Switching Colors with Replace Color in Photoshop

The Replace Color command creates interesting creative effects by allowing you to substitute one set of colors for another. It does this by building a mask using colors you select and then replacing the selected colors with others that you specify. You can adjust hue, saturation, and lightness of the masked colors. Just follow these steps:
1. Choose Image-->Adjustments-->Replace Color.
The Replace Color dialog box appears.
2. Choose either Selection or Image.
- Selection shows the mask in the preview window. The masked area is black, semitransparent areas are shades of gray, and unmasked areas are white.
- Image shows the full image itself in the preview window. Use this option if you zoomed in on the original image to select colors more easily, but you still want to be able to see the full image in the preview.
3. Click the colors you want to select.
You can click either the image or the preview box.
4. Hold down the Shift key and click or use the plus (+) Eyedropper tool to add more colors.
5. Hold down the Alt key (Option key on the Mac) or use the minus (–) Eyedropper tool to remove colors.
6. To add colors similar to the ones you select, use the Fuzziness slider to refine your selection, adding or subtracting from the selection based on the tolerance value.
7. Move the Hue, Saturation, and Lightness sliders to change them to new values.
8. When you like the result, click OK to apply the settings.