when trying to blend 2 images after they are open i try to drag one image to the other but they both show in the same background layer...i am having this message:
"COULD NOT COMPLETE YOUR REQUEST BECAUSE THE ORIGINAL SOURCE DOCUMENT IS IN INDEXED MODE"

i also got this "COULD NOT COMPLETE YOUR REQUEST BECAUSE SOURCE AND DESTINATION DOCUMENT ARE THE SAME"

WHAT IAM DOING WRONG?
please help.

all iam trying to do is blend 2 images.