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Understanding Colour Mixing: Additive vs. Subtractive Methods

Dive into the world of additive and subtractive colour mixing, from RGB lights to CMYK inks. Explore how primary colours combine to create white or black. Learn about the colour wheel and complementary colours through fun activities.

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Understanding Colour Mixing: Additive vs. Subtractive Methods

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  1. SUBTRACTIVE COLOUR MIXING ADDITIVE COLOUR MIXING

  2. ADDITIVE COLOUR MIXING

  3. Additive colours are associated lights emitted directly from a source before an object reflects the light. These colours are red, green and blue. We see them in television and computer displays: RGB for short (red, green, blue). ADDITIVE COLOUR MIXING

  4. SUBTRACTIVE COLOUR MIXING

  5. Subtractive colours are associated with pigment or ink. These colours are Cyan, Magenta and Yellow. SUBTRACTIVE COLOUR MIXING We see them in printing process: CMYK for short (cyan, magenta, yellow, black) the K stands for black.

  6. Mixing coloured light:

  7. Bymixingcolour pigments,What do you get ? Tryit !!!

  8. Mixing coloured ink:

  9. So,is theopposite ofSUBTRACTIVE COLOUR MIXING ADDITIVE COLOUR MIXING

  10. ACTIVITY 7 : ResultsThe three primary colours of the additive synthesis are green, red and blue which are light and if you mix, you will get White.The three primary colours of the subtractive mixture are magenta, yellow and cyan which are pigments and if you mix, you will get Black.

  11. ACTIVITY 8 : Results Isaac Newton proved the relationship between light and colour by passing a beam of white light through a triangular prism. The light was decomposed into a variety of colours from red to violet. They are the colours of the rainbow. When you see an object, the feeling of white appears if it reflects all the incident light. The sensation of black appears when all the incident light is absorbed. Charles Augustus Young showed with an experiment called additive synthesis of colour that we could obtain white light by mixing the three light colours fully saturated that are green, red and blue. When we work with pigments or inks, the more colours we mix, the more the light is absorbed until we reached black. This is called subtractive mixture, which is the opposite of additive synthesis of colour. The primary colours of subtractive mixture are yellow , magenta and cyan. All three together mixed give black.

  12. COLOUR WHEEL

  13. The colour wheel or chromatic circle represents the colours ordered and related systematically. Yellow, magenta and cyan, the primary colours are equidistant. The secondary colours, red, green and blue are obtained by mixing the primary colours in equal parts. These are the six basic colors.

  14. Draw a colourwheel:Youneed to draw a circlefromthecenter of the paper, and mark itwiththemeasure of theradius to makesixequal parts. Divideeach part intotwo.

  15. Complementary Colours are diametrically opposite each other

  16. Green Cyan Yellow BlueRed Magenta ....... is complementary to .......

  17. Woman in Front of the Sun, painted by MIRÓ

  18. Relax !!!

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