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Abstract
Veiling glare reduces image contrast. Although it is present in all cameras, there is little information on the causes and practical significance of veiling glare available to users of digital cameras. Different ways of measuring this parameter are proposed, including some based on an ISO standard and others more appropriate for home use. A simple technique for artificially increasing veiling glare in a camera is described. With 'optimum print width' as a metric, the effects of various levels of veiling glare on reducing spatial image content, using both high-and low-contrast sector star test patterns, are reported. Performance data for different cameras are presented both with and without the use of image enhancement software. Although the effect of veiling glare can be reduced in this way, the user is strongly advised to take care in avoiding lens contamination, as this is a common problem which is difficult to avoid.