Hsbhsl Color Model

The HSB (Hue, Saturation and Brightness) or HSL (Hue, Saturation and Lightness) models are not explicitly supported by Photoshop, but are used in various tools such as the Photoshop Color Picker (figure 3-35 on page 83) or the Hue/Saturation tool. The hue is given using an angle from o° to 360°. o° (as well as 360°) corresponds to red, 90° to green, 180° to cyan, and 210° to blue. Saturation has a range from 0% (white) to 100%, while Lightness runs from 0% (black) to 100% (white).

In the Hue/Saturation and Saturation dialogs, saturation values are given in a range from -100 to +100. The same is also true for the Lightness slider. Zero then implies "no change".

You can install a Photoshop extension from the Photoshop CD that provides HSB and HSL as color modes. Figure 3-4: The HSB/HSL color model

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