Imagemagick can easily make an animated gif from existing images with a simple command. I’ll show you how!
First, install imagemagick:
$ sudo apt-get install imagemagick
Next, gather all of your .jpg images together in a single folder or directory.
If needed, date/name files in a numbered or sequential order. The manor in which they appear listed in your directory is the order they will appear in the animated GIF!
Next, resize your .jpg images to a smaller size, such as 640×480 by using the following command:
$ mogrify -resize 640x480 *.jpg
And finally, issue the command below to create an animated gif of your jpg images.
Increase the delay time for a longer transition between images. Tack loop 0 will loop your GIF indefinitely. Tack loop 3 would loop three times, for example.
$ convert -delay 20 -loop 0 *.jpg myimage.gif