First Considerations of Default RGB Database

Transmission and reflection test targets enable accurate calibration of input scanning operations. Scanner code values will be easily transformable into tristimulus values (TSVs), or other CIE based colorimetric number systems. However, displaying TSV's directly on a monitor will result in less than desirable images, in terms of both color and neutrality. Converting TSVs to an RGB database, based on the monitor gamma and the chromaticities of monitor phosphors, will result in good colors within monitor gamut and good neutrals; but any truncation of the resulting negative numbers will cause loss of image detail in highly saturated colors and color shifts. There are several image database alternatives, but no single encoding scheme results in minimal computation time, absence of image artifacts, complete device independence and optimal quantization. This paper discusses some of the possible numerical representations for image data, and their advantages and disadvantages.