The BCC Posterize filter reduces the number of colors in the image by independently reducing the number of discrete levels in each color channel. The resulting output image has a few distinct values of red, green, and blue, instead of having each value spread over the full range of 0 to 255. The ﬁlter also allows you to scramble the output values for additional creative control.
Posterization effects can produce hard edges that give the output image a rough appearance, which can be exacerbated by image compression and by the bandwidth limitations of analog video equipment. The Posterize ﬁlter provides several controls that deal with such problems by blurring and softening the posterized image.
The built in PixelChooser, with integrated mocha planar tracking allows for greater control over which areas of the image the ﬁlter should affect.