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Gray-centered RGB color space

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RGB color spaces are widely used in image processing. In this paper the authors discuss the use of RGB color space in which the origin is centered in the RGB cube at middle gray. This may appear a trivial difference from the traditional RGB color space in which the origin is at black, yet it is shown that significant advantages accrue from off-setting the origin, as is traditionally done in signal processing with bipolar samples. The geometry of vectors (pixel values) in gray-centered RGB space is described, and related to familiar properties from the hue-saturation-intensity (HSI) representation, which is explained as a different coordinate system, based on RGB. Finally, to illustrate the geometric advantage of centering the origin, the paper presents a simple but effective clipping algorithm for dealing with out of range vectors which can arise from filtering operations applied in RGB space. The effectiveness of the clipping algorithm is demonstrated with some example images.
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Document Type: Research Article

Publication date: January 1, 2004

More about this publication?
  • Started in 2002 and merged with the Color and Imaging Conference (CIC) in 2014, CGIV covered a wide range of topics related to colour and visual information, including color science, computational color, color in computer graphics, color reproduction, volor vision/psychophysics, color image quality, color image processing, and multispectral color science. Drawing papers from researchers, scientists, and engineers worldwide, DGIV offered attendees a unique experience to share with colleagues in industry and academic, and on national and international standards committees. Held every year in Europe, DGIV papers were more academic in their focus and had high student participation rates.

    Please note: For purposes of its Digital Library content, IS&T defines Open Access as papers that will be downloadable in their entirety for free in perpetuity. Copyright restrictions on papers vary; see individual papers for details.

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