1. You will need some image editing software, this includes Photoshop, Photoshop Elements, or other. It needs to have image/color adjustment capabilities. I will be using Photoshop CS2, any photoshop version will make it easy to follow along. 2. You will need a photo to doctor, I will be using one of the sample pictures included in xp called water lillies
Step 2: Open Photoshop
Open Photshop and then go File>Open... then open the file you want to doctor. it should look like the picture below.
Step 3: Create COLOR!!!
Goto Image>Adjustments>Gradient map. Click the box with the already set gradient, another dialog box should pop up. At the top is a bunch of gradients, click the rainbow, if you hover your mouse over it it should say spectrum. Hit okay
Step 4: Reverse color (if wanted)
If you want the image to have the opposite colors click the reverse tick box at the bottom of the gradient map dialog box
Step 5: FINISH
Click ok to get out of the gradient dialog box, and your done, save it as whatever you want.