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A ringing artifact is one where edges will have a sort of high-contrasting banding pattern across them. https://en.wikipedia.org/wiki/Ringing_artifacts

enter image description here

Even better would be to have multiple ringing bands, as seen here using a sinc filter:

enter image description here

I already have one way of adding this type of artifact by resampling it with a windowed sinc filter in ImageMagick, but I would like to be able to add this in blender directly. How do I do this?

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  • $\begingroup$ save to a jpeg file with a low quality. You'll see lots of those. $\endgroup$
    – user1853
    Sep 17, 2015 at 0:39
  • $\begingroup$ @cegaton I already have a better way to do it that I linked to. But yes, if there were no other way I definitely might try that. $\endgroup$ Sep 17, 2015 at 0:41

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Try using a Sharpen filter in the compositor:

enter image description here

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  • $\begingroup$ You could add a blur node after sharpen to optain something closer to the example $\endgroup$ Sep 17, 2015 at 9:18

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