Making brush radius not be so badly quantized

[_fluffy]

When drawing with Affinity Photo, I often run into issues where the brush pressure causes what looks like quantization in the brush radius:

 

There's a distinct lack of tapering and smoothing between the various steps on the brush size, which are all being rounded to the nearest pixel radius. I'm using a Wacom Intuos which hasn't had problems like this in other drawing software, and it particularly happens on the standard round brushes set with pressure-based size jitter:

Is there a way to get smooth brush tapering (with subpixel sizes) like what most other drawing programs support?

[walt.farrell]

Could we see a screenshot of the Performance section of your Photo Settings, please?

Also, how zoomed-in are you in the screenshot you already gave us?

[_fluffy]

Sure, here's the performance section:

And I'm zoomed in pretty far, and those jumps are a single pixel at a time. But even zoomed out it's pretty bad-looking, and other drawing tools (such as Photoshop, Clip Studio Paint, heck even GIMP) don't have this issue since they support some amount of subpixel brush sizing.

[cgidesign]

Seems to be related to this post from 2022 !

There is no bug-number assigned to it. I guess, it is not something that will be optimized in the forseeable future.

[walt.farrell]

2 hours ago, cgidesign said:

There is no bug-number assigned to it. I guess, it is not something that will be optimized in the forseeable future.

Actually, there is, though it's an "old-style" number: AFP-5701.

Good catch. 

When the Serif team gets to this topic, they may be able to confirm it's related, and give us a new bug number.

[_fluffy]

Ah thanks, I'd done a search figuring others had experienced this too, and I didn't expect it to be that far back! Hopefully someone on the dev team takes a look at it now.

It does seem like a workaround is to set the brush to 99% hardness, at least.

[cgidesign]

10 hours ago, walt.farrell said:

it's an "old-style" number: AFP-5701.

😀 I missed that - an old number for an old dust gathering bug.

[MEB]

This is indeed the same bug as pointed out by @cgidesign above.
Bug report updated/bumped (now logged as AF-4217).
More details on my reply in the other thread here.