GLOSSARY - COLOUR

 

  CGI
  Colour Bit Depth
  Colourometry
  Colour Space
  Contrast
  Gamut
  Longitudinal Secd Spectrum
  Luma
  RGB
  YCbCr
  YUV
     
ENCODING
LOGIC
OPTICS
PERSONNEL

 

 

YUV
  • YUV refers to a colour transmission system where the LUMA is encoded separately from two colour components, U and V

It is often used in computing to refer to any such non-RGB system. It is now used more or less interchangeably with Y'CbCr (and YPbPr - the analogue version of Y'CbCr).

Although YUV has a history in the development of analogue colour television and there are technical differences in the calculation and scale of the colour components, for practical purposes YUV, Y'CbCr and YPbPr can be considered the same.

 

 

YCbCr
  • Correctly written Y'CbCr or, in analogue video YPbPr.
  • Y'CbCr is a component video system which represents RGB colour space in a bandwidth-efficient form for storage and transmission, it is not a colour space of its own.
The CbCr plane given a constant Y' of 0.50

Y' refers to the the LUMA component of the signal, Cb to the difference between the LUMA and the blue component, Cr to the difference between the LUMA and the red component.

The system requires processing power in order to convert the RGB colour space into Y'CbCr for storage or transmission, and back for display. However, the system lends itself to far more efficient transmission by allowing available bandwidth to be concentrated on the most critical component in terms of visual information, the LUMA, while reducing that allocated to the colour components or by utilising compression, subsampling or other means.

There is no need for a green difference component as this can be calculated by taking the LUMA component and removing the blue and red components given by the difference data Cb and Cr.

 


CREDITS: Thanks to Roger Bowles ACO for his continued work in compiling this glossary.



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