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Data and binary

Pixels and colours

A photo on a screen is a grid of pixels. Every pixel mixes red, green and blue light, each with a number from 0 to 255.

Lower secondary (grade 1)11 to 14 yearsDraft: Not yet checked by a computing teacher.

Why

If you look very closely at a screen, or through a magnifying glass, what do you see?

You see tiny squares, each with one colour. From a distance they look like one smooth picture together. Those squares are called pixels.

A computer does not store a colour the way we see it, but as numbers. How do you make a colour out of three numbers? You find out here.

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