Color grading is an important process for various industries such as food processing,
fruit and vegetable grading, etc. Quality and price are often determined by the color of product. For example, darker red color for apples means higher price. In color machine vision applications, image is acquired with a color CCD camera that outputs color information in three channels, red, green, and blue. When grading color, these three primary colors must be processed to determine the color level for separation.  The biggest challenge is to allow the user to determine color preferences by simply adjusting a linear threshold of color levels.

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1. D.J. Lee, "Color Space Conversion for Linear Color Grading", Proceedings of SPIE Intelligent Robots and Computer Vision XIX, vol. 4197, p. 358-366, Boston, MA, USA, November 2000.