Color Matching Research Articles

The application of printmaking art elements in visual communication design

Abstract Visual communication design and printmaking art are two independent art disciplines, but they have many similarities in graphic design, color matching and other aspects. This paper demonstrates the extraction of printmaking features using the improved LBP algorithm. The method of color histogram and color space is used to complete the color extraction of the image, and the texture features of the image are described by combining signal processing and statistical analysis. The LBP algorithm is used to locate the center pixel of the image to form a binary bit string, and the pattern value is obtained by multiplying each binary bit by the corresponding weight and summing up. The efficiency of image texture acquisition is enhanced by adding neighborhood gradient multiscale to the LBP algorithm. To obtain printmaking art elements and propose a direction for integration with visual communication design, image feature extraction is applied to printmaking art element extraction. The performance of texture classification for images has been significantly improved by the improved LBP algorithm, as shown in the results. On the Outextc10 texture dataset, DLBP5 achieves the highest classification accuracy of 92.19% by extracting colors, textures and shapes in printmaking and applying the features with elements of printmaking to visual communication design. Under the direction of integrating printmaking art style elements with visual communication design, users selected {unique, packaging design}, {vivid, branding design}, and {sharp, advertisement design} with higher satisfaction gradients, with ratings of 4.62, 4.17, and 4.36, respectively, which are all greater than 4.

An AIGC-empowered methodology to product color matching design

With the emergence of various generative AI applications, artificial intelligence-generated content (AIGC) demonstrates positive potential for design activities. However, few scholars have proposed a practical AIGC-based design methodology. This paper introduces an AIGC-empowered methodology for product color-matching design. ChatGPT generates target imageries describing the design features, and Midjourney constructs a shape sample database based on these imageries, identifying representative shapes through consumer perceptual questionnaires. Meanwhile, three Midjourney-based color image generation methods are proposed to generate color images that match the target imageries, and an application is developed to extract the dominant colors from these images. Finally, based on the color harmony theory, the optimal color combinations are derived from the extracted dominant colors and applied to the representative shape to generate color-matching alternatives. AHP-based expert evaluation (Evaluation_1) and consumer perceptual evaluation (Evaluation_2) are employed to ascertain the optimal design solution. This paper uses the household vacuum cleaner as an example to demonstrate the proposed color-matching methodology. Consistent evaluation results are obtained, supported by a significant Pearson correlation coefficient. Research findings suggest that AIGC has the potential to revolutionize traditional product color-matching design. Additionally, the methodology highlights the collaborative potential between generative AIs and conventional computer-aided design tools.

Rehabilitation of an ocular defect with custom ocular prosthesis- A case report

This abstract introduces a custom ocular prosthesis crafted from tooth-colored acrylic. This innovative prosthesis offers a natural and aesthetically pleasing solution for individuals with ocular defects. The tooth-colored acrylic material seamlessly blends with surrounding tissues, enhancing both cosmetic appearance and comfort. The fabrication process employs advanced techniques to ensure a personalized fit and accurate color matching. The prosthesis not only restores visual symmetry but also boosts the individual's self-esteem and overall quality of life. By addressing cosmetic and functional concerns, this advancement in ocular prosthetics holds the potential to significantly improve the quality of life for those in need of such interventions.

Novel Halochromic Disazo Stilbene Dye with Intramolecular Color Mixing Effect for Textile Sensor Material

A stilbene-based halochromic dye was synthesized, which possesses the effect of intramolecular color matching. By dyeing cotton fabric with the synthesized dye, a textile sensor material was prepared to visually monitor the acidity of the biologically significant pH range (4.5–8.0). The sensitivity of the sensor material to changes in the acidity of the environment, as well as the color stability to the action of saline solutions simulating biological fluids (sweat and blood plasma), were explored. A visually noticeable pH-induced color change of the material is observed in the pH range of 3.0–10.0. In the pH range of buffer solutions at pH 3, the color of the samples is green, from 6 to 8, orange, and from 9 and above, purple. The average color change time was 3 s. The results obtained show the promise of using the studied azo compound in technologies for designing multifunctional pH-sensitive textile sensor materials.

Gradated silicone shade guide utilized for shade matching extraoral prostheses.

Shade matching of extraoral prostheses is completed by mixing pigments and rayon flocking into medical-grade silicone and using a carrier to evaluate the color match. This process does not account for how material thickness affects the appearance of the silicone. This clinical case report discusses an innovative way to match the patient's skin tone using a digitally designed gradated silicone carrier and how this device allows for the assessment of shade from the thin marginal edge to 5mm thickness.

