PU-4010 6-1
Chapter 6 Appendix
Differences Between the Human Eye and Instrument Optics
There are inherent differences between the colors that are perceived by the human eye and
those that are detected by any instrument optical system. The human eye is capable of
detecting minute differences in shade and very small areas of color; artificial optical systems
are less sensitive to such small changes. Conversely, instrumental optics are capable of
detecting certain colors that are masked by, or blended with, other colors to the human eye.
For this reason, exact agreement between visual results and instrument results might not be
found. However, agreement is generally within one visual block or reported level and is equal
to, or better than, the agreement between two visual readers.
6-1 Addendum
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