You can do a similar thing with valid PNG files by using the gamma attribute: http://thume.ca/projects/2012/11/14/magic-png-files/ http://thume.ca/projects/2012

You can do a similar thing with valid PNG files by using the gamma attribute: http://thume.ca/projects/2012/11/14/magic-png-files/ http://thume.ca/projects/2012/11/14/magic-png-files/ I reverse engineered this technique a few years ago, it doesn't look as good but it never crashes anything and it has some very useful splits. For example the thumbnailing servers on most sites produce one version but then clicking the thumbnail will show a totally different image in the browser.