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Stills from David Storks computational model calculating Diego Velasquez's painting Las Meninas was painted from life and not created through the use of the camera obscura that Velasquez projected onto a canvas and traced.
Inferring illumination direction estimated from disparate sources in paintings: An investigation into Jan Vermeer’s Girl with a pearl earring
"Stork and Johnson tested for the location of the illuminant, and thereby rejected the claim that an artist used projection optics when executing a particular painting....Our work has addressed the estimation of the direction of the illumination perpendicular to the line of sight; that is, this direction could be described by a single angle with respect to the horizontal."
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"Fidelity analysis of mechanically aided copying/enlarging of Jan van Eyck’s Portrait of Niccolò" Albergati" By David Stork & Marco Duarte
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