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Homework #4

Homework #4. Due 2/19/13. 1. Color sliders. Power point. 2a. Plotting on color triangle. L=1. M=0. S=0. L=0. M=1. L. 2b-i) The red – yellow colors don ’ t stimulate the S cones so S=0 and all the colors are on the L-M axis. M. S.

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Homework #4

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  1. Homework #4 Due 2/19/13

  2. 1. Color sliders Power point

  3. 2a. Plotting on color triangle L=1 M=0 S=0 L=0 M=1

  4. L 2b-i) The red – yellow colors don’t stimulate the S cones so S=0 and all the colors are on the L-M axis M S

  5. 2b-ii) 680 nm light – Nearly all the light stimulates just the LWS cone

  6. It is not possible to stimulate just the M or S cone so the color lines can’t go to the M or S vertex

  7. 2b-iii 255, 0, 0 LWS>MWS MWS=LWS 0, 255, 0 SWS>MWS, LWS 0, 0, 255

  8. 2b-iii. Plotting RGB colors on color triangle L=1 M=0 S=0 L=0 M=1

  9. L 2b-iv) The monochromatic line M S

  10. The two perpendicular axes which describe the color opponencies They result simply from the way the pigment spectra overlap Blue-yellow opponency Red – green opponency

  11. 4) Protanope - no red cones : all long wavelength colors are green λmax = 420, 535nm

  12. Deuteranope - no green cones : all long wavelength colors are green λmax = 420, 565 nm

  13. Protanomoly - red pigment shifted towards green: some colors at long wavelengths λmax = 420, 535, 550 nm

  14. Deuteranomoly - green pigment shifted towards red: some colors λmax = 420, 554, 565 nm

  15. Tritanopia: the short wavelength colors are more grey to blue and long colors are reds

  16. 5) Josh Silver

  17. Description of Adspecs

  18. Liquid has n=1.579

  19. People do pretty well as self-correcting

  20. Notes from Lecture 11 About HW#4

  21. Long wavelengths • M=0 S=0 L=1 • Only LWS cone absorbs light

  22. At no wavelength does L=0 LWS cone absorbs light over full visible range L>0 Forbidden zone

  23. Just because R and G are 0 does not mean M and L are 0

  24. Laser blue Different spectra can stimulate the S, M and L cones in same way Computer blue

  25. If LWS cone covers full spectrum, always one cone working to detect light Third channel • Red - Green channel • Blue - Yellow channel • Sum of all three cones detects lightness • Black ---> White channel

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