I tried it, it doesn't seem to work
it gives me only FFs.
I think I'll make it with [Pic0].
sorry for the necropost ^^
the tool I found don't really work indeed, as Haleyia said, so I tried the sourcecoder one that Josjuice gave, and it works !
You just have to browse to your bmp, and that's it, it seems to be able to give you some grayscales hexcode, but i just tried with a B/W pic, so I don't know.
So, p2, you can use this one http://www.cemetech.net/projects/basicelite/sourcecoder2.php
(no need of german, cuz' you'll have anything to do but upload your bmp)