Monday, 13 January 2014

Brightness, Whiteness and Color

Brightness is referred as the proportion of reflectance of blue beam only at a wavelength of 457 nm. Whiteness refers to the degree that paper diffusely replicate beam of all wave lengths right through the visible band. Whiteness is an appearance phrase. Color is a visual value. Color might appear dissimilar when viewed underneath a diverse light source. Brightness is randomly defined, but cautiously standardized, blue reflectance that is used throughout the pulp and paper industry for the managing of mill processes and in definite types of R&D programs. Brightness is not whiteness. However, the brightness values of the pulps and pigments available into the paper offer an exceptional measure of the maximum whiteness that can be achieved with accurate tinting. The color of paper, like of other materials, depends in a complex manner on the characteristics of the observer and a numeral of substantial factors such as the spectral energy division of the illuminant, the geometry of illuminating and screening, the nature and scope of the encircle and the ocular characteristics of the paper itself.

Color is related to perception and therefore measured or specified in terms of color space. A commonly used system is the CIE L, a, b system. This is based on the idea of color opposites.
 L - Measure of luminance and varies from 100 for perfect white to 0 for perfect black.
a - Redness to greenness.
b - Yellowness to blueness.

Goodrich Agrochem’s Coating & Laminating Binder products are an excellent carrier for optical brightening agent & pigments.

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