Color and visualization specific color meanings keep

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Color and Visualization Specific color meanings: keep it limited Color scales are hard to interpret – Heat scale is one that of the few that partially works Limits of color reproduction can change the message
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Color Image Processing General approaches Process RGB color planes separately • Simple Not always meaningful thinking in RGB Convert to HSI or other color space with explicit intensity component Process the intensity component as you normally would May process the saturation Generally want to leave the hue alone in this model Design transformation in intensity/chromaticity space, but implement through direct RGB manipulation
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Processing RGB Planes
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Processing Other Components
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Color Transformations
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Color Transformations Can change channels together to transform the intensities
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Color Balancing Or you can change channels separately Can emphasize or de-emphasize one or more channels
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Color Histogram Equalization Convert to HSI or similar space • Process – Histogram equalize the intensity plane – Increase the saturation – Leave the hue plane unchanged Convert back to RGB for display
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Color Histogram Equalization
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Summary Pick a color space that makes sense for your application If the application is interactive, consider using HSI or other color space with explicit intensity/chromaticity If you want to process intensities but keep hues the same, work (or at least think) in that kind of color space Keep physical limitations in mind Primaries, different color gamuts, etc. There’s a lot more to color than RGB triplets!
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  • Winter '08
  • Morse,B
  • Indexed color

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