You look at a region of the image. If all the pixels are roughly the same color (below some threshold), you store the average color for the whole region as a single value. If the pixels vary too much, you split the region into four quadrants and try again.
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'It's harder to be a parent than a space shuttle commander', trailblazing Nasa pilot tells BBC
in order to handle its multiple devices, like the printer and card punch, it