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http://www.physics.unl.edu/~fulcrum/
Department of Physics & AstronomyUniversity of Nebraska-Lincoln
Lincoln NE 68588-0111fulcrum2@unl.edu402-472-8685
ColorBy Christine DeVries
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What isCOLOR?
3 3
The Electromagnetic
Spectrum
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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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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
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Yellow
Magenta
Cyan
Green
Red
Blue
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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
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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 ???
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