jpeg compression ratio

Question

Is there a table that gives the compression ratio of a jpeg image at a given quality?

Something like the table given on the wiki page, except for more values.

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Answer 1

The compression you get will depend on what the image is of as well as the size. Obviously a larger image will produce a larger file even if it's of the same scene.

As an example, a random set of photos from my digital camera (a Canon EOS 450) range from 1.8MB to 3.6MB. Another set has even more variation - 1.5MB to 4.6MB.