Add-on to the posts above,
Your digital photos will be RGB, while your deskjets/ dyesub are in CMYK, so if you really want accurate colours, you will have to convert your colour mode in Photoshop to CMYK first or else the printer will be doing the conversion for you. However this has limitations since your computer monitor outputs in RGB pixels too.
To make a simple comparision using the method described by ST1100 above, just use a small photo (a portrait if you shoot people more often), make duplicates of the photo, then apply different incremental amounts of blue ( 5%, 10%, 15% etc etc). And then print all of them on the same piece of paper to reduce the amount of paper needed. A more accurate way will be adjusting the amount of the individual ink colours ( if you have already converted to CYMK). This is a bit harder, since most people are not familar with how CYMK inks interacts.