Multi-spectral Analysis of the Oriental Watercolor Painting on Rice Paper
Multi-spectral approach is used to analyze the oriental watercolor painting on these two kinds of rice paper. Special attention is on the interaction of the “paper white” of the rice paper with the pigments for oriental water color. Color ramps were made with pigments and dyes taken from active artist. Two Macbeth D65 solar lights were used as the illumination. Minolta CS-1000 spectral-radiometer was used to measure the spectral information (380nm to 780nm in 1 nm increment) on both the color ramps and a reference white standard. The spectral reflectance of each sample was derived from the reference white standard.
Base-vectors of the solid color blocks and both types of the rice paper are measured. Color modeling is performed to find the right transformation to achieve linearity when reconstructing the spectral reflectance by the mixing of paper base and color primaries.
Results indicate that the simple-subtractive mixing model is not suitable for this oriental watercolor painting as shown in Fig. 1, where scalability can not be achieved after normalizing each color tint with the maximum value. It is concluded that complex subtractive mixing model is needed to reconstruct the spectral reflectance of the oriental watercolor painting. With further analysis by Kubelka-Munk model and Principal Component Analysis (PCA), it is possible to find a linear model to separate the spectral characteristics of the rice paper from the pigments or dyes painted. This will provide a first step in trying to rebuild the original look of some ancient watercolor paintings which become not very visible due to the darkening by the aging of the rice paper.
Document Type: Research Article
Publication date: January 1, 2008
Started in 2002 and merged with the Color and Imaging Conference (CIC) in 2014, CGIV covered a wide range of topics related to colour and visual information, including color science, computational color, color in computer graphics, color reproduction, volor vision/psychophysics, color image quality, color image processing, and multispectral color science. Drawing papers from researchers, scientists, and engineers worldwide, DGIV offered attendees a unique experience to share with colleagues in industry and academic, and on national and international standards committees. Held every year in Europe, DGIV papers were more academic in their focus and had high student participation rates.
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