PSYC10003 Lecture Notes - Lecture 13: Electromagnetic Spectrum, Subtractive Color, Trichromacy
13 Jun 2018
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28th March ‘18
MBB1 Week 5; Lecture 13 Notes
Colour 1
-to see
-starts from retina capturing light from outside world
-if this fails - we lose our vision
-develop sense of colours to describe what we see
-colour is very important - understanding of the world
-aspect of vision
-we cannot describe colours to each other (without mentioning colour words or similes/
metaphors)
-we all have a different take on colours, feelings, perspective of life
-The Dress (blue/black or white/gold?)
-people see different colours in the same photo
-due to lighting in the pic, background lighting influencing the colours
-also depends on the point (anchor) where we determine the colour of something
-we could have limited pairings of colour in our minds
-how we create a system that’s sensitive to change
-power of observation
-first 2 stages of vision deduced on basis of almost pure phenomenology
-Newton: physical nature of light
-showed that white light was made up of the sum of all different visible colours
-turned the way of thinking around - allowed problem to be defined
-visible spectrum - represented in electromagnetic spectrum
-Young & von Helmholtz: colour is infinite
-we have “3 different colour detectors” in our retinas = perception of colour
-subtractive colour mixing for pigments, mixing three colours (red, blue & green), if you
mix all 3 you get black
-additive colour mixing for light = if you mix all the colours it becomes white
-principal of uni-variance = output elicited by absorption of proton will be the same
regardless of the placement on the wavelength
-trichromacy = two overlapping photopigments
-discriminate between 2 overlapping wavelengths = compare output of cone cells
-calculation of rations = fundamental to process
find more resources at oneclass.com
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Document Summary
Starts from retina capturing light from outside world. If this fails - we lose our vision. Develop sense of colours to describe what we see. Colour is very important - understanding of the world. We cannot describe colours to each other (without mentioning colour words or similes/ metaphors) We all have a different take on colours, feelings, perspective of life. People see different colours in the same photo. Due to lighting in the pic, background lighting influencing the colours. Also depends on the point (anchor) where we determine the colour of something. We could have limited pairings of colour in our minds. How we create a system that"s sensitive to change. First 2 stages of vision deduced on basis of almost pure phenomenology. Showed that white light was made up of the sum of all different visible colours. Turned the way of thinking around - allowed problem to be defined. Visible spectrum - represented in electromagnetic spectrum.
