The transmission of color experience has become a central concern in the development of devices for blind and visually impaired individuals. Several techniques have been implemented, taking into consideration other sensory modalities, in an attempt to find the most suitable solution to intersemiotically translate this visual information. The primary objective of this paper is to investigate various approaches to convey chromatic information for individuals with low vision or blindness and emphasize the importance of multi-modal integration and cross-modal interaction among different senses. This research brings together a wide variety of strategies utilized to translate color codes, such as patterns, temperatures, scents, music, and vibrations, with the aim of uncovering the advantages and disadvantages of each technique. A review of the existing literature suggests that interaction between multiple sensory channels is more effective in compensating for lack of vision. As a particularly relevant case study, attention will be paid to the enjoyment of art by people with visual impairments.
This study was part of a doctoral research project which looked into the current issues with color education, documented by several authors in recent years. It presents a comprehensive analysis of 103 color courses taught within design programs of higher education institutions from different countries over the last 12 years, 2010–2022. The analysis aimed to define the state-of-the-art of including color training within higher education design programs, identify the main didactic strategies implemented, and recognize the main critical aspects to face when proposing an innovative framework for color training. Among the formal aspects analyzed are the course level, the course duration, the student entry profile, the specific disciplinary area, the course location, the type of institution, and the language of the course. The didactic strategy elements analyzed were the learning outcomes, the contents proposed by the course, the teaching strategies implemented, and the suggested bibliography. Finally, a description of the main findings of the analysis is provided to assess how color is being taught within the design area.
In order to enhance the accuracy and efficiency of color difference detection for dyed fabrics, this article introduces a novel superpixel-based color difference detection algorithm, which exhibits three significant improvements over the previous algorithm. First, it proposes a more rational color feature extraction method to extract more detailed color features from fabric images, which uses superpixels as basic units for both color feature extraction and color difference detection. Second, the algorithm employs the CIEDE2000 color difference formula to calculate color difference values. This eliminates the need for obtaining standard fabric images as references in advance, making the process more convenient and practical. Finally, an area-based color difference calculation method is proposed based on the human visual mechanism, ensuring that the evaluation results are more consistent with human eye observations. Experimental results demonstrate that the proposed algorithm provides more accurate and visually consistent color difference assessments compared to the previous algorithm.
Clinicians, occupational health personnel, and educationalists need to make an appropriate choice of color vision screening test or tests when screening for color vision deficiency (CVD). Four color vision screening tests were assessed on the same sample of subjects against the anomaloscope as a reference, enabling direct comparison of these tests. Two of the tests are available in revised form, one has received little attention for inherited CVDs.
The objective of this study was to examine three new or revised color vision screening tests, together with the Ishihara, on their (1) sensitivity, (2) specificity, and (3) ability to provide a tentative assessment of severity and of differentiation between protanomaly and deuteranomaly deficiencies.
Data from 104 color deficient and 38 color normal subjects were analyzed. The Hardy–Rand–Rittler (4th edition), City University (3rd edition), Ishihara (2005), and Mollon–Reffin tests were evaluated against the Oculus Heidelberg multi-color anomaloscope. All screening tests were performed before anomaloscopy.
Sensitivity was comparable for the Ishihara, Hardy–Rand–Rittler, and City University tests (Chi-square = 3.26, df = 2, p > 0.05), whereas the Mollon–Reffin had best specificity (100% using a threshold value of two). Compared with all other screening tests the Hardy–Rand–Rittler was the best at correctly classifying a deficiency: protanomaly (75%) and deuteranomaly (82%). While the Ishihara was good at detecting deutans (100%), it misclassified 100% of protans as being deutan. Finally, the Hardy–Rand–Rittler was the only screening test to successfully separate mild from medium severity of deficiency.
Selection of screening test is dependent on the intended outcome of screening. Referral for more definitive CVD assessment is the preferred option.
Automatic analysis of images is increasingly being used to generate color insights and this has led to various methods for generating palettes. Several studies have recently been published that explore methods to predict the visual similarity between pairs of palettes and these methods are often used to evaluate different generative methods. This work is concerned with being able to predict visual similarity between color palettes. Three data sets (two of which were previously published) are used to evaluate two methods for predicting visual similarity between palettes. A novel palette-difference metric (based on the Hungarian algorithm) is compared to the previously published minimum color difference model (MICD) and was found to agree better with the visual data for two of the three data sets. Agreement between models and visual data was also better for CIEDE2000 (1, 2) than for CIELAB metrics.
