&lt;title&gt;Development and standardization of a spectral characteristics database for evaluating color reproduction in image input devices&lt;/title&gt;

Luo

Color Research & Application

et al. 2017

This article focuses on human skin colour. Three different colour measuring instruments were used: a tele‐spectroradiometer, a de:8° and a 45°:0° spectrophotometers. They were used to measure 47 subjects who were divided into four skin groups: Chinese, Caucasian, South‐Asian, and Dark. Eight locations for each subject were measured. The spectral reflectance results were first compared. They all showed the “W” shape between the 550 nm and 580 nm as found by the other studies. Those from the tele‐spectroradiometer had an increase from 600 nm while the others were flatter. The colorimetric data calculated from the spectral measurements revealed similar patterns to describe the colour distribution of each skin group. It was found that two scales: whiteness‐depth, and blackness‐vividness could well describe these distributions. The results also showed systematic differences between the four ethnic groups, between eight body locations, between two genders, and between the measurements from the three instruments.

Section: Introductionmentioning

confidence: 99%

Spectrophotometric measurement of human skin colour

Luo

Color Research & Application

et al. 2017

“…The CM700d was used to measure 10 locations of each subject: forehead (FH), cheek, cheekbone (CB), neck, chin, inner forearm (IF), outer forearm (OF), back of hand (BH), nose tip (NT) and fingertip (FT). The measurement locations were selected based on the previous research [8,9] . Then the same subject was invited to sit inside the light booth of the DigiEye system where only five locations -forehead (FH), cheek, cheekbone (CB), neck and back of hand (BH) -were measured using the PR650.…”

Section: Skin Color Measurement and Databasementioning

confidence: 99%

Measuring Human Skin Colour

Wang¹,

Xiao²,

Wuerger³

et al. 2015

cic

Human skin colour measurements from four ethnic groups including 188 subjects were accumulated. Five to ten locations of each subject were measured by using two different instruments, a tele-spectroradiometer and a spectrophotometer. Three repeated measurements were accumulated for each location. Repeatability of the measurements at different locations from different ethnicities was examined using the mean CIELAB colour difference from the mean (MCDM). The colour distribution between different locations of different ethnic groups was also studied by plotting the data in a * b * and L * C * ab planes. Systematic trends were found between different ethnicities and instruments.

“…The Standard Object Color Spectra (SOCS) database in the ISO TR 16066 standard was developed for proper evaluation of the color sensor quality of image input devices. [10][11][12] The spectra of 53,361 objects were collected from 9 categories, which cover practically all object colors. These are photographic materials (Transparencies/Reflection prints), graphic prints (Offset/ Gravure), computer color prints (dye sublimation/ electrostatic/ink-jet), paint (not for art), paints (oil paints/ water colors), textiles (synthetic dyes/plant dyes), flowers and leaves, outdoor scenes (Krinov data except for flowers and leaves), and human skin.…”

Section: Sensitivity Of Color Reproduction To B Primarymentioning

confidence: 99%

New Set of RGB Primaries for Display Covering Full Range of Real World Object Colors

Kim¹,

Park²

2007

jist

It is inevitable that there are some colors that cannot be reproduced with three primaries even in the case of a laser display. The purpose of this study is to define a new set of RGB primaries for display that can reproduce all real world object colors. At the first step, the region of real world object colors was estimated from the comparison between the measurement data of 453 object colors and the 1294 standard data of Munsell colors. Through the second step, the region boundary of real world object colors was optimized as a triangle according to two rules. Accordingly the wavelengths of RGB primaries were defined as 630, 532, and 468 nm, respectively. At the third step, with the help of 53,361 SOCS data, the tolerance limit of B primary was also defined as the range of 463-468 nm. Finally, the color reproducibility of commercial laser display systems was evaluated using the optimum gamut as a criterion.