If you send us a file for printing we make some slight adjustments to it beforehand. These changes are part of the colour management process that is necessary to compensate for the printing paper we use, the printing ink we use, and the printer on which your job will be made. Your file is not altered in any way. The adjustments are made by our computer each time your file is sent to our printer.
You cannot allow for any of these changes that we make to the output of your file. They are unique to our equipment. If you think the finished result is too pink then you can adjust your file accordingly, or we can do that for you. It is perfectly reasonable to expect things to be "right" for you. Such tweakings are personal, and do not come under the normally accepted processes of colour management, which is a carefully designed scientific calibration.
Our printers are calibrated for each of the types of ink we use (dye and pigment inks have widely different characteristics), and for each of the papers we use. The profiles that are prepared are used by our software to obtain optimum results. A separate profile is needed for each printer-ink-paper combination. Profiles cost £125 each to prepare. You don't have to pay that, unless you wish us to use a particular type of paper that we have not profiled already.
A test file, of hundreds of different colours, is printed by the chosen printer, using ink made to a high standard (so we stick to one brand), on paper that is also carefully made and tested to be of consistent quality. The print from this file is measured and calibrated using laboratory equipment and software that costs thousands of pounds. From this the necessary colour management profile is prepared.
We have described, very briefly, the colour management required for the best printed results from a computer file. For best results the camera or scanner also needs to have its own profile, and the computer screen also needs to be profiled. Your software needs to be able to use these profiles. These tasks are your responsibility. Most modern cameras and scanners have acceptable profiling built-in. Good quality software allows for profiling. Screens can be profiled with relatively inexpensive equipment (from around £100), but once the buttons have been tweaked a new profile has to be made. The learning curve is very steep, and very long.