raquel bujans dkl color model research advisor dr. cindy grimm
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Raquel Bujans Washington University in St. Louis Media & Machines Lab 3 Color TheoryTRANSCRIPT
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Raquel Bujans
DKL Color Model
Research advisorDr. Cindy Grimm
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Washington University in St. LouisMedia & Machines Lab
2Raquel [email protected]
Color Theory
How your eye sees light:
Light reflects off object Enters eye, retina Processed by brain
Physical process:
Rods Cones Double-opponent cells
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Washington University in St. LouisMedia & Machines Lab
5Raquel [email protected]
ConesDaylight
See color
3 types: red, green, blue (not exact)
Middle of retina
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Washington University in St. LouisMedia & Machines Lab
6Raquel [email protected]
Rods
Low light conditions
Black + white
Peripheral vision
More rods than cones
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Washington University in St. LouisMedia & Machines Lab
7Raquel [email protected]
Double-Opponent
Circular
TypesRed – greenBlue – yellow
Make both colors seem brighter when next to each other (hard time seeing boundary)
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Washington University in St. LouisMedia & Machines Lab
8Raquel [email protected]
Double-OpponentBlue-Yellow:
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Washington University in St. LouisMedia & Machines Lab
9Raquel [email protected]
Double-Opponent
Red- Green:
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Washington University in St. LouisMedia & Machines Lab
10Raquel [email protected]
Blind spot!
No rods / cones / double-opponent cells in one spot.
That where your optic nerve is!
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Washington University in St. LouisMedia & Machines Lab
11Raquel [email protected]
Fun Tricks
http://www.psych.ucsb.edu/~rowe/SimultaneousContrast.html
http://www.psych.ucsb.edu/~rowe/SuccessiveColorContrast.html
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Washington University in St. LouisMedia & Machines Lab
12Raquel [email protected]
Existing Color Models (RGB)
RGB: red, green, blueAdditive (all 3 together = white light)Based on additive primary colorsCan’t represent all visible colors TV, monitors
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Washington University in St. LouisMedia & Machines Lab
13Raquel [email protected]
Existing Color Models (HSV)
HSV: hue, value, saturation
Hue means “color”
Value means “brightness”
Saturation means “vibrancy” or “purity”
More perceptually intuitive
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Washington University in St. LouisMedia & Machines Lab
14Raquel [email protected]
Existing Color Models (HSV)
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Washington University in St. LouisMedia & Machines Lab
15Raquel [email protected]
Existing Color Models (LUV)
LUV: luminance, chromacity
Tries to represent more colors than RGB
Can represent all visible colors
Designed to be more accurate
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Washington University in St. LouisMedia & Machines Lab
16Raquel [email protected]
Existing Color Models (LUV)
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Washington University in St. LouisMedia & Machines Lab
17Raquel [email protected]
New Model - DKL
DKL: red-green, blue-yellow, intensity
Reasons why:New methods for artistic control
Based directly off eye’s physical process of “seeing”
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Washington University in St. LouisMedia & Machines Lab
18Raquel [email protected]
Why DKL is Better
Paint more warm/coolEx: paint sunrise sunsetEach color shifts differently
Ex: red blue VS. green blueEasy to change: adjust blue-yellow channel
• Control intensity• Intensity affects color• http://www.psych.ucsb.edu/~rowe/Bezold-Brucke.html
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Washington University in St. LouisMedia & Machines Lab
19Raquel [email protected]
Why DKL is Better
In touch with the way we see light
Models behavior of cones, rods, and double opponents
Represents more colors
Color interaction more correct
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Washington University in St. LouisMedia & Machines Lab
20Raquel [email protected]
Color Shift TablesRecent work: tables of colors shifted under different color models