1) Enter GIF URL
test urls:
http://www.spiceware.org/atari/12_30_07_frames/level_32.gif
http://www.spiceware.org/atari/12_30_07_frames/stayfrosty_title.gif
http://www.spiceware.org/atari/12_30_07_frames/stayfrosty_title_2.gif

2) Process file