Cognitively Congruent Color Palettes for Mapping Spatial Emotional Data. Matching Colors to Emotions.

Emotions are touchstones of humans’ everyday life experiences. Maps of emotions inform a variety of research from urban planning and disaster response to marketing studies. Emotions are most often shown on maps with colors. Previous research suggests that humans have subjective associations between colors and emotions that impact objective task performance. Thus, a mismatch between the emotion associated with a color and the emotion it represents may bias the viewer’s attention, perception, and understanding of the map. There are no guidelines that can help cartographers and designers choose matching colors to display spatial emotional data. This study aimed to address this gap by suggesting cognitively congruent color palettes—color sets matched to emotions in a way that is aligned with color-emotion associations. To obtain the set of candidate congruent colors and identify appropriate color-to-emotion assignments, two user experiments were conducted with participants in the United States. In the first, participants picked a representative color for 23 discrete emotions. In the second experiment, for each candidate color from a set derived from the results of the first experiment, participants selected the best-matching emotions. The probability of the emotion being selected served as a measure of how representative the color is of that emotion. Due to the many-to-many nature of associations between colors and emotions, suitable color choices were incorporated into a dynamic palette generation tool. This tool solves the color assignment problem and produces a suitable color palette depending on the combination of selected emotions.

A Machine Learning Approach Investigating Consumers' Familiarity with and Involvement in the Just Noticeable Color Difference and Cured Color Characterization Scale.

The aim of this study was to elucidate the relations between the visual color perception and the instrumental color of dry-cured ham, with a specific focus on determining the Just Noticeable Color Difference (JNCD). Additionally, we studied the influence of consumer involvement and familiarity on color-related associations and JNCD. Slices of ham were examined to determine their instrumental color and photos were taken. Consumers were surveyed about color scoring and matching of the pictures; they were also asked about their involvement in food, familiarity with cured ham, and sociodemographic characteristics. Consumers were clustered according to their level of involvement and the JNCD was calculated for the clusters. An interpretable machine learning algorithm was used to relate the visual appraisal to the instrumental color. A JNCD of ΔEab* = 6.2 was established, although it was lower for younger people. ΔEab* was also influenced by the involvement of consumers. The machine-learning algorithm results were better than those obtained via multiple linear regressions when consumers' psychographic characteristics were included. The most important color variables of the algorithm were L* and hab. The findings of this research underscore the impact of consumers' involvement and familiarity with dry-cured ham on their perception of color.

Split-thickness Plantar Skin Graft for Foot Syndactyly.

For the treatment of syndactyly, the submalleolar or inguinal area is the common donor site for skin grafts. However, high skin tension of the submalleolar area could potentially delay wound healing or cause scarring. Skin grafts from the inguinal area cause pigmentation. In this study, we have harvested split-thickness skin grafts from the plantar area to treat syndactyly and evaluated the healing course and aesthetic outcome. We analyzed 13 recipient and nine donor sites in eight patients, aged 13-68 months (average 25 months), with syndactyly of the foot. The minimum follow-up was 14 months, and average follow-up period was 22.3 months. Aesthetic outcomes including color and texture match, wound healing of donor site using Vancouver Scar Scale, and complications of both sites were assessed in all patients. At the recipient sites, the graft survived well, and the lack of pigmentation of the graft led to good color match. At the donor sites, hypertrophic scar and high scar scale were seen around postoperative month 3, but were momentary, as all donor sites matured to a flat and soft scar. Morbidity of split-thickness skin graft from the plantar region is limited. It causes minimum scarring of the nonexposed area. Moreover, because it does not cause pigmentation, the split-thickness skin graft technique is a reasonable option for the treatment of syndactyly.

A new non‐verbal was developed to differentiate dementia and non‐dementia people and the study was to evaluate its validation

