The technique you described only shifts the red channel, so all the "greyscale" information belongs to the green channel. I use another method which you can see in my "The Archeresse - Anaglyph Stereogram" in the gallery. Here's how: 1. Render two images just as you described. 2. Open them in Photoshop and make one image with two layers out of them. 3. Do "Image/Adjust/Hue Saturation" and colorize each layer with 75% saturation and -50 brightness. Use a red hue for the left eye layer and a blue/green hue for the right. 4. In the layers tool window, set the mode to "screen" to combine the layers. 5. Flatten the image and save it. I think this way preserves the information for the left and right eyes better. You decide.