To create a 3D image that is comparable with the anaglyph glasses you must do as follows:
Import your image into Photoshop,
Duplicate it,
Go image, adjustments, curves.
In the curves menu Change the red channel to "output: 0" and "input: 251", them click ok.
Click on the other duplicated layer and go again to the curves dialogue box, but this time change the Green and Blue channels and apply the same input and output as the the Red to both.
To the layer on top in the layers pallet set the blending mode to screen.
The final step is to put on your glasses and adjust the position of the layers to get the depth that you want.
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