heptat

Didn't notice any bugs, but haven't tested for bugs. Used it and it works great - favicon.ico is much small than that other thing I used in http://nashape.com/blog/2012/09/12/big-favicons/. Great work! (especially because you did it in PHP which, after 10 years, I don't think I can face again...)

Good pick up, fixed that error now. Thanks for the link too!

Microsoft suggests 24x24: http://msdn.microsoft.com/en-us/library/cc849094(VS.85).aspx...

Out of interest, what language will you write it in?

Sorry about that – the point of the article definitely wasn't to exclude non-Retina users, it was just to document what I was encountering when I came to creating a favicon for the site.