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Like many on here I have tried to use Quick Mask and with the Paint Brush tool and it does not work. I have selected the WHITE color picker and alpha protect is OFF. I have one background pixel layer and it is unlocked. When I press Q it does create the RED Mask.

When I use the paint brush tool it does start to put some very weak black splodges under the red but in no way does it reveal the original section of the photo i want to select.

If I create a selection using one of the selection tools then create the Quick Mask it works perfectly on the selection I have made.

However using the Paint Brush it simply does not work Software is Affinity Photo 1.6.7 MAC OS is High Serria 10.13.6

Your help would be appreciated

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Make sure that the Paint Brush is selected.

The ink colour is white.

The colour opacity (Colour panel) is 100%

The brush opacity is 100%

Protect Alpha must be unticked


The brush Hardness and Flow is best set to 100% (at least for now).


Painting in Quick Mask mode.

This was done on a Windows PC but I have not heard of any bugs on the Mac. Check all the above items first.

Windows PCs. Photo and Designer, latest non-beta versions.

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35 minutes ago, toltec said:

This was done on a Windows PC but I have not heard of any bugs on the Mac.

It works fine for me, using my old iMac running High Sierra.

BTW, considering the OP's "very weak black splodges" comment, it is also worth checking which brush is selected in the Brushes panel & switching to one of the "Basic" ones to see if that changes anything.

All 3 1.10.6, & all 3 V2.03 Mac apps; 2020 iMac 27"; 3.8GHz i7, Radeon Pro 5700, 32GB RAM; macOS 10.15.7
Affinity Photo 
1.10.6; Affinity Designer 1.10.6; & all 3 V2 apps for iPad; 6th Generation iPad 32 GB; Apple Pencil; iPadOS 15.7

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