> How can a file occupy fewer megabytes than it has megapixels? Surely each
> pixel of each colour channel contains one byte of info.

There is also the pixel's position to be recorded. Total info for each pixel
is X,Y,R,G,B.
Then any other file info is tagged to the file as well, so file size can
vary for a given pixel dimension

The only thing megabytes and megapixels have in common is mega.

Tim Wheeler

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