Cannon MP600 will not print accurate photo colours

I am trying to print photo's from my MAC (iphoto) to my MP600, for some reason the photo's look great in the preview - great colours and clarity but when I try to print them out they appear very pink looking with a lack depth and colour. . Anyone got any ideas of what is happening here? This is a recent problem and I am not sure how to fix it? I can print the photographic images to plain paper without too much trouble,but using photo paper (kodak)is proving a nightmare...Help please - I have over 40 photos to print for a project, aghhhhhhh...