
Introduction to luma
and chroma 10
Video systems convey image data in the form of one
component that represents lightness, and two compo-
nents that represent color, disregarding lightness. This
scheme exploits the reduced color acuity of vision
compared to luminance acuity: As long as lightness is
conveyed with full detail, detail in the color compo-
nents can be reduced by subsampling (filtering, or aver-
aging). This chapter
introduces the concepts of luma
and chroma encoding; details will be presented in
Luma
and color differences,
on page 281.
Luma
A certain amount of noise is ...