Calibrating, Printing and Proofing by the G7™ Method

Calibrating, Printing and Proofing by the G7 Method Version 6, August 2006
11 Custom-Calibrated and Non ICC-Compatible Proofers....................................... 35
12 Soft Proofing (Video Proofing) ............................................................................ 36
12.1 Basic requirements ............................................................................................................................................. 36
12.2 Soft proofing in Adobe Photoshop..................................................................................................................... 36
12.3 Remote soft proofing .......................................................................................................................................... 37
Appendix A: Production Press Control .................................................................... 38
A.1 Run press up to nominal ink levels...................................................................................................................... 38
A.2 Adjust gray balance, HR_cmy and SC_cmy....................................................................................................... 38
A.3 Adjust HR_k and SC_k ........................................................................................................................................ 38
A.4 Nominal HR, SC and HC aim values................................................................................................................... 38
A.5 HR, SC and HC aim values for other dynamic ranges....................................................................................... 39
A.6 Maintaining gray balance by CIELab................................................................................................................... 39
A.7 Maintaining gray balance by CMY density.......................................................................................................... 39
Appendix B: G7 FanGraph Paper ............................................................................. 40
B.1 Changes since the last edition............................................................................................................................. 40
B.2 NPDC FanGraphs (CMY and K)......................................................................................................................... 40
B.3 Possible future changes....................................................................................................................................... 40
B.4 Matching the black NPDC to the CMY NPDC .................................................................................................... 40
Appendix C: Example Graph .................................................................................... 43
Appendix D: Fractional Percentage Calculations ................................................... 44
D.1 The problem with integer percentages................................................................................................................ 44
D.2 Converting integer percentage to integer 8-bit (Excel) ...................................................................................... 44
D.3 Converting integer 8-bit to fractional percentage (Excel)................................................................................... 44
D.4 Converting integer percentage to fractional percentage.................................................................................... 44
D.5 GRACoL fractional percentage conversion chart ............................................................................................... 45
Appendix E: Gray Balance and NPDC ...................................................................... 46
E.1 G7 specified gray balance ................................................................................................................................... 46
E.2 Nominal target a* and b* values for standard papers ........................................................................................ 47
E.3 Printing on non-standard paper color.................................................................................................................. 48
E.4 Determining 'natural' CtP curves ......................................................................................................................... 49
E.5 Relationship of NPDC to TVI ............................................................................................................................... 49
Appendix F: Introduction to CIELab ....................................................................... 50
Appendix G: Tolerance Notes.................................................................................. 51
G.1 Introduction........................................................................................................................................................... 51
G.2 When tight pressroom tolerances are NOT appropriate.................................................................................... 51
G.3 When tight pressroom tolerances ARE appropriate .......................................................................................... 51
G.4 GRACoL 7 tolerances vs. custom user tolerances ............................................................................................ 51
G.5 Characterization vs. production tolerances ........................................................................................................ 52
G.6 Printing vs. proofing tolerances........................................................................................................................... 52
Appendix H: ISO 12647-2 Solid Ink Values.............................................................. 53
Glossary...................................................................................................................... 54
iv Copyright © International Digital Enterprise Alliance, Inc. [IDEAlliance] (2006). All Rights Reserved.