Colored glitch at boundary when using Maximum/minimum filter on png with alpha

[rikkarlo2]

I've found a bug in the maximum/minimum filters in affinity photo V2 for windows in case of png with alpha channel. 

The first image is how affinity apply the maximum filter onto a PNG image with an alpha channel. The second one is how it should work.

I realized the second image by filling the background with black and merging the original image with it, then I applied the maximum filter to the image. This solves the coloured glitches at the edges of the leaves however it loses the alpha channel, so to reintegrate the alpha I reapplied the filter to the original png with the same radius, and then I've imported the alpha channel to the image with black background.

[NathanC]

Hi @rikkarlo2,

I'm not seeing this unexpected colouration on the transparent PNG samples i've used so far. Could you provide a copy of the original PNG prior to applying the filter so I can take a look and confirm it's reproducible? Could you also advise if you're using the live or destructive version of the filter that would be great.

Many thanks

[rikkarlo]

Hi, unfortunatelly I've trashed the image but I observed the same behavior with several cutout pictures from photos downloaded from the web.

I'm using the distructive filter.

 

As soon as I'm in front of a pc I'll try to replicate it again and update the thread here.