COLOR FROM THE METROLOGICAL STANDPOINT

摘要

The principal types of instrument for measuring colors are de fined in terms of the three tristimulus values X, Y, Z. They are:the spectrophotometer, the visual or photoelectric colorimeter, direct or differential seasuring instruments and devices for comparing adjacent colors.nAll have three separate electorates in common:light source, optical system and oeasuriag device.nFour criteria are defined for assessing the de-grot of accuracy of each type. It is shown that a choice mast be Bade of a principle for measuring the modifying factor a and of the type of apparatus to be used. This choice will be determined by the nature of the colorimetric problem involved.