"Stuart Pedazzo" wrote
I want to create an image of the backside of a DVD or CD. I have tried scanning a CD in a scanner but got an undesirable image.
Does anyone have a good tutorial on how to achieve the radial spectrum effect you see when you look at the back of a CD?
You've got all the pieces. Here's how to get the effect.
1) create a square image whose dimensions match the diameter of your final CD
2) lay down a horizontal gradient, with each color repeated twice. I did this using two repetitions of the spectrum gradient
3) white out the upper 1/6 or so of the square. This will form the circle in the center of the CD
4) apply Filter>Distort>Polar Coordinates, with the rectangular to polar coordinates selected
This will get your circular CD effect. You may want to refine things by defining your own gradient - typically the cyan or neutral band of the gradient is much larger than the others. Make the center hole more accurate by adding a couple of horizontal lines. Add a new layer in lighten mode with a radially distorted white patch to simulate a reflection. Create a fine horizontal texture by transforming a 1 pixel wide column of white noise, distort, and add that as a darken layer between the gradient layer and the reflection.
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Mike Russell
www.curvemeister.com