System CMYK:

The paper is initially white. It means that it possesses ability to mirror all spectrums of colors of light which on it gets. Than more qualitatively is a paper, the better it mirrors all colors, and it seems to us is whiter. If the paper is worse, then the worse it mirrors colors, and we consider as its sulphur.

Opposite example is asphalt. Just put good asphalt (without pebble impurity) – ideally black. That is actually its color to us is not known, but it is that that swallows all colors of light which on it falls and consequently it seems to us black. In due course, when on asphalt pedestrians start to go or to go computers, it becomes “dirty” – that is on its surface substances which start to mirror visible light (sand, a dust, a pebble) get. Asphalt ceases to be black and becomes “grey”. If we managed to “wash” asphalt from dirt – it again would become black.

Dyes represent substances which swallow certain color. If dye swallows all colors except red at sunlight, we will see “red” dye and we will consider it as “red color”. If we look at it dye by the light of a dark blue lamp, it becomes black and we will erratically accept it for “black color”.

By plotting on a white paper of various dyes, we reduce quantity of colors which it mirrors. Having painted a paper with certain color we can make so that all colors of an incident light will be swallowed by dye except one – dark blue. And then the paper to us will seem painted in dark blue color. And so on.

Accordingly, there are combinations of colors, mixing which we can swallow completely all colors mirrored by a paper, and make its black. The combination “fuchsine-cyanogens-yellow” (CMY) – cyan/magenta/yellow has been by practical consideration output.

In an ideal, mixing these colors, we should receive black color. However in practice so it is impossible because of technical qualities of dye. At the best that we can receive, is a dark-brown color which only bears a faint resemblance to the black. Moreover it would be rather unreasonable to use all three expensive colors only to receive elementary black color. Therefore in those places where it is necessary black, instead of a combination of three colors usual cheaper black dye is put. And consequently to combination CMY K (black character – designating black color is usually added.

White color in the circuit is absent, as it we and so we have are a color of a paper. In those places where white color is necessary, color simply is not put. Absence of color in circuit CMYK means corresponds to white color.

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