Proof L


94.04 94.04 93.87 93.87 94.93 94.93 94.10 94.10


a


0.79 0.79 1.15 1.15


3.41 3.41 1.29 1.29


b


-2.82 -2.82 -4.91 -4.91 -9.52 -9.52 -3.67 -3.67


Press Sheet L


94.86 94.08 94.86 94.08 94.86 94.08 94.86 94.08


a


3.22 1.29 3.22 1.29 3.22 1.29 3.22 1.29


b


-9.24 -3.54 -9.24 -3.54 -9.24 -3.54 -9.24 -3.54


Acceptability %s 1a (unacceptable) to 4d (acceptable) 2b


1a


100 57 14


14 14


14 28 43 28


3c


28 43 14 28 28 26


with a slightly “bluer” whitepoint, (95, 1, -4) in an effort to find a better “match” with current papers.


Current Proof-to-Press Assessments Our continuing research will focus on two parts. The first seeks to verify the applicability of GRACoL2013 (which is built using CRPC-6) as an M1 reference data set for current commercial printing on a range of OBA stocks available in the North American market.


The second is to check on the visual acceptability of proof-to-press matches for combinations of low-, moderate-, and higher-OBA media (proofs and press sheet samples) derived using M1 measurements. This involves capturing the opinions of a variety of observers as to the acceptability of a particular proof-to-press match under ISO 3664:2009-compli- ant and controlled viewing conditions.


In addition, other surveys were completed using different participants and combinations of proofing stocks and press sheets.


The resulting data and analysis could help establish best practices for working with OBA-influenced stocks in the printing value chain (buyers, clients, preproduction, printers, etc.). As well, it could support the theory that the North American print- ing industry could benefit from a new, additional, characterization set, specifically developed for high- er-OBA workflows.


Caliper partners with PIA to provide exclusive member benefits including; • 10% discount on hiring assessments • 10% discount on staff development tools


• In depth experience working with printing industry industry professionals


To find out more, visit calipercorp.com/pia


4d


28 43 28 28 28 70 43


Figure 1. Sample results from a survey of Idealliance ‘G7’ training attendees in Toronto, Canada. The results of this version of the survey indicate the most acceptable proof-to-press matches (4d, green column) are with a moderate OBA stock, made with CRPC6 with a higher OBA content press sheet. The least acceptable match (red column, 1a) was with a lower OBA proofing stock made using older GRACoL 2006 data, when compared to a higher OBA press sheet.


Learn more about OBAs and this research at the Technical Association of the Graphic Arts Tech Conference in Houston from March 19 to 22. Or keep an eye out for the 2017 TAGA Proceedings—including all conference presentations— which will be released later this year.


The Magazine 35


WINTER 2017


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