This command can be used to apply a solarization effect to the specified
brush. The solarization effect tries to simulate the look of photographic
film exposed to light. The second argument controls the intensity of the
solarization effect and can be any value between 0 and 255, or a percentage
specification inside a string.
Note that if
id specifies a palette brush,
just solarize the palette colors which makes this function
really fast when used with palette brushes.