Ubuntu – Any way to automatically compress a .gif file

I assume you're using http://www.imagemagick.org/. The -dispose command describes what is to be done with the frame after its delay (when the next frame is loaded). Info here: http://www.imagemagick.org/Usage/anim_basics/#dispose

-dispose previous

try:

convert -delay 5 -dispose previous -loop 0 Frame_7_00000*.png" animated.gif

You can use ImageMagick to convert images in varying ways, and it should be able to this quite easily. First you can split up into to parts (original.png being the source image, and in this case 32x32pixels in size):

convert original.png -crop 32x32 parts-%02d.png

You can then convert it into a animation (use -loop 1 if you don't want it to loop):

convert -loop 0 -page +0+0 ./parts*.png output.gif

Resulting in:

The output PNGs of the first command have a offset included in them, so without the -page +0+0 option the animation ends up like:

There are varying other options you can include (mainly in the second command), such as -delay etc - you can also optimize the animation so it is smaller (and faster to load/render) - e.g. borrowed from here:

convert output.gif -fuzz 10% -layers Optimize optimised.gif

or using gifsicle

gifsicle -O output.gif -o optimised.gif

EDIT: If the frames are transparent, you can set the frames to replace by adding the
-dispose Background option, so when a frame is disposed of when the next one is loaded:

^{Example above done without the page option so it shows clearly}

The problem with this is you probably can't optimize the resulting image much then - so another way may be to make the frames opaque so the next frame covers the previous.