Revenge of the Animated GIF

animated_gif_1Yes, now animated GIFs can be created using only Fortran code.  I present FGIF, now on GitHub.  It is a modified and updated version of the public domain code found on the Fortran Wiki.  It was used to create the image shown here (which is an example of a circle illusion).

For more information on the GIF format, see:

It was interesting to discover that animated GIFs are actually a Netscape extension to the GIF file format.  If you open any animated GIF in a hex editor, you will find the string “NETSCAPE2.0”.

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