Unable to erase from an fx mask

[alastair.newson]

Hi,   I've just started using Affinity.   I've create an FX layer with Gaussian Blur, and then created a mask on this layer so I can selectively control the effect.   I'm finding both the pencil and erase tools are painting on the mask.  My reading of the manual online suggests the erase tool should clear the mask.   I've opened up the make layer so I can see it using the alt key.  There I can see both tools paint on the mask.  Is this expected behaviour - should I do something else to clear the mask after painting on it?     

 

Am I doing something wrong?   thanks

 

 

[Callum]

Hi Alastair.newson,

 

Welcome to the Forums :)

 

Please could you try setting the Paintbrush tool to black and use it to paint over the mask. This should allow you to erase parts of the mask , you can also then set the brush to white to bring parts of the mask back :)

 

C

[alastair.newson]

Thanks,  that worked  :)