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Gaussian Blur Version Differences

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Edit: Thanks to those who helped me out with this - switching to Apophysis 7X version 15B solved it.

I noticed a while ago that with the latest versions of Apophysis 7X (I've tried 15C and 15D), the blur variations are acting oddly for me, and have a stepped/posterized appearance. I posted an example on the right of the same Gaussian Blur, but from Apophysis 2.09. I'm sure that Apophysis 7X never used to have this issue for me... Does anyone know if it's caused by the version itself, or if it's likely to be my computer? I'm running Windows 7.
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ChaosFissure's avatar
Different versions of Apophysis handle some variations differently, and I think blurs were and example of this.  I don't know if it's related to threading (i.e. if you use a single thread, does the issue resolve itself?), or what the root reason is.  I recall that FarDareisMai made a some samples showing differences in rendering between a few versions of Apophysis, but I don't know where that would be.

If you're looking for a workaround, I might suggest adding some pre-blur to that layer to break apart the edges, though I can't say how effective it would be for your use case.