5Reference Projector and Environment

Since the XYZ′ color encoding for digital cinema distribution is an output-referred image state, it is critical that the reference projector that is used for the creative color grading decisions is characterized colorimetrically and calibrated to a common standard. Furthermore, because such imaging parameters as contrast and color gamut constrain what can be displayed, and therefore constrain the creative process, it is necessary to define some minimum performance parameters for the projector to be used in high quality mastering and cinema reproduction. The environment of the mastering room, particularly the ambient light, also influences the quality of the projected image.

These reasons drove DCI and SMPTE ...

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