scholarly journals The Role of Scale Adjustment in Color Change Evaluation

Instruments ◽  
2019 ◽  
Vol 3 (3) ◽  
pp. 42 ◽  
Author(s):  
Gueli ◽  
Pasquale ◽  
Politi ◽  
Stella
Keyword(s):  
Color Change ◽  
High Reliability ◽  
Research Work ◽  
Color Space ◽  
Color Difference ◽  
Color Measurement ◽  
Cielab Color Space ◽  
Archaeological Excavations ◽  
Cielab Color

The aim of this research work was to assess the influence of different scale adjustment conditions on both color measurement and color difference quantification and, in particular, to determine the best procedure to follow for a high-reliability protocol. This issue is very important in the Cultural Heritage field and, above all, in color measurement, which is carried out at different times during conservation and restoration campaigns or during archaeological excavations. Color change evaluation, performed by way of spectrophotometric measurements under different scale adjustment procedures on selected samples represented by colored reflectance standards and colored paintings, aimed to obtain results not only on ideal samples (certified standards) but also on real case studies (paintings). The study was conducted by focusing on the coordinates of the CIELAB color space and, in particular, on the calculation of the ΔE*ab quantity. The results show the introduction of nonsystematic variation with different scale adjustment procedures independent of materials and hue.

The Analysis for Evaluation of Ceramic Tile’s Color Difference Based on CIELAB Color Space

2012 ◽  
Vol 490-495 ◽  
pp. 3726-3732
Author(s):  
Zhe Min Dai ◽  
De Sheng Li ◽  
Hu Xie
Keyword(s):  
Quality Evaluation ◽  
Color Space ◽  
Great Influence ◽  
Color Difference ◽  
Evaluation Index ◽  
Ceramic Tiles ◽  
Cielab Color Space ◽  
Quality Testing ◽  
Different Color ◽  
Cielab Color

The color difference is one of the important evaluation index in ceramic tiles quality evaluation. So a good color difference evaluation index selecting has a great influence to the ceramic tile’s quality testing. In this paper, by computing and analyzing different color difference evaluation index, it is shown that CIE2000 formula is robust and feasible in ceramic tiles quality evaluation.

Color changes of ash wood (Fraxinus excelsior L.) caused by thermal modification in air and steam

2021 ◽  
Vol 116 ◽  
pp. 21-27
Author(s):  
Jakub Gawron ◽  
Monika Marchwicka
Keyword(s):  
Color Space ◽  
Color Difference ◽  
Thermal Modification ◽  
Fraxinus Excelsior ◽  
Space Model ◽  
Color Changes ◽  
Cielab Color Space ◽  
Before And After ◽  
Total Color Difference ◽  
Cielab Color

Color changes of ash wood (Fraxinus excelsior L.) caused by thermal modification in air and steam. Ash wood samples of 20x20x30 mm were subjected to thermal modification in different conditions. The thermal modification was conducted in air at 190 °C and in steam at 160 °C. For both environments modification lasted 2, 6 and 10 hours. Samples color parameters were measured before and after thermal modification on the basis of the mathematical CIELab color space model. Changes in all parameters (L, a and b) were observed, the highest in lightness (L) - darker color. The total color difference (ΔE) and chromaticity change (ΔC) were calculated for all samples. The highest value of ΔE was obtained for wood modified in the air at 190 °C for 10 h. The highest value of ΔC was obtained for wood modified in steam at 160 °C for 10 h. However, the value obtained for wood modified in the air at 190 °C for 10 h were only slightly lower.

A Discussion on Printing Color Difference Tolerance by CIEDE2000 Color Difference Formula

2012 ◽  
Vol 262 ◽  
pp. 96-99 ◽  
Author(s):  
Hao Xue Liu ◽  
Bing Wu ◽  
Yu Liu ◽  
Min Huang ◽  
Yan Fang Xu
Keyword(s):  
Color Space ◽  
Color Difference ◽  
Experimental Results ◽  
Printing Industry ◽  
Cielab Color Space ◽  
Difference Formula ◽  
Different Color ◽  
Cielab Color

In ISO printing standards, a color difference tolerance of ΔE*ab=5 is used as a threshold. But CIELAB color space is not uniform enough so that the same color difference value represents different color difference sensation in different color area. It is proved that the color difference calculated by CIEDE2000 is closer to the human sensation, so ISO TC130 is discussing the possibility of replacing CIELAB color difference by CIEDE2000. An experiment was conducted, in which the color difference of typical printing colors, CMYKRGB, was calculated and test. The experimental results showed that the color difference tolerance of ΔE*ab=5 is corresponding to 0.95~6.42 by CIEDE2000, with the average of 3.30 ΔE*00. So a color difference tolerance of ΔE*00=3.3 or a somewhat looser value of ΔE*00=3.5 can be adopted as a new tolerance for printing industry.

