With Posterizer, photos' hue and luminosity can easily be posterized (turning a region of a photo with continuous gradiation into fragments with fewer tones).

Plus, with Posterizer, you can choose to preserve the saturation of the picture while posterizing the hue.

Here are some key features of "Posterizer":

· Preserve Saturation: it is recommended to leave this option marked, except when you're looking for a strict posterization of the luminosity (to the detriment of the colour).
· Posterize: controls the number of levels for the posterization of the luminosity.
· Strength: intensity associated to the posterization of the luminosity.
· Primatize: intensity associated to the posterization of the hue. The posterization of the hue is limited to three levels only.
· Shift: varies the three basic hues associated to the posterization of the hue.

Requirements:

· Adobe Photoshop