Document Detail

The Visi-Chroma VC-100: a new imaging colorimeter for dermatocosmetic research.
MedLine Citation:
PMID:  11301637     Owner:  NLM     Status:  MEDLINE    
BACKGROUND/AIMS: It was the aim of this study to carry out a comparative evaluation in vitro on standardized color charts and in vivo on healthy subjects using the Visi-Chroma VC-100, a new imaging tristimulus colorimeter and the Minolta Chromameter CR-200 as a reference instrument. The Visi-Chroma combines tristimulus color analysis with full color visualization of the skin area measured. The technical performances of both instruments were compared with the purpose of validating the use of this new imaging colorimeter in dermatocosmetic research. METHODS: In vitro L*a*b* color parameters were taken with both instruments on standardized color charts (Macbeth and RAL charts) in order to evaluate accuracy, sensitivity range and repeatability. These measurements were completed by in vivo studies on different sites of human skin and studies of color changes induced by topical chemical agents on forearm skin. The accuracy, sensitivity range and repeatability of measurements of selected distances and surfaces in the measuring zone considered and specific color determinations of specific skin zones were also determined. RESULTS: The technical performance of this imaging colorimeter was rather good, with low coefficients of variation for repeatability of in vitro and vivo color measurements. High positive correlations were established in vitro and in vivo over a wide range of color measurements. The imaging colorimeter was able to measure the L*a*b* color parameters of specific chosen parts of the skin area considered and to measure accurately selected distances and surfaces in the same skin site considered. CONCLUSION: These comparative measurements show that both instruments have very similar technical performances and that high levels of correlation were obtained in vitro and in vivo using the L*a*b* color parameters. In addition, the Visi-Chroma presents the following improvements: 1) direct visualization and recording of the skin area considered with concomitant color measurements; 2) determination of the specific color parameters of skin areas chosen in the total measuring area; and 3) accurate determination of selected distances and surfaces in the same skin areas chosen.
A O Barel; P Clarys; K Alewaeters; C Duez; J L Hubinon; M Mommaerts
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Publication Detail:
Type:  Comparative Study; Evaluation Studies; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Skin research and technology : official journal of International Society for Bioengineering and the Skin (ISBS) [and] International Society for Digital Imaging of Skin (ISDIS) [and] International Society for Skin Imaging (ISSI)     Volume:  7     ISSN:  0909-752X     ISO Abbreviation:  Skin Res Technol     Publication Date:  2001 Feb 
Date Detail:
Created Date:  2001-04-13     Completed Date:  2001-05-10     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9504453     Medline TA:  Skin Res Technol     Country:  Denmark    
Other Details:
Languages:  eng     Pagination:  24-31     Citation Subset:  IM    
Faculty of Physical Education and Physiotherapy, Free University of Brussels (VUB), Brussels, USA.
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MeSH Terms
Colorimetry / instrumentation*,  standards
Dermatology / instrumentation,  standards
Reference Values
Skin / anatomy & histology*
Skin Diseases / diagnosis*

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