Rainbow Brush
The same as the brush, though it cycles the colors while you paint.
This is more of a tool to play around and test colors.
Settings
Change color by
You can choose if the cycling will be done for each pixel, by the speed of the motion or even by time.
Cycle through
What colors do you want the tool to cycle through? The colors of the rainbow? Back and forth between the primary and secondary colors? What about through all the colors of a given palette, in the order they are found in that palette? Try them out!
Selected palette
In case you are cycling through a given palette, here you can choose which palette it is. Tap "Pick" to choose it!
Speed
How fast should the colors change by iteration?
Hue, Saturation and Brightness
The hue the brush will start at on the next stroke, and the saturation and brightness the colors will have.