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Changing Color Modes

Before converting your file to a different color mode, it’s a good idea to save a “master” version of your photo first. That way, no matter what changes you make to your image, you always have an untouched backup version, just in case.

The HSB Color Model

The RGB model isn’t the only way to translate and interpret color. For some purposes, it’s useful to describe color in terms of the HSB model. H represents the color’s overall hue (how you’d characterize it in the color spectrum, such as “purple” or “teal”). S stands for saturation, the purity of the color, and B stands for brightness, or how light or dark the color is. Although you can’t convert an image to HSB mode, you can make color selections and changes using either RGB or HSB within the Color Picker (Figure 3.4) and many of the color-adjustment tools covered later in this chapter. Say, for example, you want to color something bluish-green. How do you describe that in terms of red, green, and blue? If you’re working in the HSB model, it’s relatively easy. In the toolbox, click the foreground or background color selection box to access the Color Picker. Using the Color Picker, just click the H button, find the basic color on the Hue slider, and then choose the specific shade from the large square on the left, which shows all the variations of saturation and brightness within that hue.

Figure 3.4. The Color Picker includes access to the hue, saturation, and brightness (HSB) of your image.




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