Hello jim, thanks a lot, but i used jpeg compression in Ps, at the worst quality (0), without preview, after reducing the image at 40 x 40 pixels without sharpening..., and i'm still exceeding the 6 KB limit.
This is because my vervatar try has to much sharp transitions on it as you can notice:
http://gbotet.perso.sfr.fr/vrv/moiCMK.jpgjpeg is comfortable with "realistic scenes with smooth variations of tone and color" (quoting wikipedia), so my image is clearly difficult for the algorithm.
It is not a problem at all, i will try to digitally paint my smurf later on, with "smooth variations of tone and color" this time.
