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weird halos after Gaussian Blur

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weird halos after Gaussian Blur
Espermaschine Offline
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#1
05-06-2018, 10:19 AM (This post was last modified: 05-06-2018, 10:20 AM by Espermaschine.)
You guys experiencing this as well ?

I fill a selection with white, open the Gaussian Blur, play around with the values and everything looks fine but after i hit OK, the blur looks weird and has some kind of halo....

   


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Ofnuts Offline
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#2
05-06-2018, 04:28 PM (This post was last modified: 05-06-2018, 04:30 PM by Ofnuts.)
I see it, but I think it is an optical illusion. If it where real, there would be a threshold value that would create a white circle with a white ring.

Edit: extreme values of the threshold (on both sides) show that the filters is not  strictly isotropic.
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Espermaschine Offline
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#3
05-06-2018, 04:57 PM
(05-06-2018, 04:28 PM)Ofnuts Wrote: the filters is not strictly isotropic.

what does that mean ?
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Ofnuts Offline
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#4
05-06-2018, 06:04 PM
Isotropic: identical in all directions. The blurred circle should remain a circle. In practice for the extreme values, it looks like a rounded diamond, so the diagonals are not strictly like the verticals/horizontals.
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