Blurry canvas with brush tool

[z.liu]

Hello everyone,

I am totally new here and currently using the trial version of Affinity photo mainly for drawing/painting on a M1 Mac mini. I have noticed that, with brush strokes on the canvas, if the brush tip is moving, the whole canvas gets blurry. Does anyone have any insight about it? Thanks!

[GarryP]

Welcome to the forums @z.liu

If you can show us a screen grab – or video – that should help people to understand what is happening.

Also, give us a screen grab of your Document Settings.

[Guest]

It's a display refresh speed optimisation - a smaller mipmap level of the layers is used while the brush is moving and zoom is below a certain threshold. On my Retina iMac, the optimisation happens when zoom is less than 200%. On a "standard" pixel density display, maybe the threshold is 100% zoom, but I don't know.

I can disable it by changing Retina Rendering from its default of "Automatic (Best)" to "High Quality (Slowest)" in the app's performance preferences, but I don't know whether that is effective for a "standard" density display.

[z.liu]

@GarryP Thanks! I have changed the performance preference setting like @anon2 suggested. The problem seems to be solved. But if you are still interested. I have attached a screen capture video bellow to show the problem. 

@anon2 is there any downside to change the setting to "Slowest"?

[Guest]

54 minutes ago, z.liu said:

@anon2 is there any downside to change the setting to "Slowest"?

There is more lag when painting, but lag depends on canvas size, brush size and document bit depth, so it possibly won't disturb you much of the time.

[z.liu]

1 minute ago, anon2 said:

There is more lag when painting, but lag depends on canvas size, brush size and document bit depth, so it possibly won't disturb you much of the time.

Ok, thanks. I haven't noticed any lag so far. But I will pay attention to it.