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Photoshop Posterization

Posterization (or sometimes called banding) is when you can see the transition from one color to the next or abrupt changes from one tone to another. It sometimes looks like bands of color appear on the image. Posterization appears similar to how the colors may look in a mass-produced poster where the print process uses a limited number of color inks.

In a normal image the colors blend gradually from one color to the next making it impossible for the human eye to tell where one color stops and the next one starts.

Causes

Any process which "stretches" the histogram has the potential to cause posterization. Stretching can be caused by techniques such as levels and curves in Photoshop, or by converting an image from one color space into another as part of color management. The best way to ward off posterization is to keep any histogram manipulation to a minimum.

Detection

Posterization can be seem by visually inspecting the image, but the histogram is the best tool to use to detect posterization.

Steps to Posterize

1. Open an image and bake a back up copy of the layer
   
2. On the Menu Bar, select Layer > New Adjustment Layer > Posterize...
   
3. Photoshop will create a new layer
   
4. Your image has been posterized
   
5. Remember to save your photoshop file which will be a .psd file. Also save your image for the website by going to File > Save for Web & Devices... Since this is an image it should be saved as a .jpg file.
   

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Page last updated: May 31, 2012 15:12 PM