Color measurement

 The UE of "Measurement of the Color" is an introduction UE to the colorimetry. It allows to understand the way we perceive the colors and how we classify them in the various colorimetric systems currently used. The course begins with a brief historical introduction tracing the most significant stages of the construction of colorimetry, then follows a chapter giving some notions of "neuro-physiology" of vision describing the functioning of the eye and the retina. Follows a chapter of photometry introducing the essential quantities to the colorimetry, in particular the spectral luminance then a study of the colorimetric systems such as RGB, XYZ or L*a*b*. The emphasis is put in these first chapters on the additive synthesis of colors which allows their production on screens (computer, TV, telephones, etc.). The course continues with an introduction to spectro-colorimetry which allows to understand the properties of color mixtures (subtractive synthesis) through its simplest models (Beer-Lambert, Kubelka-Munk, etc.). The course is illustrated by many exercises done in TD that allow to become familiar with the various colorimetric systems, their advantages and disadvantages. It is also supported by practical exercises which allow the student to master color measurement devices (colorimeters, spectro-colorimeters) as well as the associated software. An important part of the practical exercises is dedicated to the confrontation between observations and measurements of colors.

Master the key concepts of colorimetry, the usual color systems with their advantages and disadvantages. Know how to reference a color and communicate it. To know the apparatuses of measurement of the color and to know to use them through the dedicated software.

Historical introduction, natural classification of colors and Munsell's atlas, functioning of the eye and the retina, photometry, foundations of colorimetry, visual trivariance, RGB system, CIE XYZ and xyY system, physiological L*a*b* system, introduction to spectro-colorimetry, light-matter interaction, Beer-Lambert and Kubelka-Munk models and their use in formulation.