homework #4
DESCRIPTION
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 PresentationTRANSCRIPT
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Homework #4Homework #4
Due 2/19/13
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1. Color sliders1. Color sliders
Power point
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2a. Plotting on color triangle 2a. Plotting on color triangle
M=0
M=1L=0
L=1
S=0
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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
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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
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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
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255, 0, 0
0, 255, 0
0, 0, 255
LWS>MWS
MWS=LWS
SWS>MWS, LWS
2b-iii
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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
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2b-iv) The monochromatic line2b-iv) The monochromatic line
L
MS
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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
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4) Protanope - no red cones : all 4) Protanope - no red cones : all long wavelength colors are long wavelength colors are
greengreen
λmax = 420, 535nm
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Deuteranope - no green cones : Deuteranope - no green cones : all long wavelength colors are all long wavelength colors are
greengreen
λmax = 420, 565 nm
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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
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Deuteranomoly - green pigment Deuteranomoly - green pigment shifted towards red: some shifted towards red: some
colorscolors
λmax = 420, 554, 565 nm
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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
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5) Josh Silver5) Josh Silver
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Description of AdspecsDescription of Adspecs
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Liquid has n=1.579Liquid has n=1.579
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People do pretty well as self-People do pretty well as self-correctingcorrecting
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Notes from Lecture 11Notes from Lecture 11
About HW#4
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Long Long wavelengthswavelengths
• M=0 S=0 L=1
• Only LWS cone absorbs light
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At no At no wavelength does wavelength does
L=0L=0LWS cone absorbs
light over full visible rangeL>0
Forbidden zone
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Just because R and G are 0 does not mean M and L are 0
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Different spectra can stimulate the S, M and L cones in same way
Computer blue
Laser blue
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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