The animation above left shows subtractive mixing. The background is white, meaning that the red, green and blue pixels all emit maximum light, and our animation subtracts from this white background. In the top circle, the red and green pixels are kept at maximum, while the blue pixels vary from zero to maximum and back again, so that the colour at the top varies from yellow (=red+green) to white (=red+green+blue) and back again.

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In the circle at right, the green and blue pixels are kept at maximum while the red pixels vary, so the colour at right goes from cyan (=green+blue) to white and back again. Where the yellow and cyan overlap, we see the subtractive mixture of yellow and cyan. In other words, we see white from which yellow has subtracted blue and cyan has subtracted red. This leaves green, i.e. the subtractive mix of yellow and cyan = white–blue–red = green.

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In the left circle, the red and blue pixels are kept at maximum, while the green pixels vary, so that the colour at left varies from magenta (red+blue) to white and back again. Where the yellow and magenta overlap, we see the subtractive mixture of yellow and magenta. In other words, we see white from which the yellow filter has subtracted blue and the magenta filter has subtracted green. This leaves red, i.e. the subtractive mix of yellow and magenta = white–blue–green = red.

Where the magenta and cyan overlap, we see the subtractive mixture of magenta and cyan. In other words, we see white from which the magenta filter has subtracted green and the cyan filter has subtracted red. This leaves green, i.e. the subtractive mix of magenta and cyan = white–green–red = blue.

Finally, where yellow, magenta and cyan overlap in the centre, we see the subtractive mixture of yellow, magenta and cyan. In other words, we see white from which the yellow filter has subtracted blue, the magenta filter has subtracted green and the cyan filter has subtracted red. This leaves nothing: the subtractive mix of yellow, magenta and cyan = white–blue–green–red = black.

We return to Subtractive primaries and Subtractive colour mixing below.

Additive colour mixing on RGB monitors

The illustration at left shows several different colours. The numbers are six-digit hexadecimal representations of RGB colours. (Decimal goes from 0 to 9, hexadecimal extends this 9, a, b, c, d, e, f, to give 2⁴ values per digit. The colour saturated red is usually written ff0000, but could also be written in decimal: 256;000;000.) The first two digits are the brightness of a red pixel, the next two that of the green, then that of blue. Consequently, 000000 is black, ff0000 is red, ffff00 is red+green, ffffff is white and so forth.

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The right hand part of the picture is a close-up of a computer screen, which magnifies the red, yellow, white, magenta intersection. Looking at the right picture, at top left we see that only red components of each pixel are lit. At top right, both red and green are lit and, from a distance, these appear yellow (as in the picture at left). At bottom right, red, green and blue are all lit and the combination (centre of left picture) is a convincing white. If you have the room to move ten metres or so back from your screen, you'll see that the sections of the picture on the right really do become red, yellow, white and magenta (though the white is less bright than the surrounding white).

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If you'd like to examine this more closely, here are original close-up photographs (courtesy Noel Hanna) for the same illustration shown on a computer monitor and a smart-phone. If you download these files, you can zoom out or in (or walk backwards and forwards) to see the effect.