Hi List I would like to read multiple instances of a color from a videosource. from a bunch of LEDs i get various colours & the idea is to get different position of LEDs from the same colour. so like in pdp_ctrack the colour could be tracked. but as ctrack only follows one colour or rather several objects follow the same colour/LED, my question are there other objects or maybe anyone has experience how to manage this? probably gridflow would do the job but as i cannot get my /usr/bin/ld to find -lruby i got stuck with this. i appreciate any hints thanks in advance & salutis olsen