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Nazdar announces qualification of first DTG printed T-Shirt in G7 methodology


Nazdar Ink Technologies has announced that its technical service group has qualified the first direct to garment (DTG) printed T-Shirt in the G7 methodology of colour control for grey balance. DTG is the newest category for G7 qualifications by Idealliance.

G7 is the colour control methodology that achieves colour similarity across all print processes. The method balances the four primary process printing colours, CMYK and their three overprints RGB (the 7 in G7) to achieve neutral grey (the G in G7) in a raster image. This methodology was created in 2006 by Don Hutcheson and used primarily by the offset lithography printing process at that time.

In 2008, Nazdar Consulting Services introduced the G7 methodology to the screen and wide format graphic inkjet printing processes as the best way to achieve a common appearance in images when printed on different substrates, using different printing processes. This was a big departure from the existing printing specifications (SNAP, GRACoL, and SWOP) which were specific to the offset printing process on a certain grade of paper.

Bruce Ridge, director technical services at Nazdar Ink Technologies, explained: ‘The G7 methodology is not a print specification as it does not prescribe how to achieve a result, just the result, which in this case is neutral grey balance in the quarter to three quarter tonal areas of an image and a shared neutral appearance. There are two other levels of G7 conformity that can be achieved, Targeted and Colourspace.

‘The focus on the grey balance in the quarter to three quarter tonal areas allows flexibility in substrate and ink deviations. This is critical to the screen and ink jet printing processes where the substrate white point can vary tremendously, and the ink hues may vary from the traditional hue targets originally set by offset inks.’


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