GWG Annouces New Specifications for Large-Format Digital & Screen Printing

GWG Serving Additional Market Applications
The new specifications added to the GWG release v3 2005 set address two new, rapidly expanding markets:

For large-format digital printing—specialized high resolution print productions using screen rulings higher than 150 lpi (60 l/cm) or using special screening technologies like FM, Stochastic, or large format printing (where the pages are created at a fraction of the final output size).
• very high resolution (without downsampling) CMYK (CmykVeryHiRes_1v3)
• CMYK+spot (SpotVeryHiRes_1v3)
In the “standard” GWG CMYK HiRes specifications, color and grayscale images shall not be below 100 dpi and should not be above 300 dpi. This is common practice for many Hi Res printing applications using traditional screening with screen rulings up to 150 lpi (60 l/cm). For special productions, the use of higher frequency screens, FM screening, Stochastic screening, or a mix of some of these technologies may require higher image resolutions in order to result in the best possible, fine detail in print. For such projects, GWG recommends using the specifications “CmykVeryHiRes” and “SpotVeryHiRes”.
Using these settings will leave the image resolution unchanged (i.e., no downsampling during PDF creation and preflighting). Image resolution for VeryHiRes applications may vary depending on the screening technology used, as well as on subject matter.
As a rule of thumb for “traditional” screening, it is recommended that image resolution should be 1.5 to 2x the screen resolution. For alternative screening technologies (such as FM, Stochastic, etc.), you may follow the instructions of your supplier or define the optimum image resolution yourself by printing test targets.