Error stacking happens when physical samples are used for color measurement references in addition to visual evaluations. When you measure a physical sample and compare it to another physical sample, there will be small differences between the two. It is very similar to what happens when you make a copy of a photocopy. You will always get the best quality when you print directly from the source file on your computer. And, in the case of color measurement, you will get more accurate results when you compare the measured result to the original digital value of the intended color.
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