If you do not have the latest driver from Canon download it here
Find support for your Canon PIXMA PRO-100. Browse the recommended drivers, downloads, and manuals to make sure your product contains the most up-to-date software.
In the software there should be a Maintenance set of test. Run the print head check.
Ink cartridges that have sat for an extended period of time will separate fluid fro dye or pigment therefore they should be shaken vigorously prior to use. Run the deep clean head cleaning cycle until the head check shows full patterns for each color.
If the head is clean and printing good patterns and the colors are still off its a color profile issue.