Color Research and Application最新文献

There exists a general misunderstanding among colorists as to the units involved in the equation for tristimulus integration. The investigator of the color-matching functions chooses four cardinal stimuli which, along with his choice to cause the three primaries to have equal coloration power to each other, causes him to assign units to the color-matching functions in order that these units may be carried to the equation for tristimulus integration. This note discusses the development of these units using the 1931 RGB experiment and subsequent algebraic processing as an example. It develops exactly what these units are and concludes that they are consistent.

The concept of color space is ubiquitous in color science and technology and is applied to a wide variety of stimulus, signal, and perceptual dimensions. This Color Forum paper aims to discuss the concept of representing color in a multidimensional geometric space and whether such a concept is useful in helping us understand human color perception. The conclusion is that the concept of color space might not be of utility, but the hope is that this paper prompts further thoughts and review by others and motivates additional Color Forum papers that either provide examples of the utility of the color space concept or add further support to the idea that it might be time to look at color differently.

We have developed a system that separates and measures the optical properties of skin that determine its visual quality, that is, the surface reflection, diffuse reflection, and subsurface scattering components of the skin. This system includes two polarization filters that separate light from the skin into a surface reflection component image and a diffuse reflection component image. Furthermore, by using a projector as a light source and irradiating the skin using a high-frequency binary illumination pattern, the subsurface scattering component image alone can be separated and generated. Application of an algorithm that calculates the luminance value Y for each component image not only makes it possible to analyze each light signal from the skin quantitatively, but also enables understanding of how each light signal is related to the skin's overall appearance. Using the proposed system, we performed a survey of 154 Japanese women aged from their 20s to their 70s and analyzed age-related changes in the optical properties of their skin. The results revealed the following. First, the luminance value Y of the surface reflection from the cheek and its standard deviation within the analysis area increase with age. Second, the Y value of diffuse reflection from the skin decreases with age. Third, the amount of light in the subsurface scattering components also decreases with age. The proposed system is expected to be suitable for a wide range of applications, including color science, and various studies of the appearance of human skin.

The development of urban color planning and design has evolved alongside massive urbanization in China over the past two decades. In this field, Jianming Song has become one of the most profound practitioners, having carried out hundreds of urban color projects since the turn of the millennium. This study aims to answer the question: What can be learned from these projects to provide useful knowledge for future urban development? In response to the complexity of the urban context and the relationship between urban space and colorscape, Song utilizes linguistics-based design methodologies as an effective way to solve practical problems. This article articulates the application of linguistics in urban typology, color narratives, and the development of color themes. The study also identifies an integrated methodological framework that include the perspectives of ontology, epistemology and methodology. The research findings point to a renaissance of traditional culture implemented in contemporary design practice. Urban color planning and design is the product of local, social, economic, and political relations. The research encourages local knowledge combined with intellectual analysis to contribute to the design revolution in urban development.

The main goal of this article is to summarize and present the most important facts concerning the use of the blue color in the built environment, considering its symbolic, functional, and decorative aspects. This monograph of color is aimed to contribute to a better understanding and clarify the place and meaning of the blue color in the architectural space and allow architects to use this color with greater awareness of its characteristic features in the historical context. The results of the detailed analysis of more than 200 blue buildings, collected by the author since 2006, are grouped into seven main thematic sections, which express different ways of applying blue in the architectural space: as a symbol/idea, the color of the sky, as traditional, contrast, and material color, as a visual attribute and brand color, and last but not least as the color of the light. The main conclusion is that, although the rationales for using blue color in architecture were diverse, symbolic and aesthetic considerations prevailed. As the dominating color of the sky and water, blue is considered the most intangible of all hues in architecture. Also, as a worldwide attribute of divinity, connected with Heaven as the domicile of deities and gods, it has received a considerable spiritual load. The universality of this symbolism, combined with the high cost of pigments, has given the blue color its unique and exclusive value. Even nowadays, despite the greater availability of blue materials and colorants, blue has not become a prevalent color in architecture. On the contrary, its visual impact, both in glass curtain walls and in night illuminations, still emphasizes its immateriality and reference to spiritual symbolism.

Designers are often called upon to design therapeutic spaces that serve people who are in fragile emotional and/or physical states. While there is considerable guidance on designing for function in these spaces, the evidence-based guidance on aesthetics is virtually non-existent, especially when it comes to color. For a long time, the prevailing assumption in these studies, and among the public in general, has been that hues are the drivers of emotional content (e.g., red is exciting and blue is calming) and they have, for the most part, disregarded the distinct emotional connotations of light, dark, and muted versions of a hue. This oversight has led to unfortunate outcomes in the real world. The idea that blue is calming, for instance, has paved the way for brand new state-of-the-art facilities featuring light blue walls that occupants may read as cold and unwelcoming. Designers need a rational, evidence-based approach that helps them understand what many of them already know intuitively: spaces can be calm and inviting without being blue. After an overview of the design process, this article proposes that Pleasure-Arousal-Dominance (PAD) theory may aid designers to better understand that pale and dark (high and low value) colors convey opposites messages related to strength/power (dominance), and that vivid and muted colors (high and low chroma) convey opposite messages about energy/activity level (arousal). Finally, the author illustrates how this thought process might be applied in an architectural design practice.

