In article 3Sjrd.190815$hj.39872@fed1read07,
says...
One of the oddities of the art world is that some shows require slides for
entries, but won't take digital files. So, you have to take your digital
file and convert it to a slide, so that you can send it in for them to
(supposedly) pop into a projector and view at many times the size of the
original, then send you an email of rejection...

Ah... Luddites!
--
http://www.pbase.com/bcbaird/