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Lecture 7

Lecture 7.docx

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Western University
Psychology 2115A/B

Lecture seven 10/15/2012 11:24:00 AM Colour and brightness continued... The colour wheel  represent colours that we see in a circular fashion  white is represented in the middle of the circle  a colour is not fully saturated as it gets closer to the middle (mix of many colours- not pure)  brightness is represented when you cut the wheel in half (the higher you go, the brighter it is –narrows at the top and bottom), as colours get brighter, the more restricted you are to get a fully saturated colour (less saturated) this is the same when you get darker What happens when you mix colours?  Picture red on the top and orange in the middle and yellow on the top- the line shows you how the two colours are connected, and the proportion of the colours that are used  It also shows you the saturation of the colour  Gives you a prediction of what people will see (red and yellow mixed- they see orange  If the dot was moved slightly up the line you will see more red than yellow (a darker red), same as if you were to move closer to yellow (you would see more yellow)  White is all the light waves together (mix more colours the closer to the middle you will get)  If you mix colours that are directly opposite of one another, you can’t create a new colour- the dominate wave length will always be one colour –THEY ARE COMPLEMENTARY  You only get a new colour if they are beside or near one another Helmholtz  Responsible for discovering the fact that if you take three colours you can create any other colour  They thought that they were red green and blue - PRIMARY  In fact they don’t have to be these three colours, you can pick them at random as long as they are far enough apart (you cant use red orange and yellow, they need to be spread out more)  Why do you see a shirt as red?- because the shirt is an absorber of colour and only the red wave length is reflected to your eye  Mix paint: same idea, absorber of wave lengths –example green and blue, blue and green only reflect off the paint, all of the rest are absorbed, when mixed there is an intermediate that neither paint absorber’s- that is the colour that the paint is How does your visual system work?  What happens to the cones?  There were two theories: o 1. Helmholtz: thought that we have three kinds of cones  had a green, blue and red cone  each cone perceived each specific colour, mixed colours were mixing of the cones  we do have three different cones that are more sensitive to these colours:420nm (blue), 530nm (green), 560nm (yellow)  not specific, they do have a range –once out of the range they wont respond at all  colour blindness: cones aren’t working  experiment in England: found people that couldn’t see blue (only 7 people in all of England) and in fact they didn’t have the blue cone this is called DICHROMACY o 2. Hering: thought that there were four basic colours (red, blue, green and yellow)  he said that there were 4 different cones  he said that some colours don’t co-
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