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I have designed this jewel:

enter image description here

I am using Compositing nodes for the final render, to add a glare effect, as such:

enter image description here

But the result is that some of the edges of the golden shape are irregular where the glare is most present:

enter image description here

I have tried to change the settings in the Compositing nodes, which didn't do anything, and I can't seem to find a way to make the edges as sharp as they should be.

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  • $\begingroup$ Can you upload your .blend file to Blend Exchange? $\endgroup$ – Shady Puck Aug 12 '16 at 1:24
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    $\begingroup$ Is the render resolution set to 100%? Have you tried setting the quality in the glare node from medium to high? $\endgroup$ – cegaton Aug 12 '16 at 2:11
  • $\begingroup$ @ShadyPuck I just added the .blend $\endgroup$ – MicroMachine Aug 14 '16 at 5:19
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    $\begingroup$ @fabriced I must confess I don't really see anything obviously amiss in both circled regions.. What exactly are you looking for in terms of "sharpness"? $\endgroup$ – gandalf3 Aug 14 '16 at 5:32
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    $\begingroup$ Unrelated, but I thought I'd mention that the alpha-over node in your setup isn't needed. If you want to mix between the original image and the glareified version, the mix setting on the glare node can be adjusted; -1 is the original unmodified input, 0 is the glare + input, and 1 is just the glare (and everything in-between is a mix). $\endgroup$ – gandalf3 Aug 14 '16 at 5:36
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Combining cegaton and gandalf3's comments, I removed the useless Alpha Over node:

enter image description here

then switched the setting for the Glare node to "High":

enter image description here

This resolved the pixelation / jagged diagonal lines I was seeing:

enter image description here

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