>>The people browsing the catalog online will need to know if the image

>>they are downloading is of web or print quality.

Then the only thing that matters is the width in pixels:
about 800 px or less it is Web quality, one need at least 1024 or more for 
print quality.
This has nothing to do with DPIs: a 200 px image at "4000 DPI" is just not 
printable,
and a 4000 px image at "64 DPI" is perfect for printing.

The numeric camera market has invented this stupid "image resolution" idea
to kind of emulate standard camera definition. A photographic paper camera does 
have a definition, since it actually prints on a film whitch does have inches 
and dots (the smallest sensitive particle). But numeric cameras only store 
virtual images in memory.
The only thing that matters is the number of pixels.

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