Black and White in Photoshop CS4 and Photoshop Lightroom IX. Digital Darkroom Editing Dangers Posterization aka Banding Posterization is a tonal separation that occurs when an image has been edited or manipulated to extremes, or if the bit depth of an image has been decreased so much that it has a visual impact on the image quality. Posterization is the loss of tones within an image that results in abrupt transitions between tones that appear as stripes or "banding" in areas which should have smooth gradations between tones. Typically extremely visible in skies, posterization 62 © Leslie Alsheimer