Thanks Les, that's means the 1080i/50 input source can up-converted & select as the 4K input.
But can this up-converted input source be used as key source in the key 2, and shown in the whole 4K picture?
Because the up-converted signal are now enlarged as 4 times its original size, the size of the key signal is also enlarged.
It may be shown in the picture in more than one quadrant.....
Hope can have your explanation if the up-converted key signal will also enlarge & shown in 4k PGM output.
thanks from Jackie
#Carbonite