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Lloyd Godman
Subtractive Colour Formation
We can also alter the colour of the light by using coloured filters to absorb certain wave lengths while transmitting others.
| If we wanted to subtract only blue light we would place a yellow filter in the light beam, because this allows both green and red light to pass and as there is no yellow component in the colour blue the filter acts like a piece of opaque card. |
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To Subtract all light we would use all three filters.
To subtract red light you use a green - blue (cyan) filter.
To subtract green light we would use a bluish - red (magenta) filter.
So yellow, magenta, and cyan are anti or complementary colours to blue , green and red respectively. This inter - relationship is VITAL for the understanding of colour processing and printing.
These principals are used in both the composition of colour film and making enlargements in colour.
