Issue in Affinity Photo when painting around edges of objects

[Roo1980]

 Hi,

 

I am a novice with this software so apologies if I am not explaining myself properly.

 

But as an example of the issue I am having I have currently added a lens blur layer to my photo, I have then inverted it and I am painting in the areas I want to be blurred. But when I get near to the edge of a object a strange effect is appearing. I.E if I paint near to a darker edge it seems to be pulling the colour over almost creating a shadow affect and visa versa with lighter objects.

 

I have attached a couple of photos to help explain, I have seen this effect when I have been painting with other effects not just the lens blur.

 

Any advise as to what is happening here and how I can clear this up would be appreciated.

[Big_Stan]

I used to have the same problem in photoshop.  In photoshop I changed the brush color from pure white to an slightly grayer color.  If you were painting out, the color would be lighter than black, sort of middle gray

[Madame]

Have you by any chance checked "wet edges" in the context toolbar?
Or, if you dial down the hardness slider of the brush, does that help?

[Roo1980]

Thanks I will try these out and see if this helps.

 

I did try checking "wet edges" but to be honest didn't know what it is meant to do? Will try again though to make sure.