The ABC of Input

Scanners, digital cameras, and other input devices always have been designed to separate an image into its RGB components. This tradition is rooted in the need to display the image with little or no processing. With the advent of inexpensive and fast computing, filters can be optimized to eliminate metamerism and to maximize the signal to noise. This paper introduces the concept of the ABC filter. In addition, a new method of calibration is presented that does not use either a single affine transform or colorimetric mapping over a gamut volume.