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Color change due to a varnish layer

Color change due to a varnish layer The presence of a varnish layer modifies the light scattered and reflected by a painting. A general equation, valid for any bidirectional configuration, allows the expression between the final and initial diffuse reflectance by taking into account the influence of the different interfaces. This equation can be simplified to a homothetic relationship. In this case, the final colorimetric coordinates are directly expressed in terms of the initial coordinates. The results are then compared with the exact computations. Hue is not affected by the addition of a varnish. Lightness and chroma variations depend on the refractive index of the paint (np) to that of the varnish (n). If np > n, lightness and chroma increase. Conversely, if np > n, lightness always decreases, but chroma increases for light initial painting and chroma decreases for dark ones. © 2004 Wiley Periodicals, Inc. Col Res Appl, 29, 196–204, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/col.20008 http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Color Research & Application Wiley

Color change due to a varnish layer

Color Research & Application , Volume 29 (3) – Jun 1, 2004

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References (12)

Publisher
Wiley
Copyright
Copyright © 2004 Wiley Periodicals, Inc.
ISSN
0361-2317
eISSN
1520-6378
DOI
10.1002/col.20008
Publisher site
See Article on Publisher Site

Abstract

The presence of a varnish layer modifies the light scattered and reflected by a painting. A general equation, valid for any bidirectional configuration, allows the expression between the final and initial diffuse reflectance by taking into account the influence of the different interfaces. This equation can be simplified to a homothetic relationship. In this case, the final colorimetric coordinates are directly expressed in terms of the initial coordinates. The results are then compared with the exact computations. Hue is not affected by the addition of a varnish. Lightness and chroma variations depend on the refractive index of the paint (np) to that of the varnish (n). If np > n, lightness and chroma increase. Conversely, if np > n, lightness always decreases, but chroma increases for light initial painting and chroma decreases for dark ones. © 2004 Wiley Periodicals, Inc. Col Res Appl, 29, 196–204, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/col.20008

Journal

Color Research & ApplicationWiley

Published: Jun 1, 2004

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