I am trying to isolate/copy the pixels from a blob and thought the pixels-field would be the way to do it: http://ubaa.net/shared/processing/opencv/blob.html
But so far, i get exactly 0 from this. Has anybody used this field succesfully? Or does anybody know another way to copy the pixels from a blob?     

I would like to use it as a sort of glorified magic wand tool.