On my smartphone, the largest image is around 8mb and the smallest in the same camera settings is around 2mb (images of different objects though). Why is there such a huge difference in image size?
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It has to do with the way image compression works. If you have an image with large uniform areas, like a blue cloudless sky, compression is going to be a lot more efficient than with an image with a lot of detail. Let’s just assume you have 200 blue pixels in a row as opposed to a mix of blue and white in a cloudy sky, the image compression format can basically say “200 times blue” instead of saying “blue, then white, then blue, then white again…” Generally speaking, less change in color across a row of pixels means better compression. That’s why some images can be reduced to a very small size and some need more space, because they need to store more specific information about the different parts of the image.
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