Can someone please explain the difference between calibrating a paper and profiling it?
Thanks loads, John
Paper calibration on some devices is critical. Some device, either a densitometer or better a Spectrophotometer (for papers with optical brighteners) is used to measure the white of the paper for printing calibration. I just did a lot of testing with an HP Indigo digital press and this is such a beast that requires proper paper calibration for each paper used.
A profile fingerprints the entire printing process by reading LAB or spectra data from a large sample of color patches. It defines the printer's color space (and does also take paper white into account). The ink comes into the picture at this point.
Calibration is often a process for a non stable device or when you're using media that isn't clearly understood/defined.