Tips about editing a depth-image
You can create a depth-image by any graphic editors, such as Microsoft Paint and Adobe photoshope,and the images had better in grayscale mode, saved as bitmap files.
Tips:By using a color shades from white into black, you can create a surface recede into the distance, as shown below.
From V3.02,Stereogram magician provide a depth-image editor, it's very similar to the Window painter, but some different. The depth-image editor provide a grayscale palette and some useful filters.