Read .bmp -> .jpg or anything else

Hi,

I'm trying to resample a bmp image, i don't control this format, it seems
the gd lib doesn't support this one, wbmp is supported (wireless format),
but not traditional .bmp files.

I found after many searchs a useful post from google groups, here it is :
http://minilien.com/?3QyP6JT67s
I'll test tomorrow if it works but i would like to know if anyone know
another solution, perhaps a built-in function i missed ?

Thanks,
Arnaud