Step 3: Set The Dark Areas In The Image To Red

When Photoshop's Gradient Editor appears, you'll see another gradient preview area in the bottom half of the dialog box. We're going to change the colors of the gradient, starting with the black color on the left. Double-click on the black color stop on the bottom left of the gradient preview area:

This brings up Photoshop's Color Picker. Choose a nice red color for the dark areas of the image:

You'll see all the dark areas of your image become red in your document window:

Click OK to exit out of the Color Picker when you're done, but don't exit out of the Gradient Editor just yet. We still have to change the color for the light areas.

Step 4: Set The Light Areas In The Image To Yellow

Next, we're going to change the color of the light areas in the image. Double-click on the white color stop on the bottom right of the gradient preview area:

The Color Picker will appear once again. This time, choose a bright yellow for the light areas:

Click OK to exit out of the Color Picker once you've chosen your color. If we look at our gradient preview area in the Gradient Editor now, we can see that we've changed the gradient from black and white to red and yellow, with Photoshop blending the two colors together for us, giving us a nice orange color in the mid-tones:

Click OK to exit out of the Gradient Editor at this point, and then click OK to exit out of the Gradient Map dialog box as well. Here's what our image looks like now after editing our gradient:

Unfortunately, the colors aren't really blending in with the photo all that well, but we're going to fix that using Photoshop's layer blend modes and the Opacity option next!