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An example of how a colour image is constructed from four broad-band filters.

(seen from the side in 1.): blue, green yellow and red.When the images are overlaid (2. and 3.)the resulting image (4.) is a colour composite.

To make a natural colour image the order of the colours assigned to the different exposures should be in “chromatic order”, i.e. the lowest wavelength should be given a blue hue, the middle wavelength a green hue and the highest wavelength should be red.

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