CS781 - Colour for Computer Graphics - Winter 2009

Lecture 12

Measuring Colour

What can be measured?

Power of light emitted from a source in all directions

Power of light enitted from a source in a particular direction

Luminous flux is a property of a ray of light. Remember

Power of light falling on a surface

Power of light falling on a surface from a particular direction

Power of light leaving a surface

Power of light leaving a surface in a particular direction


Creating Colour: Self-Luminous Devices

`Self-luminous' means producing light without an external illuminant.

Colour CRT

Monochrome CRT

What is it?

What light is emitted?

Colour CRT

What is it?

What light is emitted?

Colour LCD

Technological basis

What if we had four filters?

Colour OLED

Solid state photodetectors and LEDs are very closely related


Creating Colour: Illuminated Devices

Half-tone Printing

Photography

Continuous-tone Printing


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