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Color Images CS/BIOEN 4640: Image Processing Basics April 5, 2012 - PowerPoint PPT Presentation

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Color Images CS/BIOEN 4640: Image Processing Basics April 5, 2012 RGB Color Space Source: Wikipedia Additive vs Subtractive Color Models Additive Color Model Subtractive Color Model Visible Light Spectrum Monochromatic colors are light

  1. Color Images CS/BIOEN 4640: Image Processing Basics April 5, 2012

  2. RGB Color Space Source: Wikipedia

  3. Additive vs Subtractive Color Models Additive Color Model Subtractive Color Model

  4. Visible Light Spectrum ◮ Monochromatic colors are light at a single wavelength ◮ Some colors (cyan, pink, ...) cannot be represented by a single wavelength ◮ These colors are a mixture or spectrum of wavelengths Source: Wikipedia

  5. CIE XYZ Color Space

  6. CIE XYZ Color Space 0.9 520 0.8 540 0.7 560 0.6 500 580 0.5 y 0.4 600 620 0.3 0.2 480 0.1 460 0.0 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 x

  7. MacAdam Ellipses Source: Wikipedia

  8. Gamut Maximum range of colors a display device (monitor, projector, etc.) can reproduce. Source: Wikipedia

  9. Hue/Saturation/Value (HSV) Source: Wikipedia

  10. Hue/Luminance/Saturation (HLS) Source: Wikipedia

  11. Converting RGB to Grayscale Simple average: Y = R + G + B 3 Better weights for perception: Y = 0 . 299 R + 0 . 587 G + 0 . 114 B

  12. Exploring Colorspaces in ImageJ Check this out: http://imagej.nih.gov/ij/plugins/ color-inspector.html

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