Official comment

Gigapixel - 1 billion pixels.
https://en.wikipedia.org/wiki/Gigapixel_image
Gigabyte - 1 billion bytes.
https://en.wikipedia.org/wiki/Gigabyte
pixel count vs data storage in bytes
Your camera is likely 20 megapixels. This means that one image is made up of 20 million pixels (.02 billion pixels). One image is probably roughly 10 megabytes of storage.
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