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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How to watch Samsung Unpacked 2026 - and what to expect
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The exposed information wasn't just 3D floor plans of homes, which would be bad enough. But the device's live camera feeds and microphone audio were also accessible.