The three component signals are created from an original
(red, green and blue) source. The weighted values of
,
and
are added together to produce a single
signal, representing the overall brightness, or luminance, of that spot. The
signal is then created by subtracting the
from the blue signal of the original
, and then scaling; and
by subtracting the
from the red, and then scaling by a different factor.
These formulae approximate the conversion between the RGB colour space and
.

From RGB to YDbDr:

From YDbDr to RGB:

You may note that the
component of
is the same as the
component of 

.
and
are related to the
and
components of the YUV colour space as follows:

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