>>it adds extra load on the webserver and database and fills the
database.

Another point is that, with a standard image stored on the server and 
requested by the browser,
the server can reply "No the image has not changed" and the browser can 
get it from its cache.
If the image is produced from the database by a CF template, CF will 
probably read it each time,
send it over the Net, and the client cache will not be used.
Unless it is possible to optimize this process, but I do not how, and I 
won't spend on minute
trying to figure how.

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