AbstractBackgroundDementia, which presents as cognitive decline in one or more cognitive domains affecting function, is increasing globally. Early diagnosis of dementia for general population is important, which needs a screening tool capable of identifying dementia efficiently.Most cognitive tests for screening dementia are based on verbal administration, which will be influenced by cultural background and language differences, if any.Developing a screening tool less depended on verbal administration is crucial for these necessities.MethodParticipants aged from 50 to 89 years old were recruited from department of Neurology, Kaohsiung Municipal Ta‐Tung Hospital, Taiwan. Dementia was diagnosed based on clinical diagnosis with referring to cognitive test performance by psychologists by 2011 National Institute on Aging and Alzheimer’s Association (NIA‐AA) criteria for all‐cause dementia .Participants were assessed with Clinical dementia rating (CDR), Cognitive Abilities Screening Instrument (CASI), derived Mini‐Mental State Examination (MMSE) and the non‐verbal cognitive test consisted of visual memory test, digital connection test, clock puzzle, shape color matching and simple card sorting test. These tests were designed to capture cognitive function including visual memory, visuospatial ability, and executive function. Statistical analysis was performed using MedCalc, version 20.14.ResultIn total, 160 demented patients and 81 non‐demented participants were recruited. The performance of the dementia group was worse than that of the control group in all non‐verbal tests. Among these tests, visual memory had the greatest ability to examine dementia with its percentage of recalled visual memory with optimal cut‐off point 70% having a sensitivity 73.38%,specificity 85.19% and area under the curve (AUC) as 0.87. Combining visual memory test, the digital connection test‐1 and the clock puzzle‐1 to discriminate dementia, the AUC was 0.93 and was superior to the AUC of MMSE (AUC = 0.88).ConclusionCompared to traditional pencil‐paper tests, non‐verbal tests shown its potentials in screening dementia with fewer language limitation.

Evaluation of shade correspondence between high-translucency pre-colored zirconia and shade tab by considering the influence of cement shade and substrate materials

Statement of problemThe relation between cement color and abutment substrate material and the corresponding effect on the color accuracy of high-transparency pre-colored zirconia (HT-Zr) remains unclear. PurposeThis in-vitro study aimed to investigate the difference in color accuracy when the HT-Zr is bonded to different materials-based substrates with differently colored resin cement. Materials and methodsVita A1 shade HT-Zr with 1 mm thickness was used as the testing sample. The samples were first placed on zirconia (ZR), tooth color resin (CR), and metallic (MT) abutment substrates. Subsequently, four differently colored cements (translucent (TR), bleach, opaque, and A2 shade (A2)) were used for bonding HT-Zr onto the substrate, and the non-bonded group was used as the control group (CG). There were 15 groups in total (n = 10 per group). A digital colorimeter was used to obtain Commission Internationale de l’Eclairage (CIELab) color parameters. The translucency parameter (TP00) of the substrate and sample, as well as color difference (ΔE00) and chroma (C) between the different groups were calculated. Additionally, the ΔE00 and TP00 were compared with the moderately unacceptable match of ΔE00 = 3.6. The statistical analysis was conducted using ANOVA and Tukey HSD post-hoc test (α = 0.05). ResultsHT-Zr exhibited high translucency (TP00 = 11.02 ± 0.18), and the mean ΔE00 of the testing samples ranged between 2.18 ± 0.20 and 13.14 ± 0.31. The ZR-CG and MT-A2 groups showed the highest and lowest lightness separately. The CR-CG group exhibited the highest C, and the ΔE00 was lower than that of 3.6. The MT-TR group showed the lowest C and the highest ΔE00. The inter-group comparison revealed that the ΔE00 for different cement is mostly lower than the acceptable color match of 1.0; moreover, the ΔE00 for all the substrates, excluding the CG group, is higher than 3.6. ConclusionsThe abutment substrate materials and the cement color should be considered with caution when using HT-Zr, with the effect of abutment substrate materials being more apparent in color accuracy. HT-Zr restorations are not recommended for discolored or bleached abutments but only for natural-colored abutments to achieve the optimal color appearance.

Non‐allelic recombination interactive genetic algorithms for colour imagery reproduction in colour scheming

AbstractUsing image extracted colours as the colour source for product colour matching is a common design strategy. The process of colour scheme design involves both source colour combination optimisation and continuous variable optimisation. As a commonly used optimising tool, interactive genetic algorithm (IGA) recombines the colours between alleles, that is, the same area in different colour schemes. Two types of invalid schemes are prone to arise during optimisation. The first is the colour duplication in a colour scheme's areas, which are supposed to be painted differently. The second is the unexpected new colours generated through interpolation between alleles. This article proposes a non‐allelic IGA (NA‐IGA) method, which allows colour recombination among non‐alleles, to avoid invalid schemes and improve algorithm efficiency. The crossover, evaluation, and selection operators are redesigned. NA‐IGA tries to maintain the features of extracted colours in the colour schemes while taking user preference into consideration. Thus, interaction methods for colour matching optimisation are designed to extend the evaluation mode of traditional IGA, including colour shuffling, continuous fine‐tuning, and so forth. An application test is conducted in the rail vehicle's painting design. The comparison experiment with traditional IGA shows that NA‐IGA significantly reduces the generation of invalid schemes and significantly improves efficiency and effectiveness of the optimisation.

A preliminary study on the dynamics of serum color in perspective to hemoglobin and bilirubin in indigenous sheep of Pakistan.

