Graphics Programs Reference
In-Depth Information
image has the value as
1
in any one of the RGB channels, the result will be a full
white image signifying a value of 1 in any of the colors, existing as the maximum
value in any of the channels.
Luminance
When we see the colors, we can perceive perceive blue as dark color compared to
Cyan and Yellow as bright compared to red. This variation in brightness that we per-
ceive is called the
luminance
of the color.
Luminance of an image can be displayed using the
RGB to BW
node. The following
screenshot illustrates the luminance levels of colors when using the RGB to BW
node:
Tip
It has to be understood that the desaturation of an image is not the same as mak-
ing it into a black-and-white image.
Luminance of the same image, when displayed as a
Y
channel in the
Separate
YUVA
node, also shows the variation of brightness in colors, as shown in the follow-
ing screenshot:
