Image Processing Reference
In-Depth Information
520
530
540
510
550
H
560
570
G
500
580
X
590
600
610
R
630
W
680
490
480
B
470
470
460
460
420
420
Fig. 2.4. The definition of hue and purity
luminosity are represented by the same point. The pure hue is defined via the normal-
ized color components x, y and is to be found at the boundaries, where the dominant
wavelength of photons producing this color is also read out. The point marked as H
in the figure is a pure hue, whereas less pure colors of the same hue are to be found
on the line segment between W and H . The point H has the purity 1, while the point
marked as X has the purity WX
WH
representing the distance from W
to X . The point X is the complementary color of X , and is found in the opposite
direction, but with the same purity, WX
WH
with
WX
= WX
WH
. The point H
is the boundary
point obtained by mirroring H through W .
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