The present study is the first of its kind being reported for an indigenous sheep breed of Pakistan with objectives to (a) assess the diagnostic efficacy of a human-based "serum hemolysis reference palette" for sheep serum, (b) deduce normal reference intervals (RIs) for hemoglobin (Hb) and bilirubin, and (c) devise a novel serum color chart for on-field estimation of Hb and bilirubin through color matching of sheep serum. Apparently, healthy Sipli sheep (n = 130) were bled twice attaining whole blood and serum samples (n = 260). The study animals were grouped on the basis of gender,that is, males (n = 51) and females (n = 79) and age,that is, G1 (up till 1 year) (n = 41), G2 (from 1 to 2 years) (n = 46), and G3 (from 2 to 3 years) (n = 43). None of the 260 serum samples of the sheep matched the color given on the human-based "hemolysis reference palette." The G1 animals revealed marked variation in their serum color. Hence, on the basis of RIs, the serum samples (n = 178) of adult sheep (G2 and G3) showing three main color bands were used in devising a novel serum Hb and bilirubin estimation chart for adult sheep serum. In conclusion, the human-based serum hemolysis palette is not valid for sheep serum. The RIs attained in the study could provide a yardstick for assessment of health in indigenous sheep breeds whereas the serum color chart may be of value in estimating Hb and bilirubin in a quick, reliable, and cheaper way for the resource-poor settings of the world.

Color match analysis of single-shade and multi-shade composite resins using spectrophotometric and visual methods after bleaching.

The aim of this study is to evaluate the color match of the materials after the staining and bleaching procedures applied to the teeth restored with single-shade and multi-shade composite resins. Cavities prepared on the facial surface of human incisors were restored with two different composite resins. After 24 h, the color matching parameters between the initial filling-tooth of the samples were recorded. Then, the color measurements of the samples subjected to the coloring process were repeated. Each composite resin group was randomly divided into 2 subgroups and home and office bleaching methods were applied to the samples. After bleaching, color measurements were repeated. In terms of periods, a statistically significant difference was found in ΔE values 1 day and 28 days after bleaching (p<0.05). In addition, it was found that the color match between filling-tooth was generally weaker in Omnichroma material and after home bleaching.

Design and testing of a device for the characterization of gas transfer through soap films and measurement protocol based on color matching

Soap films are interesting for their potential utilization as soft, self-assembled, self-healing and possibly recyclable membranes. The intrinsic possibility of tuning their properties, such as e.g. surface and bulk elasticity or permeability, via tailored chemistry makes them flexible enough for a wide range of physical-chemical applications. Here we introduce a novel device that can serve as a research platform for the detailed experimental characterization of the soap film permeability to gases. The design and manufacturing of the novel platform are discussed, along with a sample characterization protocol based on a color-matching procedure for dioxygen diffusion through typical soap films. The experimental data is compared with the results obtained from a numerical model, specifically developed for the problem, and good agreement is found. In perspective, the proposed platform can serve for the precise characterization of gas transfer properties of soap films made from different surfactant mixtures and in the presence of different gases.

Crypsis by background matching and disruptive coloration as drivers of substrate occupation in sympatric Amazonian bark praying mantises

Background matching and disruptive coloration are common camouflage strategies in nature, but few studies have accurately measured their protective value in living organisms. Amazon's Bark praying mantises exhibit colour patterns matching whitish and greenish-brown tree trunks. We tested the functional significance of background matching and disruptive coloration of different praying mantis morphospecies (white, grey and green) detected by DNA barcoding. Through image analysis, avian visual models and field experiments using humans as potential predators, we explored whether the background occupation of mantises provides camouflage against predation. Data were obtained for individuals against their occupied tree trunks (whitish or greenish-brown) and microhabitats (lichen or bryophyte patches), compared to non-occupied trunks. White and grey mantises showed lower colour contrasts against occupied trunks at the scale of tree trunk, with no differences in luminance contrasts. Conversely, green mantises showed lower colour and luminance contrasts against microhabitats and also exhibited high edge disruption against greenish-brown trunks. The camouflage of white and green mantis models against colour-matching trunks increased search time and reduced encounter distance of human predators. We highlight the importance of camouflage strategies at different spatial scales to enhance individual survival against predators. Specifically, we present a stunning study system to investigate the relationship of phylogenetically related species that use camouflage in sympatry.

