This makes parts of your picture two colors: white, and the color chosen in the palette — i.e., if you choose black, you'll get a black and white picture; no shades or dithering are used. (This is also known as a "threshold" effect.)
This tool offers both freehand and one-click operation.
This tool offers multiple size settings.
This tool offers color choices.
See also: Dither & Dither (Keep Colors).
Tux Paint 0.9.34