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Computer Graphics Systems Color principles

Donald House Artist’s slides by Lynette House. Computer Graphics Systems Color principles. Color from Physics Viewpoint. Color from Physiological Viewpoint. 3 cone response curves Luminance efficiency. Color from Artist’s Viewpoint. Hue Saturation Value. Hue - Paint Mixing.

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Computer Graphics Systems Color principles

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  1. Donald House Artist’s slides by Lynette House Computer Graphics SystemsColor principles

  2. Color from Physics Viewpoint

  3. Color from Physiological Viewpoint 3 cone response curves Luminance efficiency

  4. Color from Artist’s Viewpoint • Hue • Saturation • Value

  5. Hue - Paint Mixing • Physical mix of opaque paints • Primary: RYB • Secondary: GOV • Neutral: R + Y + B

  6. Hue - Ink Mixing • Subtractive mix of transparent inks • Primary: CMY • Secondary: RGB • ~Black: C + M + Y • Actually use CMYKto get true black

  7. Hue - Ink Mixing Assumption: ink printed on pure white paper CMY = White – RGB: C = 1 – R, M = 1 – G, Y = 1 – B CMYK from CMY: K = min(C, M, Y) C = C – K, M = M – K, Y = Y - K

  8. Hue - Light Mixing • Additive mix of colored lights • Primary - RGB • Secondary - CMY • White - R + G + B • Show demonstration of optical mixing

  9. Saturation • Purity of color

  10. Value • Luminance • Dark to Light • Value range • High key • Middle key • Low key

  11. RGB Color Wheel • Warm/Cool • Complements • Split Complement • Analogous

  12. HSV Color Model HSV is a projection of the RGB space RGB cube HSV top view HSV cone

  13. HSV Color Model Hue, an angular measure (0 - 360)‏

  14. HSV Color Model Saturation, a fractional measure (0 - 1)‏

  15. HSV Color Model Value, a fractional measure (0 - 1)‏

  16. CIE 1931 Study Color Matching Experiment

  17. CIE Color Matching Functions CIE RGB Matching Functions CIE XYZ Matching Functions

  18. RGB from Spectrum RGB = x d

  19. XYZ from Spectrum XYZ = x d

  20. CIE xyY from CIE XYZ • CIE xyY color model is used to catalog colors: • x = X / (X + Y + Z)‏ • y = Y / (X + Y + Z)‏ • Y = luminance

  21. CIE xyY Color Cone

  22. CIE xyY Typical Display Gamut

  23. CIE Lu*v* and Lab Perceptually Uniform Spaces Lu*v* rescales xyYLab color opponents

  24. Color Picker

  25. End

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