10.1 Wave model of light Colour Theory. Wave Model of light Remember: Light waves transfer energy Light moves outward in all directions from its source.

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Presentation transcript:

10.1 Wave model of light Colour Theory

Wave Model of light Remember: Light waves transfer energy Light moves outward in all directions from its source

Colour White light is a combination of several colours A prism is transparent glass or plastic with flat, polished sides A prism will separate white light into all of the colours of the visible spectrum (ROYGBIV)

Colours Each colour has a different wavelength Red has the longest wavelength, lowest frequency Violet has the shortest wavelength, highest frequency

Additive Colour Theory Colours of light are NOT the same as pigments you work with in art Primary colours for light: RED, BLUE, GREEN Mixing the primary colours of light mix to give white light Mixing only two of the primary colours results in the secondary colours: CYAN, YELLOW, MAGENTA

How do we see colour? When light strikes an object, some wavelengths are reflected (bounce off an object) while others are absorbed The reflected wavelengths are the colours we see

Subtractive Colour Theory Coloured matter selectively absorbs different colours or wavelengths of light. These colours are “subtracted” from the reflected light that we see Black absorbs all colours White reflects all colours Primary colours: CYAN, YELLOW, MAGENTA WHEN THESE ARE MIXED, BLACK IS PRODUCED!

Subtractive Colour Theory This theory applies to pigments and the colours they absorb (LIKE ART CLASS) Primary colours: CYAN, YELLOW, MAGENTA WHEN THESE ARE MIXED, BLACK IS PRODUCED! Secondary colours: red, green, blue

Subtractive Colour Theory

Homework p. 388 #1-5 p. 391 #1-5,8,10,11