(MyPaint is the latest AppImage, unless there’s some very recent one, Debian Buster/Sid GNU Linux, running on some crazy Openbox, I guess the “DE” variable may be KDE, though, because I prefer mostly QT apps. Wacom bamboo “boring,” the not-fun version, whatever is its name besides “bamboo.”)
I have this brush, a custom-made one, derived from some old ones of the “Ico-dY” family, I guess specifically “OC Brush,” and the “problem” is reproduced on that too. Between quotes because it’s something I don’t like, even though it may be on purpose.
What happens is that color may be set to 100% black, with no hue whatsoever, on the white scale, but whenever you momentarily hover the cursor over some colored area (on the same layer), when you first start drawing, it would have grabbed some of that color, and “tint” the color you’ve set for a little while. I think it’s more noticeable the darker the value of the actually chosen color is, and particularly in pure black, but it will affect hues as well.
All the “color” settings of said brushes are set to “0,” though. I think a couple of them had some “random color” setting, but I’ve set it to 0 and saved. Does anyone know what other setting could be changed to eliminate this effect?