Color And Vision Groupuniversity Of Alicantecarretera Of San Vicente Del Raspeig 03690Alicante Spain

Spain

Color And Vision Groupuniversity Of Alicantecarretera Of San Vicente Del Raspeig 03690Alicante Spain

Spain
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Perales E.,Color And Vision Groupuniversity Of Alicantecarretera Of San Vicente Del Raspeig 03690Alicante Spain | Martinez-Verdu F.,Color And Vision Groupuniversity Of Alicantecarretera Of San Vicente Del Raspeig 03690Alicante Spain
Color Research and Application | Year: 2017

For improving color reproduction accuracy of mobile displays, we recently developed a generic model for device-specific display characterization model that also accounts for the influence of illuminance from ambient light. In the present article, this MDCIM model (Mobile Display Characterization and Illumination Model) is applied to a Samsung Galaxy S4 display, representing OLED displays. The performance of the model was tested by determining the values of all model parameters using publicly available technical data only. We organized visual tests under various ambient illuminance levels from 600 to 3000 lux. Seven observers compared the color of displayed images with the color of physical samples. With the MDCIM method, the quality of the color match was shown to improve considerably as compared to using only device-independent encoding color space. On a five-point scale to quantify color reproduction accuracy, the MDCIM resulted in more than 1 unit improvement at 1000 lux illuminance. At lower and higher illuminance, the improvement was even larger. Color reproduction accuracy was found to be at least reasonable, according to the subjective assessment of visual observers, for more than 75% of the samples when using the MDCIM method, but only 20% or less when using the common device-independent encoding color space. © 2017 Wiley Periodicals, Inc.


Gomez O.,Color And Vision Groupuniversity Of Alicantecarretera Of San Vicente Del Raspeig 03690Alicante Spain | Perales E.,Color And Vision Groupuniversity Of Alicantecarretera Of San Vicente Del Raspeig 03690Alicante Spain | Chorro E.,Color And Vision Groupuniversity Of Alicantecarretera Of San Vicente Del Raspeig 03690Alicante Spain | Burgos F.J.,Technical University Of Catalonia Upc Rambla Of Sant Nebridi | And 4 more authors.
Color Research and Application | Year: 2015

The interest in gonioapparent pigments (metallic, pearlescent, interference, or diffractive) has increased in the last few years, especially for applications in the automotive industry. To assure a proper characterization of colors with gonioapparent pigments, commercial devices have appeared to characterize the color in different geometries, which are called multiangle spectrophotometers. As the gonioapparent pigments and multiangle instruments are relatively new, no studies exist regarding the instrumental-based procedure followed in the industry, and if the results provided are in agreement with the observer perception. Consequently, the main objective of this study was to examine the correlation of the instrumental color differences with visual assessments. The instrumental color difference was calculated with the color difference formula AUDI2000 (specific for this sector) between the pairs of similar samples of three types of coated panels (solid, metallic, and pearlescent). The values measured by a telespectroradiometer in a directional lighting booth and the colorimetric values obtained by means of a multiangle spectrophotometer BYK-mac were considered for this purpose. Additionally, a visual experiment was conducted to quantify the color difference by using the gray-scale method. The results revealed that an acceptable instrumental correlation existed despite the visual and the instrumental correlation being worse. In particular, it was checked that observers accepted a larger number of color pairs, that is, the visual color difference was smaller than the tolerance demanded by the industry (derived from AUDI2000). © 2015 Wiley Periodicals, Inc.

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