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Quantitative Analysis of Pictorial Color Image Difference
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BibTeX
@MISC{Chung_quantitativeanalysis,
author = {Robert Chung and Yoshikazu Shimamura},
title = {Quantitative Analysis of Pictorial Color Image Difference},
year = {}
}
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Abstract
As such, the use of ∆E LAB to specify color tolerances of ink has been common in the graphic arts. However, there is no easy way to assess color difference quantitatively between two complex images, e.g., a pictorial color proof and its corresponding press sheet. Consequently, the practice of qualifying a color proofing system which conforms to a known printing condition or verifying printed products that match a contract proof remains visual and subjective. This paper uses a standard press characterization target (IT8.7/3 basic block) to quantify pictorial color image difference by colorimetry. Colorimetric measurement conditions and ∆E(LAB) calculations adhere to the ANSI CGATS.5-1993 standard. Comparison of color images with the same colorant conditions and images with different colorant conditions were investigated. The quantitative analysis mainly focuses on the use of cumulative relative frequency (CRF) of the ∆E distribution. We learned that a visual match between two color images can be specified by means of the CRF curve and its derived statistics. In addition, a visual match between two color images imposes a tighter colorimetric tolerance than process conformance as specified by solid ink density and dot gain.
Keyphrases
quantitative analysis pictorial color image difference color image visual match tighter colorimetric tolerance different colorant condition crf curve printing condition color difference corresponding press sheet color proofing system process conformance derived statistic pictorial color proof complex image ansi cgats basic block color tolerance graphic art 5-1993 standard solid ink density printed product colorant condition standard press characterization target easy way cumulative relative frequency dot gain contract proof colorimetric measurement condition
