Calibrating, Printing and Proofing by the G7™ Method
Calibrating, Printing and Proofing by the G7™ Method
Calibrating, Printing and Proofing by the G7™ Method
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<strong>Calibrating</strong>, <strong>Printing</strong> <strong>and</strong> <strong>Proofing</strong> <strong>by</strong> <strong>the</strong> G7 <strong>Method</strong> Version 6, August 2006<br />
1.7 In search of international unity<br />
The two most widely-promoted characterization data sets for commercial printing come from FOGRA<br />
<strong>and</strong> GRACoL 7. The visual differences are quite small, as shown <strong>by</strong> <strong>the</strong> illustrations below, in spite of<br />
significantly different TVI curves shown below each image. This is not surprising as <strong>the</strong> GRACoL 7 Beta<br />
02 Characterization Data was based largely on FOGRA39, but adjusted to fit <strong>the</strong> GRACoL NPDC <strong>and</strong><br />
gray balance definitions.<br />
The final TC 130 data (see 1.5) will probably be similar to both, but remember that this will <strong>the</strong>n have to<br />
be ratified <strong>by</strong> all <strong>the</strong> TC 130 delegates before becoming an official ISO st<strong>and</strong>ard.<br />
IMPORTANT: Although closely tied to ISO 12647-2, <strong>the</strong> GRACoL 7 Characterization Data <strong>and</strong> NPDC<br />
curves are NOT an official st<strong>and</strong>ard, but simply one of several possible 'appearances' allowed under<br />
ISO 12647-2. Any future ISO characterization data may lead to a change in <strong>the</strong> GRACoL 7 or FOGRA<br />
data.<br />
Interpretations of ISO 12647-2 <strong>by</strong> <strong>the</strong> TVI method (left) <strong>and</strong> <strong>the</strong> G7 method (right) <strong>and</strong> <strong>the</strong>ir relative<br />
CIEXYZ-based TVI curves (below). Remember <strong>the</strong>se SCID images have no 'right' or 'wrong'<br />
appearance. (Color <strong>and</strong> density may vary depending on viewing <strong>and</strong> reproduction conditions.)<br />
NOTE: The TVI curves shown above are calculated from CIEXYZ data (see 2.9) - NOT density<br />
readings, <strong>and</strong> are intended for comparative purposes only.<br />
7 Copyright © International Digital Enterprise Alliance, Inc. [IDEAlliance] (2006). All Rights Reserved.