After much experimentation, I believe I have found the problem that produces washed out prints on myCanon Mp495, & a workaround. After clicking >Filet>Print Image, & making sure that the Color Profile is set to "Canon IJ Color Printer Profile", then clicking >Print>Color Matching (expand the menu labeled "Layout"), I noticed that the box marked "Color Sync" is checked rather than "Canon Color Matching", & that the menu is grayed out so it cannot be changed. (Going thru the same process w iPhoto allows this change to be made, & also gives access to "Color Options" farther dpwn in the menu.
The workaround: either print from iPhoto, making sure that "Canon Color Matching" is checked
click>PDF>Open PDF in Preview, then print from Preview, making sure that 'Canon IJ Color Printer Profile" & "Canon Color Matching" are checked in their respective menues.
I hope Apple will fix this bug, along with the one that prevents saving pictures from mail directly into Aperture or iPhoto/