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What Is CRI Color Rendering Index?

In photography and video recording, the CRI of a light source such as a light bulb, is a somewhat important measurement for determining the level of accuracy of revealing the colors of an object in comparison to an ideal light source; the two light sources need to have the same CCT or Correlated Color Temperature that is expressed in Kelvin (K).

Note: the method of measuring the CRI applies to human vision; if you want to know how well a photo camera or video camera renders color, CRI is not very useful.

What is an ideal light source?, and what is a useful method for measuring color rendering accuracy of a camera? are questions that are discussed in further detail in the video "Principles of Video Lighting Seminar 2, CRI Color Rendering Index: