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Hello, I'm just writing because I have found a solution to a problem I was having recently. Since I found no solution online, I thought it might help someone else. For some time I had been having trouble with the high pass filters. What happened was that the filter was very bright (see picture below), and no detail showed up. When working correctly, the filter used to be dark grey and the details light grey. I first thought it might have something to do with the characteristics of the image, such as brightness or frequency, but it seemed to happen with any image. I had tried: - Reinstalling Affinity photo - Using different images - Looking online for a solution to no avail. SOLUTION : What finally solved my issue was going to the ICC profile menu (Document > convert format / ICC profile) and selecting RGB/8 or RGB/16 as a colour format (it was on RGB/32 because I had been doing some high resolution editing and tone mapping a few weeks earlier). I don't know why the 32-bit colour format does that to the high pass filter, but but 8-bit and 16-bit both seem to work fine for me.