Photoshop® CS3 Bible

Chapter 18. Mapping and Adjusting Colors

IN THIS CHAPTER

Mapping colors with Invert, Equalize, Threshold, and Posterize

Tweaking colors with Hue/Saturation

Raising and lowering saturation levels

Colorizing grayscale images

Correcting colors with the Replace Color, Selective Color, Variations, Photo Filter, and Match Color commands

Using the Histogram palette

Boosting brightness and contrast levels

Using the new Black and White adjustment tools

Editing specific color values with Curves

Using the Shadow/Highlight command

Fixing exposure problems

Correcting multiple layers at once with adjustment layers

Color mapping is a term that doesn't really explain itself. Both of the words make sense, but paired up, what to do they mean? Maybe color converting might be a better term, or perhaps color organization or assignment. Anyway, we're stuck with color mapping, at least in a technical sense, and the term simply refers to the process of shuffling colors around, taking them from where they are now to where you want or need them to be. For example, to map Color A to Color B simply means to take all the A-colored pixels and convert them to B-colored pixels. Photoshop provides several commands that enable you to map entire ranges of colors based on their hues, saturation levels, and most frequently, brightness values. They've even added a new one — Black and White — that we'll delve into later in the chapter.

Color Effects and Adjustments

You may want to change colors in your photos and other artwork for ...