Originally Posted by SuLinUX
I always use PNG for screen shot's, Linux uses png by default anyway even the icons. Great format as it provies much better and quality than jpg or gif, transparency as well.
I've optimized your png a bit, quality is still almost the same, just to show that PNG compression can be even more efficient.
One of the main advantage of the PNG format over JPG, in my opinion, is you can encode files in 8bit when 32bit is not needed (like here).