Textbook Notes (372,187)
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PSY280H1 (40)
Chapter

Ch9 Textbook Notes

6 Pages
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Department
Psychology
Course Code
PSY280H1
Professor
Christine Burton

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Description
CHAPTER 9 PERCEIVING COLOURINTRODUCTION TO COLOURWhat Are Some Functions of Colour Vision Signals function helps us identify and classify things o Observers recognize appropriately coloured objects quicker and more accuratelyFacilitates perceptual organization by improving the ability to tell one object from another and picking out objects within a scenesProposed that colour vision may have evolved for the purpose of detecting fruitWhat Colours Do We PerceiveBasic colours red yellow green blueColour spectrum shortblue mediumgreen longyellow and red o Extraspectral colours dont appear in the spectrum brown purpleSaturation the amount of white in a colour adding white decreases saturationColour and Wavelength400450nm appear violet 450490nm appear blue 500575nm appear green575590 appear yellow 590620nm appear orange 620700nm appear red Reflectance and TransmissionThe colours of objects are largely determined by the wavelengths of light that are reflected from the objects into our eyes o Eg black and white paper reflect all wavelengths equally across the spectrumSelective reflectance the property of reflecting some wavelengths more than others o Chromatic colours or hues reflect some wavelengths more than others o Achromatic colours reflect all wavelengths equally white black greysSelective transmission creates chromatic colours when some wavelengths pass through transparent objects Mixing LightsAdditive colour mixture is the creation of colours that occurs when lights of different colours are superimposedIf a blue and yellow light are projected onto a white surface the superimposed area is perceived as white o Blueshort yellowmedium and long wavelengths o Added together light contains all wavelengths resulting in the perception of white Mixing PaintsSubtractive colour mixture is the creation of colours that occurs when paints of different colours are mixed togetherWhen mixed the only wavelengths reflected are those that are reflected by both paints o Blue paint absorbs L reflects some S and M o Yellow paint absorbs S reflects some M and L o A mixture of blue and yellow absorbs L and S reflects M appears greenWavelengths Do Not Have Colour
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