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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. - PowerPoint PPT Presentation
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Homework #4Homework #4
Due 2/19/13
1. Color sliders1. Color sliders
Power point
2a. Plotting on color triangle 2a. Plotting on color triangle
M=0
M=1L=0
L=1
S=0
2b-i) The red – yellow colors don’t 2b-i) The red – yellow colors don’t stimulate the S cones so S=0 and all stimulate the S cones so S=0 and all
the colors are on the L-M axisthe colors are on the L-M axisL
MS
2b-ii) 680 nm light – Nearly all the 2b-ii) 680 nm light – Nearly all the light stimulates just the LWS conelight stimulates just the LWS cone
It is not possible to stimulate just the M or It is not possible to stimulate just the M or S cone so the color lines can’t go to the M S cone so the color lines can’t go to the M
or S vertexor S vertex
255, 0, 0
0, 255, 0
0, 0, 255
LWS>MWS
MWS=LWS
SWS>MWS, LWS
2b-iii
2b-iii. Plotting RGB colors on 2b-iii. Plotting RGB colors on color triangle color triangle
M=0
M=1L=0
L=1
S=0
2b-iv) The monochromatic line2b-iv) The monochromatic line
L
MS
The two perpendicular axes The two perpendicular axes which describe the color which describe the color
opponenciesopponencies
Red – green opponency
They result simply from the way the pigment spectra overlap
4) Protanope - no red cones : all 4) Protanope - no red cones : all long wavelength colors are long wavelength colors are
greengreen
λmax = 420, 535nm
Deuteranope - no green cones : Deuteranope - no green cones : all long wavelength colors are all long wavelength colors are
greengreen
λmax = 420, 565 nm
Protanomoly - red pigment Protanomoly - red pigment shifted towards green: some shifted towards green: some colors at long wavelengthscolors at long wavelengths
λmax = 420, 535, 550 nm
Deuteranomoly - green pigment Deuteranomoly - green pigment shifted towards red: some shifted towards red: some
colorscolors
λmax = 420, 554, 565 nm
Tritanopia: the short Tritanopia: the short wavelength colors are more wavelength colors are more
grey to blue and long colors are grey to blue and long colors are redsreds
5) Josh Silver5) Josh Silver
Description of AdspecsDescription of Adspecs
Liquid has n=1.579Liquid has n=1.579
People do pretty well as self-People do pretty well as self-correctingcorrecting
Notes from Lecture 11Notes from Lecture 11
About HW#4
Long Long wavelengthswavelengths
• M=0 S=0 L=1
• Only LWS cone absorbs light
At no At no wavelength does wavelength does
L=0L=0LWS cone absorbs
light over full visible rangeL>0
Forbidden zone
Just because R and G are 0 does not mean M and L are 0
Different spectra can stimulate the S, M and L cones in same way
Computer blue
Laser blue
Third channelThird channel
• Red - Green channel• Blue - Yellow channel
• Sum of all three cones detects lightnessBlack Black --->---> White channel
If LWS cone covers full spectrum, always one cone working to detect light