Yy

Y
(1) symbol for yellow in process reproduction; (2) one of the three CIE trisimulus values, the green primary; (3) spectral color matching function of the CIE Standard Observer used for calculating y stimulus values; (4) one of the CIE chromaticity values.

y
the ordinate in mathmatics.

y²
abbreviation for square yard.

y³
abbreviation for cubic yard.

yard
a measure of length equal to 36 inches or 3 feet and equivalent to 0.9144 meter; abbreviation is yd.

yard, cubic
refer to cubic yard.

yard goods
(1) wide rolls of uncut textile substrate, available in varying length; (2) piece goods.

yard, square
refer to square yard.

yarn
a continuous strand of twisted threads of natural or synthetic material.

yarn distortion
shift in the warp of a fabric due to localized surface tension.

y-axis
the vertical axis of a three dimensional coordinate system.

YCC
A color space developed by Eastman Kodak to define colors by luminance (Y) and two levels of chrominance (C and C).

y-coordinate
the vertical location of data on a graph, display monitor, or page layout.

yd
abbreviation for yard.

yel
abbreviation for yellow.

yellow
(1) one of the subtractive primaries used in process printing with a wavelength of approx 580 nanometers; (2) a pigment or dye having this hue.

yellowing
a defect manifested by a change in color toward a yellowish hue.

yellow light
refer to safelight.

yellow ocher
a yellow pigment usually containing lemonite.

yellow printer
in process color reproduction, the prepress materials used to produce the yellow image. (The letter Y is used to designat this color).

yellow safe film
a blue sensitive film used primarily for contacting that is light safe under yellow light.

yellow sheeting
the transparent yellow plastic or gelatin sheeting through which autopositive film is exposed.

yield point
a point where mesh elastic memory breaksdown and is no longer able to hold tension.

yield strength
refer to yield value.

yield stress (yield point)
the minimum load required to permanently deform a plastic material.

yield value (yield strength)
(1) the flow properties of a printing ink.; (2) lowest stress a material undergoes in plastic deformation. (Below this stress the material is elastic and above it the material is tensile or viscous).

YMC
acroynm for yellow, magenta, cyan in process color reproduction.

YMCK
symbol for yellow, magenta, cyan, and black in process color reproduction.

yoke
the part of a garment fitted closely to the shoulders.

Young-Helmholtz theroy
a color vision theroy that suggests humans percieve color based on messages received from three receptors in the eye (red, green, blue).

Young’s modulus
ratio of normal stress to corresponding strain for tensile or compressive stresses at less than the proportional limit of the material; also refer to modulus of elasticity.

Yule-Nielsen equation
a modification of the Murray-Davies equation to compensate for light scatter within a substrate when measuring apparent printed dot gain; also refer to Murray-Davies equation.