Global color estimation of special-effect coatings from measurements by commercially available portable multiangle spectrophotometers

Fang, Liang; Jia, Hongzhi; Zhang, Hai; Liu, Baiying

doi:10.1364/josaa.32.000001

Cited by 13 publications

(7 citation statements)

References 21 publications

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“…This instrument has been recently used to study coatings with interference pigments widely used in automotive industry, in order to provide with general key geometries for their characterization [8][9][10]. In this work, we take advantage of this previous experience in the study of coatings with interference pigments to propose a general methodology for the characterization of coatings with diffraction pigments.…”

Section: Introductionmentioning

confidence: 99%

Color characterization of coatings with diffraction pigments

et al. 2016

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Coatings with diffraction pigments present high iridescence, which needs to be characterized to describe their appearance. The spectral Bidirectional Reflectance Distribution Function (BRDF) of six coatings with SpectraFlair diffraction pigments were measured using the robot-arm-based goniospectrophotometerer GEFE, designed and developed at CSIC. Principal Components Analysis (PCA) has been applied to study the coatings' BRDF data. From data evaluation and based in theoretical considerations, we propose a relevant geometric factor to study the spectral reflectance and color gamut variation of coatings with diffraction pigments. At fixed values of this geometrical variable, the spectral BRDF component due to diffraction is almost constant. Commercially-available portable goniospectrophotometers, extensively used in several industries (automotive and others), have to be provided with more aspecular measurement angles to characterize goniochromatic coatings based on diffraction pigments.

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Section: Introductionmentioning

confidence: 99%

Color characterization of coatings with diffraction pigments

et al. 2016

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“…to understand and manage pro‐actively its macro‐optical and visual impact. Although several international optical metrology institutes have calibrated multiangle‐spectrophotometers available with the capability to measure from several tens to thousands of measurement geometries, the current trends in color industry are towards saving time and measuring correctly and efficiently in order to obtain and manage the maximum optical and visual information for quality management.…”

Section: Introductionmentioning

confidence: 99%

Review of instrumental inter‐agreement study of spectral and colorimetric data of commercial multiangle spectrophotometers

Perales

Micó-Vicent

Huraibat

et al. 2018

Color Research & Application

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Several different instruments have been introduced into the market to obtain good color characterization for different measurement configurations. These commercial instruments have different optical and working configurations, however, the measurement data provided by each instrument should be similar to have good consistency when comparing them to each other measuring the same sample material. Therefore, the purpose of this work was to apply an inter‐model agreement study of spectral and colorimetric data of three instruments (CM‐M6, BYK‐mac‐I, and MA98). Two different statistical tests were applied following ASTM recommendations. In general, the measurement geometries close to the specular direction and the flop direction showed greater deviations. In addition, the partial color differences calculated for the comparison of MA98 versus CM‐M6 were larger than the BYK‐mac‐i versus CM‐M6 comparison. Finally, it can be concluded that most of the measurement geometries were statistically significantly different from each other which means that these differences were due to systematic or bias errors and not exclusively to random errors.

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“…All of these renderers require specialist hardware, such as fast graphics cards, and would not render real-time on more modest hardware such as a tablet computer. Similar to earlier work, we will describe the lighting environment by global illumination models [15,[18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Visual validation of the appearance of chromatic objects rendered from spectrophotometric measurements

Huraibat¹,

Perales²,

Kirchner³

et al. 2021

J. Opt. Soc. Am. A

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We validate a physically based and spectral rendering framework with improved color reproduction. With a recently developed model, we take into account both the colorimetric specifications of the rendering display as well as the spectral and angular characteristics of lighting and also the spectral reflectance of the objects. Therefore, it should provide much better color reproduction than those based on the common standard red, green, blue (sRGB) color space. In addition, it allows real-time rendering on modest hardware and displays. We evaluated the color reproduction of the new rendering framework by psychophysical tests using spectrophotometric measurements of 30 chromatic paint samples. They were rendered on an iPad display, as viewed inside the Byko-spectra effect light booth. We asked 16 observers to evaluate the color match by directly comparing the rendered samples with the physical samples, using two different psychophysical assessment methods. The color reproduction was found to be strongly improved with respect to results obtained with default sRGB color encoding space. The average color reproduction match was found to be equivalent to E 00 = 1.6 , which is a small but noticeable color difference. In 80% of the visual assessments, the color reproduction was described as being at least as good as between "difference visible but still acceptable" and "difference visible, doubtful match."

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Global color estimation of special-effect coatings from measurements by commercially available portable multiangle spectrophotometers

Cited by 13 publications

References 21 publications

Color characterization of coatings with diffraction pigments

Color characterization of coatings with diffraction pigments

Review of instrumental inter‐agreement study of spectral and colorimetric data of commercial multiangle spectrophotometers

Visual validation of the appearance of chromatic objects rendered from spectrophotometric measurements

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