Glen H , Dec 31, 2008; 06:03 a.m.
You have a problem for which there may not be a solution. First thing is you have to correctly color calibrate your monitor ( I am assuming you are working in color). There are several good calibration devices. Spyder and X-rite calibration devices for monitors are reasonably priced. Pantone makes a very well priced device but I have no experience with it. The second thing is to calibrate the printer. Here is where you have a problem, since you have no control over the
CostCo printer. Optimally you would be able to color calibrate the printer and apply profiles for the type and brand of photo paper you are using. If you want to print what you see in the monitor, you need your own photo printer and calibrate it yourself; ( Same companies above make color printer calibrating devices) and then obtain the paper profiles over the internet from the manufacturer. Finding what paper CostCo uses should be pretty easy, but what type of printers they use is more difficult and how and what they use for color calibration, if anything is very difficult. Most important is color calibrate your monitor, then see if you still have a problem. Good Luck.