colours of light can be added together to form a variety of colours
TRANSCRIPT
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Colours of light can be added together to form a
variety of colours
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How the eye sees colour
• The eye can only detect three colours of the visible light spectrum:– Red– Blue– Green
• These are known as the primary colours of light
• These colours then combine to form all other colours
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Structure of the eye
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Internal structure of the eye – notice that cone cells are located only at the back of the middle (macula) of the eye
Cones cells detect colour (RBG) while rod cells detect variation of shades of colour
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Normal colour vision – cone cells help us see in colour
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This is how a colour blind person sees “colours”
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Dysfunctions of the rods cells of the eye
Partial function of the cones (red)
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Additive Primary Colours
Magenta is a secondary colour – a
mixture of red and blue
Adding green creates two new
secondary colours:
Green + Red = Yellow
Green + Blue = Cyan
Adding all three primary colours
recreates white light
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Combining Primary Additive Colours
The three secondary colours – magenta, yellow and cyan - are also complementary to the primary colour opposite to each.
Red is complementar
y to Cyan
Green is complementary to Magenta
Blue is complementar
y to Yellow
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Combining colours of light – colour equations
Red + Green + Blue = White
R + G + B = WPrimary colours
Secondary colours Red + Blue = Magenta
R + B = M
Red + Green = Yellow
R + G = Y
Green + Blue = Cyan
G + B = C
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Colour blindness tests
Everyone
Normal – 8
R/G = 3
Normal – 29
R/G = 70
Normal – 6
Deficiency - nothing
Normal – 45
Deficiency - nothing
Normal = nothing
CB - 45
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