PSY280 JULY 19.docx

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PSY280 JULY 19, 2012 COLOUR PERCEPTION No such thing as colour, colour is pscyologoiccal, wv is physical no pshy property of colour, property wv not of colour Addition and substraction How perceive stimuli diff colou Trci – cones, how photo receptors responsible for color, Why do we have color vision - Many functions - Onebc we are all visual - Prdeom visual areas - Aesthetics, when we get dressed - Attracted to color, color in homes - Decorate - Color preference we like colour pleasing to the eye aesthic - Things taste better when colorful, wont colour art foods that are black blue or – bc ass with rotten food, not get if color diff - Atteacted to green like healthy, red and brown when look at food chart eat a lot of - Bread more intense for colour - Also a symbolic function, such as when driving red stop, green go, yellow slow, ertain ass between colouts - Eastern culture, lwhite ending, western white birth - Key to personality bright extra and dark intro, not ass but use cues - Also related to mood colours to describe mood, green envy, descriptive for mood - Why bc colour see and mood feel - Interior decoraote and interior designers - Like restaurant –use red, red stimulates appetite, red room more eat the neutral such as logo of food - Red related to winning teams, boxers red then others, red also shown increase aggression, speed and agility increases sensies - Blue tranquility seen in office increase concentrraion not dim or bright middle, increases concentration - Yellow – stim high energy or metabolsom like kitche - Green health and tranquility - Purple calming color - And more fem color and mas, pink fem, blue more masc - Pink inprisons more calming – later not case in prison inmantes - Colour important and impact mult domains in life Purpose - Discrimate - Identify two reasons - Colour shape more better to dis on shape and idenidy what it is then black and white, - Visual search, berries in bush, berries red better then green, color is adaptive search food more efficiently - Orange and grapefruit better discriminate bc grape yellow and orange orange, - Colour add disc and identify Col and light - What can we see in visible light - Cosnists of wv 400 – 700 - See in terms of colout, not colour but how perceive - Absorb many darker, reflect light or lighter - Different colouts bc abosrbation Prisms and light - Dif wv correspond to white light - Prism and aimed white light and paper behind prism - Light broke into components like rainbow - Distributuin of dif ev - Roygbiv – not see violet - Dis into dif wv ass with dif colours - Greates andgle of dispersion is for small wv, red refracts less Contd - Slit, only on pass through considerd monochromatic – one colour - White light into diff colours - On wv one monochromatic light or wv - All mono chromatic to one surface light percievd as white Colour vision - Dif surfaces absorb reflect dif wv - Blue – reflect blue wv then perceive blue - Red all absorbed except long reflected out - Not really red or blue what absorb abd reflecting - White reflect all, pereice red - Black absorb all wv length, no wv being reflected off surface - Objects not coloured need an observer - Alien come to earth to perceive colour need similar circuit - Coloour our way viewin ev Prop - Hue – colour of wv, colour blue yellow etc, and colour ass with wv - Sat – amount of white light added to colour, white tinge duller less sat, high sat rich bright and vibrant, not extreme brightness, high sat blue not bright or light blue, has to be midrange, high sat not extreme of brightness of drk or light, more add white light, more whit, whote grey or rich - Brightness – amount of intensity of light or dark how light or dark separate from other comp, less bright dark Contd - Yellow – refle long wv and few of med and less of swv - Green lots of med refl and less of short or long - Selecitive refeltion - Reflect some wv then - Achromatic – equal of diff wv - Relection similar but amount reflection different - White 80 - Grey 20 -70 - Black 5 -10 - 90 percent of black object is absorbed - Not selective like blue or red, amount reflection difference - Sel tran – transparent obects, frosted glass, or cranberry juice, red cran transmission selective for red so long, orange med - Transmission transparent - And reflective opaque and Colour wheel - Em as a band - Colour as wheel or circle - Same colours beside if em spectrum - Diff now get diff in colour and called extra spectral colours exist outside spectrim - Pruple mix short and long – more hues extraspectral Wheel - Differences in hue and sat - Hue around perimeter – circumfrerence - Sat move in towards the circle – less as move in out is rich more sat – in less sat more white - 3 dimentions of prop – Spindle - Brighteness vertical axis - Highly sat cant be dark or bright extremes - Colour as spindle bc 3 properties Mixing - 2 tyoes - Add – mixing lights – adding wv - Subtr – mixing pigments – paint u subtract wv Add - Combing dif wv to make new colour - 3 prim produce anytyope of monochrome, red green and blue, - Cant use 2 primary to use anothher primary - Phys prop differ but same Cont - Red long, blue and green and add all is white - Say add blue green get scion – s and m - Red with green – l m get yellow, - Red and blue, l and s get purple magenta - Ass add get combo of both - L and m you get sum Cont - Complementary colours – opp hues on colur wheel - Compl – mix colours produce white, bc yellow m l and violet gets s l get all wv of spectrum and get into middle white or grey depending on - Non comp, red yellow get duller less sat for any non comp Sub - Mixing paints - More the darker - More in more wv suntract - Yellow mix purple, purple s and l, yellow m and l, yello absorb s from pruple and m absorbed by purple, and then long is left Contd - Blue, refl s and m but more s - Yellow , m and l, - Blue and yellow, blue absorb red, and yellow blue, yellow and blue reflect green so what you see, what both reflecting is what you will perceive Objects - Light reflects - White all - Red longer - Green medi Col and cones - How perceive colour - 3 cones s m l - 3 cones 3 primary colours - Rather cone for every hue, 3 produce all hues - 3 primary colours b g r, and cones responsive to blue s, med green and long and red, similarities Trichromaic - By helmhtoz and young - 3 primary then
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