Convert any image to favicon icon format with ImageMagick
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To make a web site icon file that shows up in the address bar in a browser, usually 16×16 pixels in size named favicon.ico, all you need is ImageMagick’s convert.
1 convert pic.jpg -resize 16x16! favicon.ico
Some browsers are shifting away from showing icon files next to the URL, instead showing their own icon to represent the type of content rendered.
http://en.wikipedia.org/wiki/Favicon
If you’re browsing this site using Chrome, you probably see a little globe icon in the URL bar instead of the root hash icon shown here.
Most other browsers like Firefox and Opera, however, still display the favicon.ico