DIFFERENTIAL IMAGES
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Projection, 2009
A differential image is a visualization of differences produced by the digital comparison of two
images. In collaboration with the Fraunhofer Institute for Secure Information Technology (SIT)
in Darmstadt, high-quality reproductions of original artworks loaned in conjunction with the
exhibition were prepared with the actually invisible digital watermarking system “ImageMark”.
The “original” reproductions were then compared to the marked ones in a differential procedure
and the differences between the pictures were visualized.
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