How can you match up the colour from camera to comuter to printer? -

You are pretty much asking you pretty much asking how to make an apple into a steak. Printers print in a CYMK spectrum and Cameras Capture is a RGB. One image is based upon absorption of light, the other reflection. One option is that in higher end printers you can manually adjust your color saturation in you advanced printer properties. This is an extremely tedious task and you can after many hours get close, however a perfect match is not likely to happen.

You may not an exact match usually just close enough in general.