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Pierre Duhem wrote:

"Jorge,
You should nevertheless apply the rule about the 600 pixels width."

in response to a 1000 pixel wide image
See: HERE

A small monitor that will not let you see images at full size if these images are greater than about 600 px wide.
I use Microsoft Windows Explorer 7 to open Diptera.info.
At the bottom of the screen there is a size icon that allows for a page to be scaled from 50%-400%. Thus Jorge' s 1000 px image can easily be scaled down to 500 px.
One gets a better image by scaling down from large to small rather than scaling up from small to large.