Colorizing Effect

Step 1: Pick a picture that is a close up. Generally, the picture should be a person but you can pick anything.

Step 2: Once the picture is opened up in Photoshop, go to the right side to a little icon that looks like a graph (Properties)
Step 3: Properties will open up on the right side, adjust that level of light to make the face/object light. Try to make only slightly lighter.
Step 4: Go to Layer-->New Fill Layer-->Gradient
Step 5: Click the rainbow gradient
Step 6: Go to the right, under Layers. You will see the word "Normal". Click on that a scroll all the way down to 'Color'.
Step 7: Once opened, adjust the angle to whatever position you like; Note: 90 degrees, 180 degrees and 360 degrees will be perfectly horizontal or vertical. In between those numbers, you will have a more slanted effect.
Step 8: Flatten image and you're done!