Tektronix LumaColor II J18, Instruction Manual

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Appendix B: Chromaticity Reference
B–6 J18 Photometer Instruction Manual
The 1976 CIE-UCS Chromaticity Diagram
The 1976 CIE-UCS (Uniform Chromaticity Scale) diagram, shown
in Figure B–4, can be used to categorize chromaticity measurements
expressed as u
i
, v
i
values. u
i
and v
i
are related to the x and y values
of the 1931 CIE chromaticity diagram by the following equations:
u
Ȁ +
4x
*
2x
)
12y
)
3
v
Ȁ +
9y
*
2x
)
12y
)
3
This diagram is similar to the 1931 CIE chromaticity diagram except
for the following:
H
Equal distances on the diagram represent approximately equal
perceived color differences.
H
The equal energy point is u
i
= 0.210, v
i
= 0.473.
Appendix B: Chromaticity Reference
B–6 J18 Photometer Instruction Manual
The 1976 CIE-UCS Chromaticity Diagram
The 1976 CIE-UCS (Uniform Chromaticity Scale) diagram, shown
in Figure B–4, can be used to categorize chromaticity measurements
expressed as u
i
, v
i
values. u
i
and v
i
are related to the x and y values
of the 1931 CIE chromaticity diagram by the following equations:
u
Ȁ +
4x
*
2x
)
12y
)
3
v
Ȁ +
9y
*
2x
)
12y
)
3
This diagram is similar to the 1931 CIE chromaticity diagram except
for the following:
H
Equal distances on the diagram represent approximately equal
perceived color differences.
H
The equal energy point is u
i
= 0.210, v
i
= 0.473.