Hi there, my name is ***** ***** I'll be helping you with your problem today
I too have the Canon Pixma Pro 100 and for printing color correct photos it is important to use the Canon printer configuration for 1. the right paper type, and 2. the right color profile
Depending on what software you are using to print pictures the printer can either determine the coloring or the program can. I like to use Lightroom to print my pictures, but then I allow the printer to calibrate the colors:
You can see here: http://canonusa.i.lithium.com/t5/image/serverpage/image-id/8780iA53987DE293590D7/image-size/original?v=v2&px=-1
The option to have the printer manually manage the color profile
Here you can set the profile to match different profiles (your monitor may have similar profiles that this can be set to the same)
Also check to make sure that you are not running out of a certain color of ink which can make your exposures way off, whereas black text looks normal because it is just using black / grey ink.
Let me know if these suggestions help out