New Statistical Figures of Merit for Color Quality of Solid-State Lamps

Light causes damage when it is absorbed by sensitive artwork, such as oil paintings. However, light is needed to initiate vision and display artwork. The dilemma between visibility and damage, coupled with the inverse relationship between color quality and energy efficiency, poses a challenge for curators, conservators, and lighting designers in identifying optimal light sources. Multi-primary LEDs can provide great flexibility in terms of color quality, damage reduction, and energy efficiency for artwork illumination. However, there are no established metrics that quantify the output variability or highlight the trade-offs between different metrics. Here, various metrics related to museum lighting (damage, the color quality of paintings, illuminance, luminous efficacy of radiation) are analyzed using a voxelated 3-D volume. The continuous data in each dimension of the 3-D volume are converted to discrete data by identifying a significant minimum value (unit voxel). Resulting discretized 3-D volumes display the trade-offs between selected measures. It is possible to quantify the volume of the graph by summing unique voxels, which enables comparison of the performance of different light sources. The proposed representation model can be used for individual pigments or paintings with numerous pigments. The proposed method can be the foundation of a damage appearance model (DAM).

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Effect of oxygen scavenging films and modified atmosphere on the color quality of hot‐filled freestone peach puree

Journal of Food Process Engineering ◽

10.1111/jfpe.13681 ◽

2021 ◽

Author(s):

Steven Skrypec ◽

Hansol Doh ◽

William Scott Whiteside

Keyword(s):

Modified Atmosphere ◽

Oxygen Scavenging ◽

Color Quality ◽

Effect Of Oxygen

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Effects of Process Parameters on the Color Quality of Anthocyanin-Based Colorants from Conventional and Microwave-Assisted Aqueous Extraction of Sweet Potato (Ipomoea batatas L.) Leaf Varieties

Proceedings ◽

10.3390/foods_2020-07741 ◽

2020 ◽

Vol 70 (1) ◽

pp. 103

Author(s):

Jin Mark D. G. Pagulayan ◽

Aprille Suzette V. Mendoza ◽

Fredelyn S. Gascon ◽

Jan Carlo C. Aningat ◽

Abigail S. Rustia ◽

...

Keyword(s):

Sweet Potato ◽

Process Parameters ◽

Ipomoea Batatas ◽

Extraction Methods ◽

Aqueous Extraction ◽

Potato Leaf ◽

Microwave Assisted ◽

Color Quality ◽

The Impact

The study aimed to evaluate the effects of process parameters (time and raw material weight (RMW)) of conventional (boiling for 10–45 min) and microwave-assisted (2–8 min) aqueous extraction on the color quality (i.e., lightness (L*), chroma (C*), and hue (H°) of anthocyanin –based colorants of red and Inubi sweet potato (Ipomoea batatas L.) leaves. Using response surface methodology, it was found that RMW and boiling time (BT) and microwave time (MT) generally had a significant (p < 0.05) effect on the color quality of the extract from both extraction methods. The effects were found to vary depending on the extraction method and variety of the leaves used. Both extraction methods produced a brown to brick-red extract from the Inubi variety that turned red-violet to pink when acidified. The red sweet potato leaves produced a deep violet colored extract that also turned red-violet when acidified. It is recommended that the anthocyanin content of the extracts be measured to validate the impact of the methods on the active agent. Nevertheless, the outcomes in this study may serve as baseline data for further studies on the potential of sweet potato leaf colorants (SPLC) as a colorant with functional properties.

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Development of a three-dimensional color rendition space for tunable solid-state light sources

Color and Imaging Conference ◽

10.2352/issn.2169-2629.2021.29.136 ◽

2021 ◽

Vol 2021 (29) ◽

pp. 136-140

Author(s):

Dorukalp Durmus

Keyword(s):

Solid State ◽

Dimensional Space ◽

Three Dimensional ◽

Color Discrimination ◽

Continuous Measure ◽

Light Sources ◽

Vast Number ◽

Lighting Systems ◽

Single Number

The quality of building electric lighting systems can be assessed using color rendition metrics. However, color rendition metrics are limited in quantifying tunable solid-state light sources, since tunable lighting systems can generate a vast number of different white light spectra, providing flexibility in terms of color quality and energy efficiency. Previous research suggests that color rendition is multi-dimensional in nature, and it cannot be simplified to a single number. Color shifts under a test light source in comparison to a reference illuminant, changes in color gamut, and color discrimination are important dimensions of the quality of electric light sources, which are not captured by a single-numbered metric. To address the challenges in color rendition characterization of modern solid-state light sources, the development of a multi-dimensional color rendition space is proposed. The proposed continuous measure can quantify the change in color rendition ability of tunable solid-state light devices with caveats. Future work, discretization of the continuous color rendition space, will be carried out to address the shortcomings of a continuous three-dimensional space.

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