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Raquel Bujans Washington University in St. Louis Media & Machines Lab 3 Color Theory
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Raquel Bujans
DKL Color Model
Research advisorDr. Cindy Grimm
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
Washington University in St. LouisMedia & Machines Lab
5Raquel [email protected]
ConesDaylight
See color
3 types: red, green, blue (not exact)
Middle of retina
Washington University in St. LouisMedia & Machines Lab
6Raquel [email protected]
Rods
Low light conditions
Black + white
Peripheral vision
More rods than cones
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)
Washington University in St. LouisMedia & Machines Lab
8Raquel [email protected]
Double-OpponentBlue-Yellow:
Washington University in St. LouisMedia & Machines Lab
9Raquel [email protected]
Double-Opponent
Red- Green:
Washington University in St. LouisMedia & Machines Lab
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Blind spot!
No rods / cones / double-opponent cells in one spot.
That where your optic nerve is!
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
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
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
Washington University in St. LouisMedia & Machines Lab
14Raquel [email protected]
Existing Color Models (HSV)
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
Washington University in St. LouisMedia & Machines Lab
16Raquel [email protected]
Existing Color Models (LUV)
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”
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
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
Washington University in St. LouisMedia & Machines Lab
20Raquel [email protected]
Color Shift TablesRecent work: tables of colors shifted under different color models
