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Summary:
The calibration and accurate modeling of high resolution color monitors is fundamental to the role they play as editorial stations in Color Electronic Prepress Systems (CEPS). However, the work does not end with a colorimetric characterization of the output device. An important part of soft proofing involves understanding the contribution of relative tone reproduction to similarity of appearance on media of different dynamic range and maximum luminance. Bartleson and Breneman drew attention to this factor in a study in which people were asked to assign subjective magnitudes to discrete regions of scene luminance in conventional images. In this paper we re-examine their equation for rendering constant relative brightness, applied to the situation of soft- to hardcopy-proof agreement. We describe an experiment using images which have no meaning or perceptual associations, but which have the same overall spatial statistics as conventional images. We review methods for generating phase-randomized, monochrome images from conventional images having various luminance probability distributions (e.g., low- or high-key pictures.) Halftone proofs of such images were made for comparison to renditions on the monitor which use Bartleson and Breneman's formula for tonal remapping and one based on uniform gradients of L* (CIE Psychometric Lightness). Subjective preferences for one force choice comparisons between the two monitor renditions and the proof. Implications of the results and the potential of the technique are discussed. Bartleson and Breneman drew attention to this factor in a study in which people were asked to assign subjective magnitudes to discrete regions of scene luminance in conventional images. In this paper we re-examine their equation for rendering constant relative brightness, applied to the situation of soft- to hardcopy-proof agreement. We describe an experiment using images which have no meaning or perceptual associations, but which have the same overall spatial statistics as conventional images. We review methods for generating phase-randomized, monochrome images from conventional images having various luminance probability distributions (e.g., low- or high-key pictures.) Halftone proofs of such images were made for comparison to renditions on the monitor which use Bartleson and Breneman's formula for tonal remapping and one based on uniform gradients of L* (CIE Psychometric Lightness). Subjective preferences for one force choice comparisons between the two monitor renditions and the proof. Implications of the results and the potential of the technique are discussed.