Christopher Smyth

An Investigation of Near Neutral (‘G7’) and TVI for Process Control

Christopher Smyth and Alexander Hyams, Ryerson University

With regards to this proposal, please note that I am a member of the Idealliance Print Properties and Colorimetric Council, as well as a certified G7 Expert.

Near neutral and TVI (tone value increase) are two different approaches to characterizing and controlling CMYK print processes. The near neutral method has a variety of techniques, including the Idealliance’s G7 ® methodology as well as the ‘Heidelberg method’ and ‘RIT method’ (Wang 2012).

This research project seeks to first capture an overview of the use of the G7 methodology for characterization and process control, as well as use in different print production processes (offset lithography, flexography, digital…). This is done through an online survey tool.
The second part of this research is an evaluation and comparison of G7 and TVI approach to process control using a press modeling approach. A inkjet printer configured with CRPC6 characterization set is used as a physical output device, and the native print condition is altered image editing software to simulate a variety of printing issues. Correction curves are built using calibration software; the resulting runs are compared using measurements, as well as subjective evaluations.