Creating a Multicolor Gradient in Photoshop

You can also create a fancier gradient that includes more than two colors. Follow these steps to add a third color:
1. To add a third color, click below the gradient bar at the position you want to place the next color.
A new color stop appears.
2. Define a color for the new color.
3. Click again to add a fourth color.
You can keep going like this for hours.
4. Specify the color for any and all additional color stops.
5. Move the color stops to the left or right to assign proportions for the additional colors.
You can also type in a position for each stop by selecting it and typing a value in the Location box.
6. Adjust the midpoint sliders between the colors.
7. If you change your mind, you can redefine the color or click the Delete button.
You can also remove a color stop by dragging it down from its position on the gradient bar.
8. Click OK to apply the settings to your new gradient.