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Colour Theory and Application

Colour Theory and Application. B.Sc. (Hons) Multimedia Computing. Media Technologies. Describing Colour. Words we might use when naming and describing colours:

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Colour Theory and Application

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  1. Colour Theory and Application B.Sc. (Hons) Multimedia Computing Media Technologies

  2. Describing Colour • Words we might use when naming and describing colours: • ‘shade, hue, warm, tone, bright, dim, pale, intense, vivid, rich, saturated, cold, strong, wishy-washy, glowing, colour, flat, weak, muddy, soft, vibrant, luminance, bold, tint’ • Very subjective - influenced by perception and characteristics of illuminating light source. B.Sc. (Hons) Multimedia Computing Media Technologies

  3. Colour Temperature

  4. The Colour Wheel

  5. Hue, Saturation, Value (HSV) The HSV model is based on the following concepts • Hue - this is what most people would refer to as the colour or shade. Red, yellow, green and blue are hues. • Saturation - this is a value that represents where the colour is on a scale from achromatic white to the pure hue. • Value - is the attribute, sometimes referred to as brightness, which determines how intense the colour is on a a scale from black to the pure hue.

  6. Colour Models • Additive Synthesis - Start with no light. Add red green and blue light to make white and complementary colours • Subtractive Synthesis start with white light. Subtract red green and blue light to achieve complementary colours and black B.Sc. (Hons) Multimedia Computing Media Technologies

  7. Additive Synthesis B.Sc. (Hons) Multimedia Computing Media Technologies

  8. Colour Models:RGB • Display devices generally use a color model called RGB. • Stands for Red-Green-Blue • Based on the additive synthesis model • RBG colour value specified in three bytes B.Sc. (Hons) Multimedia Computing Media Technologies

  9. Subtractive Synthesis B.Sc. (Hons) Multimedia Computing Media Technologies

  10. Subtractive Synthesis B.Sc. (Hons) Multimedia Computing Media Technologies

  11. Colour Models:CMYK • Cyan-Magenta-Yellow-Black, and pronounced as separate letters. CMYK • Based on the subtractive synthesis model • CMYK is a colour model in which all colors are described as a mixture of these four process colours. • CMYK is the standard colour model used in offset printing for full-colour documents. Because such printing uses inks of these four basic colours, it is often called four-colour printing. B.Sc. (Hons) Multimedia Computing Media Technologies

  12. CMYK Subtractive Subtractive color: Illuminate objects that contain dyes or pigments that remove portions of the visible spectrum. The objects may either transmit light (transparencies) or reflect light (paper, for example). The subtractive primaries are C, M and Y. Cyan absorbs red; hence C is sometimes called "minus red" (-R). Similarly, M is -G and Y is -B. B.Sc. (Hons) Multimedia Computing Media Technologies

  13. Colour Models: RGB & CMYK B.Sc. (Hons) Multimedia Computing Media Technologies

  14. B.Sc. (Hons) Multimedia Computing Media Technologies

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