Document Detail

Influence of room lighting on grey-scale perception with a CRT-and a TFT monitor display.
MedLine Citation:
PMID:  12058268     Owner:  NLM     Status:  MEDLINE    
OBJECTIVES: To determine the influence of ambient lighting on grey-scale perception using a cathode-ray tube (CRT) and a thin film transistor (TFT) computer display. METHODS: A cathode ray tube (Nokia XS 446) and a liquid crystal display (Panasonic LC 50S) were used at reduced room lighting (70 lux) and under conditions recommended for a dental operatory (1000 lux). Twenty-seven observers examined twice a modified SMPTE test pattern [0 to 255; 255 to 0] grey-scale values. The corresponding contrast differences were allocated to four ranges of grey levels (I: 0-63; II: 64-127; III: 128-191; IV: 192-255). The influences of monitor type, grey-scale range and illumination were evaluated by means of repeated measures analysis of variance. RESULTS: Detection of differences in monochromatic intensity was significantly earlier with reduced lighting (P<0.0001). When full ambient lighting was used, the TFT display was superior compared to the CRT monitor in ranges II and III (P<0.0001), whereas no differences could be detected for grey intensities between 0 and 63 (P=0.71) and between 192 and 255 (P=0.36). CONCLUSIONS: Background lighting hampers grey-scale perception on computer displays. In this study of one TFT and one CRT monitor, the TFT in full ambient lighting was associated with earlier detection of grey scale differences than CRT.
R Haak; M J Wicht; M Hellmich; G Nowak; M J Noack
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Dento maxillo facial radiology     Volume:  31     ISSN:  0250-832X     ISO Abbreviation:  Dentomaxillofac Radiol     Publication Date:  2002 May 
Date Detail:
Created Date:  2002-06-11     Completed Date:  2002-09-27     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  7609576     Medline TA:  Dentomaxillofac Radiol     Country:  England    
Other Details:
Languages:  eng     Pagination:  193-7     Citation Subset:  D    
Department of Operative Dentistry and Periodontology, University of Cologne, Köln, Germany.
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MeSH Terms
Analysis of Variance
Color Perception*
Computer Terminals*
Data Display*
Differential Threshold
Equipment Design
Photic Stimulation

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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