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DKL Color Model. Raquel Bujans. Research advisor Dr. Cindy Grimm. Color Theory. How your eye sees light: Light reflects off object Enters eye, retina Processed by brain Physical process: Rods Cones Double-opponent cells. Color Theory. Color Theory. Daylight See color

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DKL Color Model

Raquel Bujans

Research advisor

Dr. Cindy Grimm


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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. Louis

Media & Machines Lab


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Color Theory

Washington University in St. Louis

Media & Machines Lab


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Color Theory

Washington University in St. Louis

Media & Machines Lab


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Daylight

See color

3 types: red, green,

blue (not exact)

Middle of retina

Cones

Washington University in St. Louis

Media & Machines Lab


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Low light conditions

Black + white

Peripheral vision

More rods than cones

Rods

Washington University in St. Louis

Media & Machines Lab


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Circular

Types

Red – green

Blue – yellow

Make both colors seem brighter when next to each other (hard time seeing boundary)

Double-Opponent

Washington University in St. Louis

Media & Machines Lab


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Double-Opponent

Blue-Yellow:

Washington University in St. Louis

Media & Machines Lab


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Double-Opponent

Red- Green:

Washington University in St. Louis

Media & Machines Lab


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No rods / cones /

double-opponent cells in

one spot.

That where your optic

nerve is!

Blind spot!

Washington University in St. Louis

Media & Machines Lab


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http://www.psych.ucsb.edu/~rowe/SimultaneousContrast.html

http://www.psych.ucsb.edu/~rowe/SuccessiveColorContrast.html

Fun Tricks

Washington University in St. Louis

Media & Machines Lab


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RGB: red, green, blue

Additive (all 3 together = white light)

Based on additive primary colors

Can’t represent all visible colors

TV, monitors

Existing Color Models (RGB)

Washington University in St. Louis

Media & Machines Lab


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HSV: hue, value, saturation

Hue means “color”

Value means “brightness”

Saturation means “vibrancy” or “purity”

More perceptually intuitive

Existing Color Models (HSV)

Washington University in St. Louis

Media & Machines Lab


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Existing Color Models (HSV)

Washington University in St. Louis

Media & Machines Lab


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LUV: luminance, chromacity

Tries to represent more colors than RGB

Can represent all visible colors

Designed to be more accurate

Existing Color Models (LUV)

Washington University in St. Louis

Media & Machines Lab


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Existing Color Models (LUV)

Washington University in St. Louis

Media & Machines Lab


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DKL: red-green, blue-yellow, intensity

Reasons why:

New methods for artistic control

Based directly off eye’s physical process of “seeing”

New Model - DKL

Washington University in St. Louis

Media & Machines Lab


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Paint more warm/cool

Ex: paint sunrise  sunset

Each color shifts differently

Ex: red  blue VS. green  blue

Easy to change: adjust blue-yellow channel

Control intensity

Intensity affects color

http://www.psych.ucsb.edu/~rowe/Bezold-Brucke.html

Why DKL is Better

Washington University in St. Louis

Media & Machines Lab


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In touch with the way we see light

Models behavior of cones, rods, and double opponents

Represents more colors

Color interaction more correct

Why DKL is Better

Washington University in St. Louis

Media & Machines Lab


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Recent work: tables of colors shifted under different color models

Color Shift Tables

Washington University in St. Louis

Media & Machines Lab


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? models

Questions?

Washington University in St. Louis

Media & Machines Lab


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