CIE 2017 color fidelity index Rf: a better index to predict perceived color difference?

Jost, Sophie; Cauwerts, Coralie; Avouac, Pascale

doi:10.1364/josaa.35.00b202

Cited by 42 publications

(29 citation statements)

References 27 publications

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“…Studies on skin color observations outside of China tend to be more non-invasive ( 22 , 23 ). The measurement results are typically expressed according to the CIE L*a*b color system ( 13 ). The L value is positively associated with the levels of melanin in the skin and hemoglobin in the dermis.…”

Section: Discussionmentioning

confidence: 99%

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Inhibitory effect of timolol on topical glucocorticoid‑induced skin telangiectasia

Chen

Lei

2018

Mol Med Report

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The aim of the present study wasto investigate the potential inhibitory effect of timolol on topical glucocorticoid-induced skin telangiectasia. In rabbits, flumethasone ointment was used to induce skin telangiectasia in the inner ear. Subsequently, timolol maleate (0.5%) eye drops (TMEDs) were administered twice daily for 4 weeks. Expression of the antibacterial peptides 37-amino acid peptide (LL-37) and kallikrein-5 (KLK5) was detected using quantitative polymerase chain reaction (PCR) and semi-quantitative reverse transcription-PCR. In patients with facial skin telangiectasia, one cheek of each patient was assigned to a treatment group and the other to a control group. For the treatment group cheeks, topical application of TMEDs was combined with 0.1% tacrolimus ointment once or twice daily for 8 weeks. The control group cheeks were administered with 0.1% tacrolimus ointment alone. Alterations in lesions were recorded by dermoscopy, and the L, a and b values of lesions were measured, based on the Commission Internationale de l'Éclairage system, with a chromameter prior to and at 1, 2, 4 and 8 weeks following treatment. The results indicated that erythema, papules and telangiectasia were significantly diminished following 4 weeks of treatment with TMEDs in rabbits. Notably, the expression of LL-37 and KLK5 mRNA was increased in the negative control group; however, it was decreased in the trial and blank groups. Clinical and dermoscopy images demonstrated that erythema was reduced in the 2 groups for 1 week, and that telangiectasia in the treatment group was markedly reduced compared with the control group at 4 weeks. The difference of the L and a values of lesions between the treatment and control group was significant (P<0.05). Overall, the present results suggested that the abnormal expression of LL-37 may be one of the mechanisms underlying the pathogenesis of facial corticosteroid addiction dermatitis (FCAD) and TMEDs may inhibit the mRNA expression of LL-37 by downregulating KLK5; in this regard, TMEDs may serve a role in attenuating telangiectasia, which may be beneficial in improving the telangiectasia symptoms of FCAD.

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Section: Discussionmentioning

confidence: 99%

“…Simultaneously, the color of lesions was measured with a chroma meter. Values of L, a and b, based on the Commission Internationale de l'Éclairage (CIE) system ( 13 ), were measured 3 times and the mean values were calculated. The L value represents the balance from white to black, with pure black being 0 and pure white being 100.…”

Section: Methodsmentioning

confidence: 99%

Inhibitory effect of timolol on topical glucocorticoid‑induced skin telangiectasia

Chen

Lei

2018

Mol Med Report

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“…Phosphor-converted white light-emitting diodes (WLEDs) are a promising light source because of their small size, high energy efficiency, low cost, and color stability [1][2][3][4]. WLEDs apply the principle of complementary colors: Blue light from a blue chip is combined with yellow light from phosphor [5]. WLEDs have the potential to be used in solid-state lighting, but their luminous efficiency must be enhanced [6,7].…”

Section: Introductionmentioning

confidence: 99%

Improving color quality and luminous flux of white LED utilizing triple-layer remote phosphor structure

Loan

Anh

2020

IJECE

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In this manuscript, we presented a research that enhance the performance of WLED using the multi-phosphor configuration. The phosphor layers in the research are separated from each other to achieved better luminous efficiency, however, it makes controlling color light quality more complex. Another issue is finding out the whether two layers of phosphor or three layers of phosphor is better in improving color quality. The research addressed this issue by analyzing the optical aspects of the respective WLEDs that employ these structure. The studied aspects are quality indicators such as luminous efficacy (LE), and color uniformity, color rendering index (CRI), color quality scale (CQS). The results of the experiments in this research, which come from the employment of WLEDs with 2 color temperatures 5600 K and 8500, suggest that WLED with three phosphor layers is better in CRI, CQS, LE. This type of phosphor structure also limits the color deviation significantly, thus, improves the color uniformity. This results is verifies with Mie theory, therefore, can be applied as reference or guideline for production of better WLEDs

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“…Another notable solution is apply hemispherical shell made from polymer with phosphor interior can allow the extracted radiation to excel [16][17][18]. Moreover, a structure with gaps implanted at the base can support radiant profiency by reflecting light that emitted downward [19,20]. Notwithstanding the structure of the bundle, the grouping of phosphor yield positive results on lighting capacity of the device.…”

Section: Introductionmentioning

confidence: 99%

Na3Ce(PO4)2:Tb3+ and Na(Mg2–xMnX)LiSi4O10F2:Mn phosphors: a suitable selection for enhancing color quality and luminous flux of remote white light-emitting diodes

Loan

Anh

2020

TELKOMNIKA

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This study proposed the TRP, a remote phosphor structure that has 3 phosphor layers, to ehance the chromatic quality and lumen output for white light-emitting diodes devices (WLEDs). The arrangment of phosphor layers is yellow YAG:Ce 3+ phosphor, green Na3Ce(PO4)2:Tb 3+ phosphor, and red Na(Mg2-xMnX)LiSi4O10F2:Mn phosphor from bottom to top. Red Na(Mg2-xMnX)LiSi4O10F2:Mn phosphor is used for the red light component to boost color rendering index (CRI). The green layer Na3Ce(PO4)2:Tb 3+ phosphor is utilized for the green light component to produce higher luminous flux (LF). With the addition of red and green phosphor, the yellow YAG:Ce 3+ concentration must decrease to maintain the 6000 K color temperature. The research results show that red phosphor Na(Mg2-xMnX)LiSi4O10F2:Mn concentration is beneficial for CRI, while green phosphor Na3Ce(PO4)2:Tb 3+ is detrimental to CRI. Morever, CQS reaction with red and green phosphor is also studied, which show notable improvement when Na(Mg2-xMnX)LiSi4O10F2:Mn concentration is from 10-14%, regardless of Na3Ce(PO4)2:Tb 3+. The luminous flux (LF) can also increase for more than 40% with the reduced light loss and added green phosphor. Research results are valuable references for producers to enhance the color quality and the light emission of WLEDs.

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CIE 2017 color fidelity index Rf: a better index to predict perceived color difference?

Cited by 42 publications

References 27 publications

Inhibitory effect of timolol on topical glucocorticoid‑induced skin telangiectasia

Inhibitory effect of timolol on topical glucocorticoid‑induced skin telangiectasia

Improving color quality and luminous flux of white LED utilizing triple-layer remote phosphor structure

Na3Ce(PO4)2:Tb3+ and Na(Mg2–xMnX)LiSi4O10F2:Mn phosphors: a suitable selection for enhancing color quality and luminous flux of remote white light-emitting diodes

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