Predicting the performance of low-cost color instruments for color identification

Kirchner, Eric; Koeckhoven, Pim; Sivakumar, Keshav

doi:10.1364/josaa.36.000368

Cited by 4 publications

(5 citation statements)

References 4 publications

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“…is fact may be of interest to researchers given the large volume of data emerging on the potential mechanical superiority of glass ionomers reinforced with silver nanoparticles [16,17]. e use of the L * a * b color axes for the measurement of color change is universally accepted as a better method than using more subjective shade guides [18,19]. However, the accuracy of the system viewed keeping in mind that while values for ΔE * between 1 and 3.3 can be detected by some observers in standardized conditions, a ΔE * value below 1 is generally considered imperceptible even to a trained eye [18].…”

Section: Discussionmentioning

confidence: 99%

“…e use of the L * a * b color axes for the measurement of color change is universally accepted as a better method than using more subjective shade guides [18,19]. However, the accuracy of the system viewed keeping in mind that while values for ΔE * between 1 and 3.3 can be detected by some observers in standardized conditions, a ΔE * value below 1 is generally considered imperceptible even to a trained eye [18]. All the materials used in this study displayed clinically perceptible color change, and the difference is color stability between the groups at each measurement interval which was above the clinical threshold of ΔE * � 1.…”

Section: Discussionmentioning

confidence: 99%

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Color Stability of Glass Ionomer Cement after Reinforced with Two Different Nanoparticles

Pani

Aljammaz

Alrugi

et al. 2020

International Journal of Dentistry

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Aim. This study aimed to compare the staining characteristics of a commercially available restorative glass ionomer cement to a formulation reinforced by the addition of carbon nanotubes and another formulation reinforced by the addition of silver nanoparticles to the powder of the same cement. Methodology. Twenty samples each of a control glass ionomer cement (PULPDENT® Glass Fill®, Pulpdent Corp. Watertown, MA, USA), control cement reinforced with 0.0006 gm (0.03% by weight) of carbon nanotubes (Sigma Aldrich, St Louis MO, USA), and control cement reinforced with 0.2 gm (10% by weight) of silver nanoparticles (Nanocyl™, Nanocyl SA, Sambreville, Belgium) were immersed in a staining solution. Color evaluations were carried out after 1 h, 24 h, and 1 week. Color change values were calculated. Results. The results indicated that carbon nanotube reinforced specimens exhibited less color stability when compared to controlled glass ionomer cement specimens; however, both samples had significantly greater color stability than silver nanoparticle reinforced glass ionomer samples. Conclusion. It can be concluded within the limitations of this study that carbon nanotube reinforced glass ionomer cements have better color stability than silver nanoparticle reinforced glass ionomer cements.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Color Stability of Glass Ionomer Cement after Reinforced with Two Different Nanoparticles

Pani

Aljammaz

Alrugi

et al. 2020

International Journal of Dentistry

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“…The NCS ColorPIN II instrument is also able to identify the NCS chip that is closest to a measured color. Given the number of chips in an NCS fan deck and the relatively uniform color differences between different NCS chips, we estimate that the NCS ColorPIN II instrument identifies the correct NCS code in at least 95% of the cases 21 . This makes the instrument attractive as an objective alternative to the subjective case where a human observer would need to browse through the NCS fan deck and try to find the color chip best matching the color found on a monument.…”

Section: Quantitative Approachmentioning

confidence: 99%

Quantifying the color palettes of Naghsh‐e Jahan Square in Isfahan

Mohammadgholipour

Kirchner

Salleh

2020

Color Research & Application

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In the 1960s, Jean‐Philippe Lenclos introduced a structured methodology for determining the color palettes of urban environments. After half a century, this method is widely used all over the world. Since this process contains subjective and time‐consuming steps, we propose a quantitative improvement of Lenclos' methodology by introducing a fully digital procedure. This removes observer subjectivity and dependence on local illumination conditions. We applied the digital process to the four monumental buildings of Naghsh‐e Jahan Square in Isfahan, a masterpiece of world architecture. The resulting color palettes are more accurate than those obtained in earlier studies. We obtained more accurate color coordinates, characterized by a wider color gamut, and quantified color variations within buildings and between monuments as well.

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“…In the past decade, several new types of colorimeters have been developed and launched at prices below 500 USD (Kirchner, Koeckhoven, and Sivakumar 2019). Many of these colorimeters comprise a LED light source and a tristimulus color sensor, and are designed to be controlled wirelessly with a mobile smartphone or tablet via Bluetooth connection.…”

Section: Introductionmentioning

confidence: 99%

“…Many of these colorimeters comprise a LED light source and a tristimulus color sensor, and are designed to be controlled wirelessly with a mobile smartphone or tablet via Bluetooth connection. Some of them are sold at less than 100 USD (Kirchner, Koeckhoven, and Sivakumar 2019). Owing to the rapid global expansion of the smartphone users, these low-cost colorimeters have enabled a wide range of users other than scientists to measure the color of an object at a reasonable cost.…”

Section: Introductionmentioning

confidence: 99%

Comparison of visual and instrumental measurements of soil color with different low-cost colorimeters

Moritsuka

Kawamura

Tsujimoto

et al. 2019

Soil Science and Plant Nutrition

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Soil color has been conventionally measured using a Munsell soil color chart. Recently launched colorimeters can also measure the color of an object at a reasonable cost. This study was undertaken to evaluate to what extent such low-cost colorimeters (< 500 USD) can be useful for soil color analysis in the laboratory as compared with conventional colorimeters (> 3000 USD) and a Munsell soil color chart (about 200 USD). Sixty two air-dried soil samples collected from rice fields in Madagascar were subjected to two pretreatments for homogenization (2-mm sieving or additional hand-grinding) and instrumental analysis using four low-cost colorimeters (CS-10, Cube, Nix Pro, and Color Muse) and four conventional colorimeters (SPAD-503, CR-20, CR-400, and CR-410). The color of 2-mm sieved samples was also measured visually using a color chart. The effects of pretreatments and the analytical conditions were evaluated by the repeatability and stability of the measurement, the comparability of the soil color data obtained, and the time required for analysis. Overall, instrumental measurement was much more repeatable than visual observation. Both the repeatability and stability of the low-cost colorimeters tended to be lower than those of the conventional colorimeters. Among the low-cost colorimeters examined, soil color parameters (L*, a*, and b*) obtained with Nix Pro were most comparable (r > 0.97 for all parameters of 2-mm sieved samples) with those obtained with SPAD-503, which is an instrument designed specifically for soil color analysis. Additional hand-grinding pretreatment improved the repeatability of the instrumental analysis and reduced the subsample weight to two grams. However, this pretreatment also increased the L* value (lightness) of the samples, decreased the comparability with the data from 2-mm sieved samples, and prolonged the time required to complete the whole analysis. Among the various methods tested, 2-mm sieving of air-dried samples followed by the color measurement with Nix Pro several times per sample was considered the most cost-effective approach for measuring soil color in the laboratory.

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Predicting the performance of low-cost color instruments for color identification

Cited by 4 publications

References 4 publications

Color Stability of Glass Ionomer Cement after Reinforced with Two Different Nanoparticles

Color Stability of Glass Ionomer Cement after Reinforced with Two Different Nanoparticles

Quantifying the color palettes of Naghsh‐e Jahan Square in Isfahan

Comparison of visual and instrumental measurements of soil color with different low-cost colorimeters

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