hello im a beginner in pure data and i want to make a project like this :
we have 3 colors red blue and green and a webcam, whene we make our hand over a color we listen a sound its like a piano with webcam ! can anyone help me to do this !! thanks

http://www.pdpatchrepo.info/hurleur/2.jpg

Hi momo,
if you want some help you should post in the right section of the forum (in this case it can be technical issues or pixel#). Then I suggest you to give a more specific object (webcam piano maybe?) to your post, just to make things easier.
Cheers