If it is a color management issue all the colors printed will look funny. The op said his CLI-221-BK is nearly full while all other color inks are much consumed. The op did not say anything wrong with colors. I have been burnt before from yellow being lighter than normal. It was a clog in the yellow nozzles. Why not print a grey scale image with density ranging from 0 to at least 2.0. That will tell if the photo black nozzles are clogged. The medium needs to be set to any of the photo papers.