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Chapter 18. Correcting Color and Saturat... > Adjust Hue, Saturation, and Lightnes...

146. Adjust Hue, Saturation, and Lightness Manually


A pixel's color value is defined by three components: hue, saturation, and lightness (or luminance, or luminosity). A pixel's hue represents its location on the color wheel, which is the entire spectrum of colors in the computer's gamut or colorspace. Saturation defines the relative power of that hue within a pixel—quantifying, for instance, the range between a clear red (full saturation) to a colorless gray (no saturation). Lightness defines the amount of white in a pixel, from black (no light) to white (all light) to somewhere in-between (light pink). To make individual adjustments to these components of pixels within a given region, use the Adjust Hue/Saturation command. For example, many images taken with digital cameras seem to lack saturation. A boost of saturation by even a few degrees can revive an otherwise dull image, infusing it with excitement and drama.


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