TOWARD A MORE ACCURATE AND EXTENSIBLE COLORIMETRY .4. VISUAL EXPERIMENTS WITH BRIGHT FIELDS AND BOTH 10-DEGREES AND 1.3-DEGREES FIELD SIZES

Bright strongly metameric visually matching pairs of white lights are studied. Generally one member of the pair is a constant broadband refe rence white, in accordance with the Maxwell method. Spectral compositi ons of the other member are chosen from eight types found in Parts I, II, and III to lead to tristimulus errors, over a large range of magni tude, by the 1964 CIE Standard Observer. Field luminance has been trip led over that of the earlier work to the order of 100 cd/m(2), the ran ge of typical industrial color-matching Experiments with visual fields of 1.3 degrees have been added. Tristimulus errors in computations by the appropriate CIE Standard Observer, at the higher brightness level s, and at visual field sizes of both 10 degrees and 1.3 degrees, are a s large as those found in the earlier work with dimmer 10 degrees fiel ds. (C) 1997 John Wiley & Sons, Inc.