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Drop trailing whitespace.  Ok'ed by wiz.

Gifsicle is a UNIX command-line tool for creating, editing,
and getting information about GIF images and animations.
You can also extract frames from animations, or replace, delete,
or insert frames into existing animations.
Some more gifsicle features:
  * Batch mode for changing GIFs in place.
  * Prints detailed information about GIFs, including comments.
  * Control over interlacing, comments, looping, transparency...
  * Creates well-behaved GIFs: removes redundant colors, only uses
    local color tables if it absolutely has to (local color tables
    waste space and can cause viewing artifacts), etc.
  * It can shrink colormaps and change images to use the Web-safe
    palette (or any colormap you choose).
  * It can optimize your animations! This stores only the changed
    portion of each frame, and can radically shrink your GIFs. You can
    also use transparency to make them even smaller. Gifsicle's
    optimizer is pretty powerful, and usually reduces animations to
    within a couple bytes of the best commercial optimizers.
  * Unoptimizing animations, which makes them easier to edit.

Two other programs are included with gifsicle: gifview is a
lightweight animated-GIF viewer which can show animations
as slideshows or in real time, and gifdiff compares two GIFs
for identical visual appearance.