Caravaggio used 'photography' to create dramatic masterpieces
http://www.telegraph.co.uk/culture/art/4968509/Caravaggio-used-photography-to-create-dramatic-masterpieces.html
Art history scholars have long known that Caravaggio worked in a sort of darkroom, illuminating his subjects through a hole in the ceiling and projecting the image onto a canvas using a lens and a mirror.
But Mrs Lapucci is the first researcher to suggest that he treated the canvas with light-sensitive substances, including a luminescent powder made from crushed fireflies, in order to "fix" the image as 19th century photographers later would.
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From "Chasing Amy"
Holden: Sorry about him, he's, uh, he's dealing with being an inker.
Alyssa: Oh... you trace.
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It's cool. I understand the need to get the work out. Once you prove to yourself that you can draw naturalistically, why keep doing it?
And yet somehow a part of the respect I once held for masters like Caravaggio and Vermeer has quietly died.