CS781 - Colour for Computer Graphics - Winter 2009
Lecture 19
Decorating with Colour
The Power of Colour
- The electrical wire
- Effects based on attention
- Effects that do not require attention
Baby Decoration I
A million books on how to decorate with colour
- Start with a colour you like
Excursion: Colour and Mood
Energy Level
- Hot colours
- Warm colours
- Cool colours
- Cold colours
Illumination versus Reflection
Baby Decoration II
Use the starting colour as the basis for a colour scheme
A million books with sets of colours that go together
- with mood/feeling attached by words
Excursion: Colour Design
Creating sets of colours
- Supplementary colours
- Complementary colours
- Split complementary colours
Colour mixing models
- additive
- subtractive
- important role of white and black
Baby Decoration III
Large areas of colour
- Increase of saturation with area
Coloured objects
- Necessity for luminance contrast in the right places
- Shadows as a method of creating luminance contrast
- Natural versus unnatural colour
- Colour is relative
Case Study: Dynamic Colour Management for Windowing Systems
Windows have many customizable colours
- Background
- Frames
- Menus
- Recurse on the applications within frames and add ...
Colour choice has two important aspects
- Aesthetic
- add pleasure to the users experience
- personalize and give ownership
Functional
- colour relationships
- within the computational experience
- with the real world
- make things easier to use
Contrary to expectations there is minimal interference between aesthetic
and functional colour use.
Aesthetic colour use
- Avoiding things the user dislikes or finds offensive
- Enhancing thigs the user likes
- Complementing the user's choices
Function colour use
- Building associations
- Conveying structural organization
- Enhancing comprehension
Implementation framework
- user-supplied constraints
- interface based on programming by example
- generic bland defaults
- constraints evaluated to supply explicit colours
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