Wow, crazy coincidence! I suppose there's likely not thaaaaaaat many of us out there who worked in Noritsu photo labs though :)

For a photographer shooting digital, if they installed our color profiles on a computer with a calibrated monitor, the print output would more closely match what they see on their screen. It's just a way to try to eliminate some variance between display and output since every screen and every printer is different.

My first "real job" was working in a photo lab with Noritsu printers. We manually adjusted all photos. Some wedding jobs we would have over 1,000 prints. Thankfully most of those photographers had our colour profiles installed, so for the most part it was just adjusting density.