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Originally Posted by Don Hoey
I would assume that in digital photography, bigger file size = more available actual image information in that file.
Don
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Strickly speaking this assumption is true. It depends what you think "actual image information" as. A endoder cannot tell the difference between noise and wanted image data. Mind you some encoders did attempt to spot low level rapid changes and smooth them to improve the compression of data.
With experience you should be able to look at an image and gauge how well it will compress. Is it worth starting a dummies guide to data compression seeing so many places impose a file size limit ?