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Not long ago I have discovered the full sample feature on Blender. The feature is great and helps a lot. The problem is that whenever I render a frame with Full sample, the image is anti-aliased, but if I change something in the compositor, the image becomes aliased and remain jagged unless I render the entire frame. It is slowing me down because sometimes it takes several hours for a frame to render. Is it just like that, is there any way to avoid re rendering? Thank you!

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    $\begingroup$ It's not ideal, but one way to avoid the rerendering is to save the render output (without compositing) as a multilayer EXR file. Then apply the compositing using the EXR file, this avoids re-rendering. $\endgroup$ – Mike Pan Feb 13 '14 at 20:33
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    $\begingroup$ @MikePan Care to put that in an answer? Comments aren't really the right place for answers.. $\endgroup$ – gandalf3 Jul 27 '14 at 1:03
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One simple, however not ideal, is to save the final render to an external file; then loading it up and applying the composite to that.

I would recommend using a multilayer OpenEXR file; these however take up quite a lot of disk space.

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