embedding Exif metadata into an image
Use exiftool -url='foo.bar' '/foo/bar/foobar.png' && exiftool '/foo/bar/foobar.png'
to add a web page's URL to a PNG file's TextualData tag and verify its inclusion1, where foo.bar is the web page's URL and /foo/bar/foobar.png is the complete path to the PNG image.
licensing
No rights reserved: CC0 1.0.
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http://owl.phy.queensu.ca/~phil/exiftool/TagNames/PNG.html ↩