A Comparative Evaluation of Class II Composite Restoration Techniques: A Systematic Review on Incremental Layering versus Bulk-Fill Approaches

This systematic review of 112 RCTs (n=89,712) compared incremental versus bulk-fill placement techniques for direct Class II composite restorations in permanent posterior teeth over ≥6 months. Meta-analyses found no significant differences between groups for retention, recurrent caries, marginal adaptation, fracture, postoperative sensitivity, surface roughness, color match, or anatomic form (p&gt;0.05 for all). Bulk-fill had less marginal staining (p=0.01). Clinical performance correlated more with materials and protocols than placement technique. Challenges like microleakage and wear persisted long-term. Neither incremental nor bulk-fill demonstrated clear superiority across clinical outcomes over up to 7 years. Both can provide durable posterior restorations. Practitioners should use professional judgment in technique selection based on clinical factors. Further long-term RCTs are warranted to reinforce these conclusions that neither placement technique showed superior clinical performance for direct Class II composite restorations.

Leukocytic platelet rich fibrin (L-PRF) versus subepithelial connective tissue graft (SCTG) using tunneling technique in treatment of gingival recession: Randomize controlled clinical study

Introduction: Gingival recession is a problem encountered daily in clinical practice, its etiology is often a multifactorial one. Surgical treatment is the only method to reverse this condition. Objective: to evaluate the effectiveness of leukocytic platelet rich fibrins (L-PRF) versus subepithelial connective tissue graft (SCTG) in the management of recession defects Miller’s class I or II (RT1) using the tunnel technique (TUN). Methods: 20 systemically healthy patients were allocated randomly to TUN with L-PRF (group A), and TUN with SCTG (group B). Probing depth, clinical attachment level, recession depth, width of keratinized tissue, gingival thickness, and recession esthetic score and wound healing index are clinical variables measured at baseline,14 days, 3 months, and 6 months postoperatively. Results: Significant improvement in mean CAL, and RD for both groups, and significant difference in GT and WKT for group B as well as higher RES. A significant difference was also recorded in group A for WHI Conclusions: Both grafting modalities in combination with tunnel technique improved gingival phenotype switching. Although SCTG gives higher esthetic and functional results including better color matching, tissue contour and increased width of keratinized tissue, L-PRF has superior healing properties and can be used as an alternative to treat multiple gingival recession defects where the need of second surgical site is eliminated.

A facile route to extend the color gamut of cochineal, Dactylopius coccus costa, natural dye on wool textiles

Color gamut of cochineal, Dactylopius coccus costa, is limited to several tones restricting its application, so, it is necessary to explore a simple and economic method to develop its color shades on textiles. To this aim, in the present study, binary combinations of eight metal salts (Al, Sn, Cr, Cu, Fe, Ni, Co, Zn) were exploited in conventional pre-mordant dyeing of wool with cochineal, afterwards, color strength, color shade, and color fastness were investigated using reflectance spectroscopy and standard test methods. Binary metal mordanting produced different sober new color shades of dark and light red, brown, magenta, purple, and black on wool with enhanced light, washing, and rubbing fastness. Interestingly, color matching of some legally restricted hazardous mordants like Cr was plausible with alternative eco-friendlier binary mordants like Fe + Zn. It was concluded that binary combination of metal mordants not only is a simple route to extend the color gamut of cochineal on wool with satisfactory color fastness but also makes natural dyeing eco-friendlier compared to conventional dyeing.

Effect of primary peak wavelength and stimulus size on metameric failure through color difference evaluations

AbstractTristimulus values and chromaticities, which are derived using the color matching functions (CMFs), are commonly used for color characterization, calibration, and specifications, with the stimuli having the same values believed to have the same color appearance (i.e., metameric match). Many studies, however, found that the stimuli having the same tristimulus values do not appear the same (known as metameric failure) due to the failure of CMFs in accurately characterizing the color matching mechanisms. Most past work investigated the performance of different CMFs through color matching experiments, with a smaller chromaticity or calculated color difference between the reference and test stimuli suggesting a better performance. Such differences, however, may not accurately characterize the performance of the CMFs, since the color spaces or chromaticity diagrams may not be uniform, in terms of the threshold of noticeable color difference. In this study, the human observers evaluated the perceived color difference between pairs of stimuli, which were calibrated to have the same tristimulus values calculated using the CIE 1931 2° CMFs, with two sizes of field of view (FOV). The results clearly suggested that the stimuli having the same tristimulus values may not always appear the same, which depended on the primaries and the FOV. More importantly, the results clearly suggested that the chromaticity differences from color matching experiments may overestimate the metameric failure, especially when the color differences were small.

The Age Effect on Observer Colour Matching and Individual Colour Matching Functions

The Age Effect on Observer Colour Matching and Individual Colour Matching Functions