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Bug „Filter Perlin-Noise“

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Applying the filter to a layer with areas of full transparency (alpha=100%) fills the entire layer. 
Expected behavior would be to fill only the opaque areas and taken into account the alpha cannel. 
The "Preserve Alpha" option would also make sense in the filter.

Affinty Photo V., Windows

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Same on iPad.

Its about the destructive filter (there is a non-destructive version in procedural texture presets). I personally would not rate this as bug. The filter creates its own alpha, and replaces the layer below completely.

If you want preserve alpha, you can simply use the channels panel and uncheck “edit alpha”.


Mac mini M1 A2348

LG34WK950U-W, calibrated to DCI-P3 with LG Calibration Studio / Spider 5

iPad Air Gen 5 (2022) A2589

Special interest into procedural texture filter, edit alpha channel, RGB/16 and RGB/32 color formats, stacking, finding root causes for misbehaving files, finding creative solutions for unsolvable tasks, finding bugs in Apps.


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I add an example file. The botton layer ist the basis ist it was duplicated 3 times. Midle layer shows teh sesult with the Filter Perlin Noise. the complete layer ist filled. The top Layer shows a workaround. Before adjust the filter a adition mask is added. It shows asl result the aspected behaviour of the filter in the middle layer.

If you use filter add-Noise the behaviour is as espectected.


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On 4/18/2022 at 2:42 PM, erdi12 said:

Expected behavior would be to fill only the opaque areas and taken into account the alpha cannel.

To be honest, I'm not sure that that is what I would expect! 😉  I don't see it as a bug, just the way this filter works.

Acer XC-895 : Core i5-10400 Hexa-core 2.90 GHz :  32GB RAM : Intel UHD Graphics 630 : Windows 10 Home
Affinity Publisher 2 : Affinity Photo 2 : Affinity Designer 2 : (latest release versions) on desktop and iPad

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