1. Additive Colour Theory

2. Brain Teaser Red and green light make yellow light.
Blue and green light make cyan light.
Red, green and blue light make white light.
Red and blue light make magenta.

3. Green and red light make cyan light.
Green and blue light make magenta light.
Blue, red and green light make white light.
Blue and green light make yellow.

4. Today’s Objectives: Learn how colours of light work
Understand what “additive colour theory” means
Know what primary, secondary and complimentary colours are

5. Primary Colours of Light
- Mixing red, green and blue lights together creates white light.
These 3 colours are called PRIMARY colours
Cannot create these 3 colours from other colours
Can be used in combination to create the colours of the spectrum

7. Secondary Colours of Light
These colours are created by combining two of the primary colours
Cyan
Magenta
Yellow

8. Additive Colour Theory
The theory that combining the three primary colours of light produces white light
Combining 2 primary colours produces secondary colours of light

9. Red + Green + Blue = White
Red + Green = Yellow
Green + Blue = Cyan
Red + Blue = Magenta

10. Human Vision
The human eye detects shapes, movements and the primary colours of light.
Back of eye = retina - each retina has 2 types of light-sensitive cells (rods & cones) - each retina has millions of rods and cones

11. Rods & Cones Rods detect low levels of light.
Once our eyes adapt to low light we can see shapes
Red light does not interfere

12. Cones are less sensitive to light than rods
Cones allow us to see colour
3 types of cones (one for each primary colour of light)

13. Colour Additive Theory in Technology
Digital Cameras
Computer monitors
TV screens
*pixilation

14. Cameras
Color filters work by absorbing certain colors of light, letting the remaining colors through. They can be used to demonstrate the primary colors that make up an image.

15. Red/Green Colour Blindness
Color blindness or color vision deficiency is the inability or decreased ability to see color, or perceive color differences, under lighting conditions when color vision is not normally impaired
More common in males (carried on X chromosome)

16. WORKSHEET
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