Bigle 3D is a generator of stereograms, or SIS (Individual Stereogram Image). To create your own stereograms, provide a background, and a greyscale image which will give 3D information. The clearer a zone is, the more it will be close to you in 3D. All is realized in a Wizard. Now, you can record your images in various general formats (bmp, png, jpg, tiff). and even use more image formats for the background and 3D. This tool is free.