Measuring color matching differences between observers is an important means of investigating individual differences in human color vision. In this article, we introduce a new LED-based visual trichromator with which we have estimated color matching functions and cone spectral sensitivities in a group of five normal observers. The trichromator has side-by-side semi-circular matching fields that are illuminated by two spectrally tunable LED light sources, each comprised of 18 LEDs with center wavelengths ranging from 400 to 700 nm. We used Maxwell's method to derive a set color match. A fixed triplet of red-green-blue (RGB) primaries produced the white standard field of 120 cd/m2 in one field. The other field, the mixture field, was illuminated by one of 11 different triplets of lights with various center wavelengths. Observers adjusted the intensities of the triplets in the mixture field to match the white standard field. All matches were made for field diameters of 2° and 10° of visual angle to allow comparisons with colorimetric standards and were repeated five times. Calibrations and tests showed that the trichromator and the measurements were stable and repeatable. Grassmann's laws predict that at the 11 color matches the excitations in the three cone types should be the same. Consequently, we can use those matches and a model of how cone spectral sensitivities vary between individuals to estimate the three underlying corneal cone spectral sensitivities for each observer (and thus how they vary from the standard (or mean) observer). We find good agreement with the CIE 2006 standards, but our observers show small but consistent differences.
Streets and buildings that become inactive within the historical texture of cities can be restored to the district through rehabilitation projects and color designs, which encourage urbanites to use them more actively. Such spaces are especially important for urban memory, yet they risk losing their integrity over time due to uncontrolled development. Therefore, making them available for urban use is important for socio-cultural and economic development. This study involves the application, under a rehabilitation project, of a holistic approach to façade color design for buildings located on two streets in the center of Adana, a city in southern Turkey that dates back to the Common Era. The study began with collecting color samples from the area as part of environmental color analyses, after which the colors of the samples were measured. In line with the environmental characteristics that affect color perception, a range of colors with Munsell's equivalent value and hue contrast was considered appropriate for application to the facades of buildings in the Kayalıbağ neighborhood. In the color design, five different hues with high-value (light) and low chroma were selected to increase the attractiveness of the historically and archeologically highly significant district. The aim of the color design was to increase the livability and attractiveness of the district, while not overshadowing the cultural qualities of the urban environment.
Color blindness (color vision deficiency) affects ~8% of males and ~ 0.4% females worldwide. Here we use the elicited lists method to investigate their semantic knowledge regarding “basic color terms” and their relationships. Lists were obtained from color vision deficient and normal observers. 32 dichromats (15 protanopes, 17 deuteranopes) and 32 normal trichromats (17 females, 15 males) diagnosed by a battery of color tests (Ishihara, City University Test, anomaloscope) wrote monolexemic lists of colors. Psychological salience of terms (ln(CSI)), adjacency between pairs of terms (ADJ; MDS) and the presence of clusters of terms defined on the basis of the Universals and evolution hypothesis were analyzed. All four groups of participants showed the same semantic memory structure: lists started with the cardinal primaries cluster (blue, red, yellow, green), followed by the achromatic primaries cluster (black and white), or the derived cluster (brown, orange, violet, pink, purple, and gray). After the clusters (cardinals, achromatics, and derived), a highly variable number of non-basic terms appeared. This number was higher in normal trichromats. Non-basic terms were not part of any cognitive cluster. The similarity in the lists of trichromats and dichromats suggest that both may acquire similar semantic knowledge about color terms. Several potential explanations are considered.
Color degradation is a pressing issue in various fields like food and medicine packaging, as well as printed materials, leading to a loss or distortion of vital information. Therefore, understanding how the color of package prints evolves over time is essential for product quality assessment and effective product life cycle management. This study focuses on investigating color changes in prints on blister foils, widely used in the medicine and packaging industries. To assess fading characteristics, samples printed via the gravure process have been exposed to a Xenon Test Chamber (B-SUN). Spectrophotometric measurements of the prints have been conducted using a spectroradiometer, and the data have been analyzed using principal component analysis (PCA). The fading nature of cyan and black prints aligns with Type IV, while magenta and yellow prints correspond to Type II, as described by Giles. Notably, cyan and black inks demonstrated resistance toward fading at the end of the exposure, with a minor exception. The investigation involved curve fitting, revealing a consistent first-order kinetic model governing fading rates throughout the exposure time. High R2 values (0.96–0.99) and low root means square error values (0.02–0.08) are observed across all cases. While color fading involves diverse kinetics, the fading rate consistently adheres to a singular first-order kinetic path. The study highlights that yellow ink is most sensitive to light, followed by magenta ink. These findings offer valuable insights for optimizing packaging materials and ensuring product quality in industries reliant on printed materials. By mitigating color degradation, manufacturers can enhance the longevity and appeal of their products, reinforcing consumer trust and satisfaction. Furthermore, the effective utilization of PCA as a data analysis tool offers a valuable approach for future investigations in color science and related fields.
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