hi i am trying to make a short animation where points will appear randomly within the outlines of the text, to eventually make up the letterforms, originally i wanted to just make the points appear randomly across the whole sketch and then import the image below to mask off the other areas, but so far i have only been able to import the image and then draw points above the image ? 

is there a better way of doing this ? 

any help would be great as i am new to processing