Please note: Most DNG4PS2 users will never need to use the calibration function. Calibration is only required when: * Adding support for a camera * Refining the color matrix for a currently supported camera DNG4PS-2 converts CHDK RAW files into the more widely acceptable DNG format. To do this it needs to understand the color range produced by the camera to allow programs to interpret the picture correctly. Helping DNG4PS-2 understand a camera's color range (gammut) is a process referred to as calibration. Calibration is a three step process: