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1
http://www.physics.unl.edu/~fulcrum/
Department of Physics & AstronomyUniversity of Nebraska-Lincoln
Lincoln NE [email protected]
ColorBy Christine DeVries
2
What isCOLOR?
3 3
The Electromagnetic
Spectrum
4
5
wavelength
6Wavelength(nm)
0.001 0.01 0.1 1 10 100 103 104 105 106 107 108 109 1010 1011 1012 1013 1014 1015
Gamma rays
X-rays
Ultra-violet
Infrared
Micro-wave
EHF
SHF
UHF
VHF
HF
MF
LF
ELF
The Electromagnetic Spectrum
7wavelength(nm)0.001 0.01 0.1 1 10 100 103 104 105 106 107 108 109 1010 1011 1012 1013 1014 1015
Gamma rays
X-rays
Ultra-violet
Infrared
Micro-wave
EHF
SHF
UHF
VHF
HF
MF
LF
ELF
400 nm 500 nm 600 nm 700 nm
The Electromagnetic Spectrum
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9
ColorAddition
Mixing Light
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If I mix red and blue, I will get...
a) brownb) yellowc) magentad) cyan
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Red + Blue =
Magenta!
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If I mix red and green, I will get...
a) brownb) yellowc) magentad) cyan
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Red + Green =
Yellow
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If I mix blue and green, I will get...
a) brownb) yellowc) magentad) cyan
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Blue + Green =
Cyan
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Yellow
Magenta
Cyan
Green
Red
Blue
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+ =
+ =
+ =
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The Additive Primary Colors
Blue
Red Green
R
B
G
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+ =
+ =
+ =
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White Light
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White Light
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White Light
?
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White Light Yellow Light
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White Light Yellow Light
Yellow = Red + Green
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White Light Yellow Light
Yellow = Red + Green
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Yellow and Blue are complimentary
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Yellow and Blue are complimentary
If you add yellow light and blue light, you get white light
+ =
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+ =
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+ =
+ =+
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Yellow
Magenta
Cyan
Green
Red
Blue
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Complimentary colorsand
and
and
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ColorSubtraction
Mixing Pigments
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The Subtractive Primary Colors
Yellow
Cyan Magenta
C
Y
M
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White Light Yellow Light
Yellow dye absorbs all colors EXCEPT yellow
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White Light Yellow Light
= Red + Green
Yellow dye absorbs all colors EXCEPT yellow
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White Light Yellow Light
= Red + Green
Yellow dye absorbs all colors EXCEPT yellow
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White Light
cyan dye absorbs all colors EXCEPT cyan
Cyan Light
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White Light
cyan dye absorbs all colors EXCEPT cyan
Cyan Light= Blue + Green
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White Light
yellow dye + cyan dye leaves ???green!
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ue
Green
Blue
Red
Yellow
Cyan
Magenta
43wavelength(nm)0.001 0.01 0.1 1 10 100 103 104 105 106 107 108 109 1010 1011 1012 1013 1014 1015
Gamma rays
X-rays
Ultra-violet
Infrared
Micro-wave
EHF
SHF
UHF
VHF
HF
MF
LF
ELF
400 nm 500 nm 600 nm 700 nm
The Electromagnetic Spectrum
44
Yellow
Magenta
Cyan
Green
Red
Blue
45
ue
Green
Blue
Red
Yellow
Cyan
Magenta
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Complimentary colorsand
and
and
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The National Science FoundationCenter for Materials Research & Analysis
Center for Electro-OpticsCenter for BioTechnology
Department of Physics & AstronomyDepartment of Chemistry
Department of Electrical Engineering
Thanks To
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White Light
red dye absorbs all colors EXCEPT red
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White Light
green dye absorbs all colors EXCEPT green
50
White Light
red dye + green dye absorbs ???all colors!
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White Light
cyan dye + green dye absorbs ???
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White Light
cyan dye + green dye absorbs ???