Getting Colorful with Hue/Saturation in Photoshop

Photoshop’s Hue/Saturation controls let you adjust colors based on their hue, saturation, and lightness. The Hue/Saturation dialog box doesn’t work with the red, green, and blue (or cyan, magenta, yellow, and black) channels of an image. Instead, it operates on the different colors, or hues. You can select all the colors (Master) from the Edit pop-up menu, or choose one color to modify.
Three sliders are in the Hue/Saturation dialog box.
- Hue: Shifts all the colors clockwise or counterclockwise around the color wheel, depending on the direction you move it.
- Saturation: Increases or decreases the richness of the colors in an image.
- Lightness: Modifies the brightness values.

You can adjust any of these values by moving the sliders and watching the results in the image window. The top color bar at the bottom of the dialog box represents the colors in their order on the color wheel before you made any adjustment. The lower color bar shows how the modifications you make affect the colors. When you select an individual color to adjust, sliders appear between the color bars so that you can define the range of color to be adjusted. You can select colors, add colors, or subtract colors from the range by choosing one of the eyedropper tools and clicking in the image.

Using the Colorize option
Use the Colorize option in the Hue/Saturation dialog box to change the color of any selected area to a new, solid color. This is unlike the Hue slider, which changes only individual pixels based on their present color values. Just follow these steps:
1. Open an image and access the Hue/Saturation dialog box by choosing Image-->Adjustments-->Hue/Saturation, or pressing Ctrl+U (or Ô+U on the Mac).
2. Select the Colorize option.
3. Drag the Hue slider in either direction to change a color.
Photoshop doesn’t colorize pure white pixels and pure black pixels because colorization affects only gray pixels (from a brightness value 1 to 254).