A model for prediction of color change after tooth bleaching based on CIELAB color space

2017 ◽  
Author(s):  
Maria del Mar Pérez Gómez ◽  
Luis Javier Herrera ◽  
Rosa Pulgar ◽  
Ana Yebra ◽  
María José Rivas ◽  
...  
Keyword(s):  
Color Change ◽  
Color Space ◽  
Tooth Bleaching ◽  
Cielab Color Space ◽  
Cielab Color

Evaluation of change in color of denim fabric after various industrial washing processes with different fiber composition

2014 ◽  
Vol 11 (2) ◽  
pp. 107-110
Author(s):  
Mushtaq Mangat ◽  
A. Abbasi ◽  
Jakub Wiener
Keyword(s):  
Color Space ◽  
Color Difference ◽  
Fiber Composition ◽  
Obvious Change ◽  
Washing Machines ◽  
Difference Formula ◽  
Denim Fabric ◽  
Cielab Color

Traditional denim made by using 100% cotton and novel denim made by using cotton in warp and spun PP in the weft were treated in 11 different ways on industrial garment washing machines with the help of various textile auxiliaries and pumice. There is an obvious change in color of denim. This change was measured by using Spectrophotometer. Reflectance was taken as a variable to observe the intensity of change. Color difference was measured by using the CIELab color difference formula 1976. Color space coordinates (L*, a*, b*) and color difference ΔE were calculated between the untreated denim and treated denim.

scholarly journals Influence of UV Radiation on the Color Change of the Surface of Steamed Maple Wood with Saturated Water Steam

Polymers ◽  
2022 ◽  
Vol 14 (1) ◽  
pp. 217
Author(s):  
Ladislav Dzurenda ◽  
Michal Dudiak ◽  
Eva Výbohová
Keyword(s):  
Uv Radiation ◽  
Color Change ◽  
Color Space ◽  
Color Stability ◽  
Color Difference ◽  
Saturated Steam ◽  
Water Steam ◽  
Saturated Water ◽  
Red Color ◽  
Uv Lamp

The wood of maple (Acer Pseudopatanus L.) was steamed with a saturated steam-air mixture at a temperature of t = 95 °C or saturated steam at t = 115 °C and t = 135 °C, in order to give a pale pink-brown, pale brown, and brown-red color. Subsequently, samples of unsteamed and steamed maple wood were irradiated with a UV lamp in a Xenotest Q-SUN Xe-3-H after drying, in order to test the color stability of steamed maple wood. The color change of the wood surface was evaluated by means of measured values on the coordinates of the color space CIE L* a* b*. The results show that the surface of unsteamed maple wood changes color markedly under the influence of UV radiation than the surface of steamed maple wood. The greater the darkening and browning color of the maple wood by steaming, the smaller the changes in the values at the coordinates L*, a*, b* of the steamed maple wood caused by UV radiation. The positive effect of steaming on UV resistance is evidenced by the decrease in the overall color difference ∆E*. While the value of the total color diffusion of unsteamed maple wood induced by UV radiation is ∆E* = 18.5, for maple wood steamed with a saturated steam-air mixture at temperature t = 95 °C the ∆E* decreases to 12.6, for steamed maple wood with saturated water steam with temperature t = 115 °C the ∆E* decreases to 10.4, and for saturated water steam with temperature t = 135 °C the ∆E* decreases to 7.2. Differential ATR-FTIR spectra declare the effect of UV radiation on unsteamed and steamed maple wood and confirm the higher color stability of steamed maple wood.

Changes in the content of chlorophylls and carotenoids in the rind of Fino 49 lemons during maturation and their relationship with parameters from the CIELAB color space

2019 ◽  
Vol 243 ◽  
pp. 252-260 ◽  
Author(s):  
A. Conesa ◽  
F.C. Manera ◽  
J.M. Brotons ◽  
J.C. Fernandez-Zapata ◽  
I. Simón ◽  
...  
Keyword(s):  
Color Space ◽  
Cielab Color Space ◽  
Cielab Color

Development of a customized whiteness index for dentistry based on CIELAB color space

2016 ◽  
Vol 32 (3) ◽  
pp. 461-467 ◽  
Author(s):  
María del Mar Pérez ◽  
Razvan Ghinea ◽  
María José Rivas ◽  
Ana Yebra ◽  
Ana María Ionescu ◽  
...  
Keyword(s):  
Color Space ◽  
Whiteness Index ◽  
Cielab Color Space ◽  
Cielab Color
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