3D printing has become a widespread technology that allows the creation of physical objects from different materials. The conservation and restoration of Cultural Heritage field has recently introduced this technology as a complement to its traditional methods. However, the main concern in the application of 3D printing in this context is the long-term behavior of the materials used. The key objective of this research was the identification of the suitability of 3D printing filaments for conservation purposes. The methodology followed in this study consisted of a selection of 13 3D printing filaments for Fused Deposition Modeling (FDM) technologies, which were tested and exposed to an accelerated aging procedure. In order to classify and recommend the materials that present better results, the properties of color, the glossiness, the pH and the Volatile Organic Compounds emission were investigated. This paper collects the results of the analyses carried out, focusing discussion on the colorimetric behavior. The results demonstrate the usefulness of some of the materials studied, highlighting the performance of EP as one of the most stable and reliable materials while Flex is one of the most changeable ones in the Cultural Heritage context. Even though this research provides an overview of the aging of the materials studied, further analyses should be performed to understand the chemical composition and its behavior when exposed to a long-lasting aging process.

This integrative review sought knowledge across a broad spectrum of literature concerning the role of color and light in maternity environments. Today it is acknowledged that the clinical nature of birth spaces is detrimental to maintaining normal physiological birth rates. Significantly, “clinical” spaces are often described as white, pale, monochromatic, and/or overlit. Attempts to make maternity settings more “home-like” have promoted use of “warm” or “soft” colors. Ambience or spatial atmosphere is known to impact birth hormones, affecting labor commencement and progress. Today, efforts to improve birth spaces include “sensory rooms” (offering pain distraction via dark spaces and illuminated color elements); programmable colored light installations; and immersive image projections. Yet, as this paper shows, there is little specific study of the physical and psychological impact of color and light within birth settings. However, there are significant findings on colored light's impact upon birth processes, including the contraindication of bright blue light. And there is valuable knowledge embedded in old and new literature from diverse disciplines. This review thus exposes the strong need for further research and literature focused directly on how color and light in birth environment design impact birth experience for all involved. It is clear that environmental color and light need to be taken seriously as potent interrelated environmental factors that are directly implicated in the health and wellness of mothers and their infants during labor and birth. Thus, it is crucial to bring deeper awareness and comprehensive knowledge into use by designers, developers and managers of birth spaces.

Color is a common design element in the built environment and is considered to have the capacity to elicit human response. In respect to environmental color interventions, outcomes tend to occur on a localized, microscale and relate to improving visual amenity, enhancing engagement and activation, and supporting initiatives relating to environmental visual literacy, wayfinding, orientation, and cultural diversity. Recently, a new type of color intervention has emerged. Relating to geopolitical issues of global concern, these occur on a “pop-up” basis, carry a sense of immediacy, and relate to specific issues on a broader, crosscultural, macro scale. Falling under the category of tactical urbanism and representing a new form of environmental color intervention, this article identifies and documents two such interventions, both of which feature color as an integral element. In doing so, a secondary aim was to discuss the likely intended outcomes of these interventions. Adopting a case study methodology in tandem with a grounded theory qualitative approach, this investigation represents insight into this new form of environmental color intervention. Outcomes indicate that these interventions focus on communicating information aimed at initiating change on a global, macro scale. Future research will indicate the extent to which these aims are met.

The paper describes a comprehensive test to evaluate the performance of current colour-difference models using available experimental datasets. In total, 28 individual datasets were accumulated to test 17 colour-difference formulae, 13 of them based on Uniform Colour Spaces (UCSs) in terms of the Standardized Residual Sum of Squares (STRESS) measure. The 28 datasets were divided into three groups: Large Colour-Difference data (LCD), Small Colour-Difference data for surface colours (SCDs), and Small Colour Difference data for display colours (SCDd). For each colour model, four versions were tested: the original model, and that including k_L-, Gamma- and k_L/Gamma, which are the lightness parametric factor, the colour-difference exponent factor, and the combination of both, respectively, optimized to fit particular dataset(s). The statistical F-test was applied to test the difference between each pair of models. Furthermore, parametric effects between the large/small colour-difference magnitudes, and between surface/display colours were investigated. The results showed that CAM16-UCS significantly outperformed the other models for all groups. It accurately predicted all types of data and should be proposed for colour-difference evaluation across all industries.