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The Effect of Gamma and Chroma on the Perception of Color Images

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We present the results of experiments in which we manipulated color images in the CIELAB space by first applying a scaling factor on chroma (C*). After this we applied a gamma transformation (an exponent relating the input to the output) to the luminance (Y) in XYZ space, while keeping the chromaticity values (x, y) constant. The aim of the experiments was to test the subjective preference for a particular gamma and chroma scaling factor.

Two natural images (standard ISO images) were transformed with 4 different values of gamma and 4 different scaling factors for chroma. The images were viewed on a CRT monitor.

We found that the preference depends on the gamma, on the chroma scaling factor and on both variables combined. However, increasing or decreasing one or both variables does not improve the preference for the images that are used.

The results were not significantly different for the two different images.
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Document Type: Research Article

Publication date: January 1, 2002

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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