Color of paper and paperboard (45/0, C/2), Test Method TAPPI/ANSI T 524 om-20
This method specifies a procedure for measuring the color of paper or paperboard with tristimulus filter colorimeters or spectrophotometers incorporating directional (45/0) geometry and CIE (International Commission on Illumination) illuminant C.
In the method, tristimulus values X (red), Y (green), and Z (blue), appropriate to the CIE-1931 (2°) standard observer, are calculated from reflectance measurements Rx, Ry, and Rz. or from R (l) data. Color can then be expressed in various color space systems:
1. Hunter L, a, b
2. CIE L*, a*, b*
3. L*, C*, h
4. Dominant wavelength, purity, luminosity
5. Color difference, [DE, DE*, DE*94, DE (CMC)]
Color of paper and paperboard (45/0, C/2), Test Method TAPPI/ANSI T 524 om-20
