Posterization is what happens when the color border lines in photographs can actually be seen. Normally the eye can't tell where one color in a photograph begins and another ends. When posterization occurs, it usually results in thick bands in the photograph. However, as long as you have photo editing software, you can fix the problem in a few minutes.
Instructions
1. Open Photoshop and import the photo with the posterization into the program. Open the photo in the program.
2. Click on the "Layer/New Layer" tab to create a new layer.
3. Uncheck the "Clipping Mask" checkbox.
4. Enter a new name for the layer, such as "Posterization" in the text box.
5. Use your mouse to move the new layer to the top of the layer's palette.
6. Select the new layer and hold down the "Alt" key ("Option" key on a Mac) and click the "Layer/Merge Visible" tab. The layer will now be a duplicate of everything below it.
7. Add noise to this layer by clicking "Filter/Noise/Add." Select a small amount of noise to add when prompted, such as 3 percent.
8. Look at the distribution control and make sure it is set to "Gaussian."
9. Click on the "Add Mask" option to add a mask to the photo, so only the banded areas are affected by the noise you have added.
10. Click on "Sharpening" to add a sharpening layer to the mask. The posterization is now fixed.
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