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In 2.79 I can draw individual pixels by setting the brush size to 1px, like in this example (16x16px image): enter image description here

Starting from 2.80 the drawing produces extra pixels: enter image description here

As you can see the antialiasing is disabled, I also tried to tweak all the other settings, but wasn't able to achieve 2.79 behavior.

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    $\begingroup$ I'd recommend submitting a bug report on this - there is no place I can find that allows to adjust something to turn it on or off, and this behavior is not correct. $\endgroup$ – Craig D Jones Oct 13 '20 at 17:18
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    $\begingroup$ @CraigDJones OK, thanks... created developer.blender.org/T81693 $\endgroup$ – Jan Kadeřábek Oct 14 '20 at 0:04
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    $\begingroup$ So this turned out to be a known bug for almost a year now :/ developer.blender.org/T71403 $\endgroup$ – Jan Kadeřábek Oct 14 '20 at 9:45
  • $\begingroup$ Does that give you a solution in turning the Falloff to 'Constant'? $\endgroup$ – Craig D Jones Oct 14 '20 at 16:14
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    $\begingroup$ @CraigDJones OK, but I really need just 1 pixel drawing, like in 2.79. There is even a fix for that developer.blender.org/D6209, unfortunately developers didn't include it to the build, not sure why. $\endgroup$ – Jan Kadeřábek Oct 14 '20 at 20:38
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Do the same falloff as shown here

Starting from 2.80 to NOT produce extra pixels, you can change brush falloff graph in way shown on the gif above.

Make a sharp transition from brush center to it edges.

As you can see radius is setted to 1px, Anti-Aliasing is disabled, 4x4px texture size.

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