Lecture 5 - 24.01.11

Lecture 5 - 24.01.11 - 24 th January 2011 Psych 120B –...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 24 th January 2011 Psych 120B – Lecture 5 Perceiving Colour I. Basic Concepts I I. Some Colour Phenomena I I I. How does colour experience relate to wavelength? IV. Basic Mechanisms V. General Theories of Colour Vision VI. Colour constancy, reflectance, adaptation Basic Concepts • Physics o Colour of a surface is determined by light reflected away by the surface. It is not something inherent to the object, unlike texture. • Relevant dimensions of light – influences what we perceive o Wavelength o Wavelength purity vs. broadband composition How much the wavelength is mixed with other wavelengths. Physics of Light • White natural light o Has all visible wavelengths with equal contributions (broadband because it is a broad wavelength of light) • Colour of a surface o Is the “colour” of light reflected away by the surface (the rest of light is absorbed) Basic Concepts • Psychological Dimensions o Hue – related to wavelength (relation is not simple) o Saturation – relates to the purity or selectivity of hue (how much white is mixed in) o Brightness – not confined to the experience of colour, even grey stimuli can be calculated by brightness. It is how much light you can see. Saturation • Ex. Difference between red and pink .. and really really light pink o Pink is a less saturated version of red. The more white you add, the less saturated the colour is. Colour Picker in Adobe Photoshop • Usually allow you to pick hues and then adjust the saturation (purity) and brightness....
View Full Document

This note was uploaded on 03/07/2011 for the course PSYCH 120B taught by Professor Shams during the Winter '09 term at UCLA.

Page1 / 4

Lecture 5 - 24.01.11 - 24 th January 2011 Psych 120B –...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online