CS781 - Colour for Computer Graphics - Winter 2009

Lecture 20

Reading Colour

Categorical Continuous
Find the right one among a few.

Encoding easy.

Resistant to contrast effects

Find the right one among a continuous distribution.

Precision falls off with distance.

Encoding not easy.

One context Purely perceptual task Easy

Multiple hits resolvable


Colour matching

Several contexts Requires memory: almost the definition Easy

Multiple hits not resolvable


What is a context in this context?

Temporal Context


Spatial Context

Context can be strengthened

Introducing a colour into another context

As a memory

As a sample

As a specification

Colour Scales

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