You can start with a graph which appear by default at GraphThing , like cycle , lattice , Petersen etc … or considering a single node , and start making your own graph adding nodes and edges . It ‘s quite easy to handle and has much fun .
You can download it at Ubuntu-software center for free .
The output can be GraphML format . GraphML is an xml-based file format for graphs. So in this case we will receive a file with xml code .I suggest to save the output as a postscript (file.ps) and then convert it at JPG , with the following command at the terminal :
gs -sDEVICE=jpeg -dJPEGQ=100 -dNOPAUSE -dBATCH -dSAFER -r300 -sOutputFile=file.jpg file.ps
this will probably give a jpg with width and height about 2000-3000 px , so just save it again , with a smaller amount of pixels .
zeracuse 