Paint Mixer Brush applies max color on painted regions where brush applies light color due to light pressure

[Benfischer]

If I paint a region in Affinity Photo with light pressure, resulting in a lighter tone to the colors, because of flow and/or accumulation varying with pressure, and then if i go back with the paint mixer brush to blend to adjacent areas, the paint mixer brush immediately paints the "max" or pure color (what would have been painted with max pressure).

In the video attached, on the left hand side I paint different shades of black using pressure and on the right I paint different shades of gray using max pressure on the stylus, though I must have had a lighter pressure on the first line. Then I switch to the paint mixer brush and on the left it paints pure black all the way down, but mixed as expected on the right, other than the lightest block.

 

 

 

[Dan C]

Thanks for your report @Benfischer & our sincerest apologies for the delayed response here, as our team are exceptionally busy due to our current 50% sale & extended trial offer.

I've tested this further and it appears to be due to how channel data is created when using a brush with pressure, compared to when using varying grey levels.

When inspecting the Channels for brush strokes created with pressure variance on Accumulation (ie opacity on pressure), they seemingly only have alpha Channels created & there's no data for the RGB channels, which I believe is what the Paint Mixer Tool uses.

The 'Composite Alpha' channel shows both sets of strokes, 'Composite R,G,B' Channels shows only the ones created with varying grey levels, rather than pressure.
This means when using the Paint Mixer tool on the pressure strokes, the result is always 100% pure black as the tool has no RGB data to 'mix'.

I'm not 100% certain if this is expected behaviour based on how the Accumulation variance is designed to work, especially when using the Paint Mixer Brush Tool in conjunction & therefore I'm getting this logged with our development team now for further investigation/consideration.

I hope this helps

[Benfischer]

Thanks for looking into it. It’s good that Serif’s initiatives are leading to more interest in the Affinity suite!

I certainly don’t know if this behavior is expected based on how the paint mixer brush is designed, but it’s not consistent with other programs out there like Photoshop, Procreate or Clip Studio Paint.  I actually realized this when the instructor pointed it out in a class on Proko.com. It took me a while to be able to recreate the conditions that cause the fully opaque colors to be produced by the pain mixer brush. 

thanks