Is there anyway to edit a monitor calibration?

You cannot really trust your perception of what you remember something looks like. I'm using a crt (emac) and I have calibrated it using the onscreen instructions. I just took a pdf that I retouched to be printed on a laser printer and I am astounded at the level of monitor to laser print accuracy, it is as perfect as a monitor can be to cmyk inks. It also was accurate when viewed on the printer's windows monitor. I used a standard US swop profile.

AFAIK, you cannot edit a file you need to start from scratch.

 

I know what you mean, but I don't think it's possible to edit a profile. You can however have some fun looking at the Lab Plot in the ColorSync Utility.app

I'd suggest SuperCal. I tried it on my ACD and it produced FANTASTIC results compared to Apple's Calibration Assistant. Once you understand how the test work and parameters are set, it's easy to go through it in a few minutes and get the results you want (I had to try several times before I really nailed it).