Lets take something I'm familiar with - a 13mm 3cs. If I downsize the image to 1024x1024, then each dot represents the average light from 0.013mm of the coin. Features smaller than that are lost. If I size down to 480x480, each pixel is 0.027mm.
But it's ALWAYS a tradeoff - the more pixels the more detail, the more space.
Most of us find that space is cheap and you can never get those pixels BACK, so we store the best images we can and then downsize them for posting (after all, my screen is only 1650x1080 so anything more than that is a waste to post.
-----Burton
50+ year / Life / Emeritus ANA member (joined 12/1/1973)
Life member: Numismatics International, CONECA
Member: TNA, FtWCC, NETCC, EveryCountry (online) coin club
Owned by three cats and a wife of 40+ years (joined 1983)
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