These deviations are measured over many colours and a profile is created for the specific device. With cameras and scanners, you take a colour chart and compare the result with the values expected for the colour chart. In general, profiling is carried out by getting the device to show a colour and then measuring with a measurement sensor to see how much the displayed colour deviates from the desired colour. The best thing would be to create a tailor-made profile for each device and update it regularly. The more accurate and up-to-date these device profiles are, the better the colours are matched. The quality of a colour-accurate process depends not only on the quality of the devices involved but also on the quality of the profiles used for them.
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