Good thing nobody is reading these forums, else I'd hate to tell you that for e.g.,
http://chart.googleapis.com/chart?chs=320x200&cht=ls&chd=t:1,99 I came up with
$ ls
-rw-r--r-- 1 625 03-12 15:20 Jidanni.png
-rw-r--r-- 1 4626 03-12 15:20 Google.png
That's right, as there really are only two colors than why use more depth?