Creating a synthetic rainbow effect

In this exercise, I will show you how to create a synthetic rainbow effect…inside of Photoshop.…one that actually looks pretty darn good as you can see here inside of this…final version of the composition.…I've saved my changes as More subtle highlights.psd found inside the…06_color_range folder.…Now, the first thing I am going to do is click on the Background layer to make…it active and we need to create a new layer to hold our rainbow.…So press Ctrl+Shift+N or Command+Shift+N on the Mac.…Name the layer rainbow and then click OK.…

Now, I need to draw a rectangle, and fill it with a rainbow gradient, and I…am going to do that by dialing in some very specific values for my…Rectangular Marquee tool.…So go ahead and select the Rectangular Marquee, change the Style to Fixed Size,…and the values I came up with were 1840 for the Width because that's the entire…width of this particular image and then 187 for the Height.…Now, you don't have to follow these exact values.…But again, these are the values required to get the final effect.…