Hi ! Could you please point me to some resources explaining chromakey, and how to use bt848/878 to help in it (if its possible). My goal is a simple program to change a scene background, and I found some books that point chromakey tech as useful to do it. Bests regards. -- Gleicon S. Moraes - gleicon@xxxxxxxxxxxx | gleicon@xxxxxxxxxx http://planeta.terra.com.br/informatica/gleicon http://videodog.cjb.net