Basic tools
...
If you have extracted a plot and want data from it, tools like g3data and WebPlotDigitizer can be very useful (other options discussed here). These allow you to point and click to grab data points and save them as a spreadsheet.
For precision when selecting points, you can use a feature called "mouse emulation" to control the mouse by the keyboard. This will allow you to get exactly the right pixel of the plot with ease.
Creating animated movies and gifs
Webm Movies
sudo apt-get install mjpegtools
sudo apt-get install vpx-tools
png2yuv -I p -f 24 -b 1 -n 1440 -j my_image_%05d.png > my_vid.yuv
Where:
-I p
Non-interlaced.
-f 24
24 frames per second.
-b 1
Start with image number 1.
-n 1440
The number of images to process.
-j my_image_%05d.png
The file name pattern. %05d is the expanded to 00001, 00002, ..., 01440. %03d would expand to 001, 002, etc.
> my_vid.yuv
Send output to a file instead of dumping it to your console screen.
vpxenc --good --cpu-used=0 --auto-alt-ref=1 --lag-in-frames=16 --end-usage=vbr --passes=2 --threads=2 --target-bitrate=3000 -o my_vid.webm my_vid.yuv
Gifs
convert -delay 20 -loop 0 *.png mygif.gif
http://blog.ahfr.org/2008/03/making-animated-gifs-with-free-software.html