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4:4:4 - One of the ratios of sampling frequencies used to digitize the luminance and color difference components (Y, B-Y, R-Y) or, more usually, the RGB components of a video signal. In this ratio there is always an equal number of samples of all components. RGB 4:4:4 is commonly used in high-end post including that used for digital cinematography.

In the converged media world, big screen requirements for cinema demand a new high level of picture quality. Film is commonly scanned in RGB for digital intermediate and effects work, and recorded directly to disks. The signal is then kept in the RGB form all the way through the DI process to the film recorder – making the best use of the full RGB data. For the rapidly growing market of digital cinema exhibition the DCI has recommended X ́Y ́Z ́ chromaticity which can be derived from RGB using a 3D LUT.