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Pigments can subtract colours from light

Pigments can subtract colours from light. Section 4.3 Lesson 6. Light and Solid Objects. Most of the objects we deal with every day are solid and opaque How do opaque objects deal with colours of light? They absorb all colours except for the colour they reflect. White light hits the apple.

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Pigments can subtract colours from light

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  1. Pigments can subtract colours from light Section 4.3 Lesson 6

  2. Light and Solid Objects • Most of the objects we deal with every day are solid and opaque • How do opaque objects deal with colours of light? • They absorb all colours except for the colour they reflect White light hits the apple But only red is reflected

  3. Light and Solid Objects • The reason why solid objects act this way is because they contain pigments • Pigments are chemicals that absorb all wavelengths of light except for the wavelengths that they reflect • That is why a red apple looks red – that is the only wavelength of light reflected! • Think of pigments as subtracting (or absorbing) wavelengths of light

  4. Subtractive Primary Colours • These three primary subtractive colours subtract (or absorb) wavelengths from white light so that you see: • Magenta • Cyan • Yellow Where else have you seen this colour combination?

  5. Subtractive Primary Colours When Cyan and Magenta and Yellow are subtracted from white light: Cyan and Magenta produce Red Cyan and Yellow produce Green When magenta and yellow are subtracted from white you get blue And because they take colour away (absorb energy), all three colours combined produce black

  6. Combining Subtractive Colours - The Colour Wheel • The colour wheel includes the primary subtractive colours, the secondary subtractive colours, and a new category – the tertiary colours • Secondary colours are formed by mixing the primary colours • Tertiary colours are formed by mixing the secondary colours

  7. The Colour Wheel

  8. Primary additive colours, Secondary subtractive colours-

  9. Primary subtractive colours, Secondary additive colours

  10. Tertiary Colours

  11. Complementary colours

  12. White – (Cyan + Magenta + Yellow) = Black W – (C + M + Y) = K Primary colours Combining colours of light – subtractive colour equations White – (Cyan + Magenta) = Blue W – (C + M) = B Secondary colours White – (Cyan + Yellow) = Green W – (C + Y) = G White – (Yellow + Magenta) = Red W – (Y + M) = R

  13. Notes • Complete the Gizmo on Subtractive Colours • Complete the rest of handout • 4.3 How can you mix colours… • Complete the colour equations handout • (4.3 Colours of Equations Worksheet.PDF) and check your answers with the presentation (Lesson 6a)

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