> but it still takes a really long time The signature is computed by iterating over every pixel in the image. ImageMagick Studio distributes the Wizard Toolkit (http://wizards-toolkit.org/script/digest.php) which includes a digest program that efficiently returns a signature as RDF:
<?xml version="1.0"?> <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"; xmlns:digest="http://www.wizards-toolkit.org/digest/1.0/";> <rdf:Description rdf:about="image.png"> <digest:modify-date>2008-04-25T20:19:02-04:00</digest:modify-date> <digest:create-date>2008-04-25T20:19:02-04:00</digest:create-date> <digest:timestamp>2008-04-26T12:25:47-05:00</digest:timestamp> <digest:hash>SHA256</digest:hash> <digest:digest>78709afc0de69f51085675329dc44c8b475258c1e7fd29acea078347e641a020</digest:digest> </rdf:Description> </rdf:RDF> However, as you suggested, it will return a different signature if the EXIF data is changed. _______________________________________________ Magick-users mailing list [email protected] http://studio.imagemagick.org/mailman/listinfo/magick-users
