mute/unmute. The image gets a little bit fuzzy when the displace node is enabled. See closeup image displace

Arild

Julian Eisel (Severin) raised the priority of this task from Needs Information from User to Confirmed, Medium.

Ah can see now what you mean. The issue becomes much more visible with a bit more extreme vector values like 20/20/20

@Sergey Sharybin (sergey) mind having a look on this one?