A perl script, which uses version 2 of the GD library to transform an image. The resulting image consists of random chosen nulls and ones with a color approximating the color of the original picture.
The overall goal of image processing and analysis is the identification of features in data. This often results in a new data volume with voxels labelled in one of only two ways: feature or not feature. This kind of image data is referred to as binary.
Usually a referring to a bitonal image of just black and white (on/off).