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Le Moan, Steven; Tanksale, Tejas Madan; Byshko, Roman; Urban, Philipp

An Observer-Metamerism Sensitivity Index for Electronic Displays

2017

Journal of the Society for Information Display

The effect of observer metamerism induced by electronic displays depends to a large extent on their primary spectra (red, green, and blue in the most common case). In particular, for narrow-band primary spectra whose peak wavelength lies in the range of high variability of the observer's colormatching function, some observers can experience very large differences between actual surface colors (e.g. in a light booth) and displayed colors if the monitor is optimized for the International Commission on Illumination (CIE) 1931 standard observer. However, because narrow-band light-emitting diodes lead to larger color gamuts, more and more monitors with very narrow band primaries are coming onto the market without manufacturers taking into account the associated problem of observer variations. Being able to measure these variations accurately and efficiently is therefore an important objective. In this paper, we propose a new approach to predict the extent of observer metamerism for a particular multiprimary display. Unlike existing dedicated models, ours does not depend on a reference illuminant and a set of reflectance spectra and is computationally more efficient.

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Tanksale, Tejas Madan; Urban, Philipp

Trichromatic Reflectance Capture Using a Tunable Light Source: Setup, Characterization and Reflectance Estimation

2016

Measuring, Modeling, and Reproducing Material Appearance 2016

Measuring, Modeling, and Reproducing Material Appearance (MMRMA) <2016, San Francisco, CA, USA>

Electronic Imaging, 9

A research project is underway to develop a gonio imager particularly dedicated to sample the Bidirectional Reflectance Distribution Function (BRDF) of materials and material compositions employed and created by multimaterial 3D printers. It comprises an almost colorimetric RGB camera and a spectrally tunable light source. In this paper, we investigate an important part of this system, particularly the approach to estimate reflectances from RGB values acquired under multiple illuminants. We first characterize the system by estimating the spectral sensitivities of the camera. Then, we use the sensitivities, a set of illuminants produced by the tunable light source and the corresponding sensor responses to estimate reflectances. For evaluating this approach, we measure the Neugebauer primary reflectances of a polyjet printer employing highly translucent photo-polymer printing materials colored in cyan, magenta, yellow and white. Spectral and colorimetric deviations to spectroradiometric comparison measurements (average 0.67 CIEDE2000 units / 0.0286 spectral RMS) are within the inter-instrument variability of hand-held spectrophotometers used in graphic arts for prints on paper.

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Vu, Bui Minh; Urban, Philipp; Tanksale, Tejas Madan; Nakauchi, Shigeki

Visual Perception of 3D Printed Translucent Objects

2016

24th Color and Imaging Conference

Color Imaging Conference (CIC) <24, 2016, San Diego, CA, USA>

In order to reproduce translucent objects by 3D printers employing fully transparent (or clear) material, modeling the human visual perception of translucency is crucial. In this preliminary study, a set of 256 texture-less samples was created by mixing white and clear materials using multi-jet 3D printing. The samples differ in both lateral light transport properties and transmittance. Two psychophysical experiments were conducted to reveal the relationship between transmittance and a perceptually uniform scale for translucency. The results show that Stevens' power law describes well this relationship within the optically thin range of samples. Furthermore, the sensitivity to lateral light transport is small compared to transmittance for the texture-less sample set.

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Arikan, Can Ates; Brunton, Alan; Tanksale, Tejas Madan; Urban, Philipp

Color-Managed 3D-Printing with highly Translucent Printing Materials

2015

Measuring, Modeling, and Reproducing Material Appearance 2015

Measuring, Modeling, and Reproducing Material Appearance (MMRMA) <2, 2015, San Francisco, CA, USA>

Many 3D printing applications require the reproduction of an object's color in addition to its shape. One 3D printing technology, called multi-jetting (or poly-jetting), allows full color 3D reproductions by arranging multiple colored materials (UV curing photo-polymers) on a droplet level in a single object. One property of such printing materials is their high translucency posing new challenges for characterizing such 3D printers to create ICC proles. In this paper, we will first describe the whole color-managed 3D printing workflow and will then focus on measuring the colors of highly translucent printing materials. We will show that measurements made by spectrophotometers used in the graphic arts industry are systematically biased towards lower reflection. We will then propose a trichromatic camera-based approach for measuring such colors. Error rates obtained in comparison with spectroradiometric measurements for the same viewing conditions are within the interinstrument-variability of hand-held spectrophotometers used in graphic arts.