Description

Tolerance is the permissible difference between sample measurement and the aim and is used to determine the acceptability of a product. A well-known example is the color tolerance of printed solids in ISO 12647-2. The first edition of ISO 12647-2 was published in 1996. It has gone through two major revisions. In the 2004 revision, the magnitude of the color tolerance (∆E*ab) was changed. In the 2013 revision, a new color tolerance metric (∆E00) was included. No justification was found regarding the ISO 12647-2 revisions. In this research, %Pass is used to study the effect of color tolerance in a database. Recognizing that tolerance is a man-made decision, if the tolerance is too tight, the %Pass will be low; and vice versa. This research also examines the use of the equal %Pass to determine the tolerance equivalency between the old (∆E*ab) and the new (∆E00) parameter. The results show that there is no convergence between ∆E*ab and ∆E00 when using the boundary data approach. However, there is an equivalent tolerance between ∆E*ab and ∆E00 using the equal %Pass approach. The current ISO 12647-2 standard, using 3.5 ∆E00 for CMY and 5 ∆E00 for black, resulted in unequal %Pass. By using the equal %Pass approach, the black solid tolerance does not need to be different than cyan and magenta solids, but the yellow solid tolerance can be smaller than cyan and magenta solids.

Date of creation, presentation, or exhibit

2015

Comments

Originally presented at TAGA Annual Technical Conference 2015

Document Type

Conference Proceeding

Department, Program, or Center

School of Media Sciences (CIAS)

Campus

RIT – Main Campus

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