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Paper Chase Tecco Paper Selection - part 2 of 1 2 3 4

by Mike McNamee Published 01/08/2009

The SPD confirms the visual observations, some of these papers are very active at the blue end of the spectrum, with the highest lifts at 440nm that we have measured.

Although the statistics do not reveal all about the performance of any given paper/printer/ink combination they are all we have in terms of purely objective analysis. We back this by looking at prints and, more importantly, looking at the data very carefully. Often the devil is in the detail! In this test-series the Granger Chart proved to be vital as it revealed differences in the make-up of the profiles which we eventually found by reverse engineering the profiles and looking around the profile codes themselves. This seems to explain (we put it no stronger than that) an anomaly in the Granger Chart, present on all the papers other than the SGD 250. This was profiled using 'New Gamut mapping LO.3' rather than the 'CIECAM02' used on the other five papers we looked at in detail. The effect on the print is shown on the composite image (top right) which will hopefully survive the conversion onto the printing press. There is no other evidence in the error statistics to give the game away and we are not sure just how important it is. There is a reduced effect when applying Relative Colormetric rendering intent instead of the Perceptual that is called up by the data sheets. It is another example of just how vigilant you have to be when paper testing! Detailed analysis of the Spectral Power Distributions (SPD) from the instruments confirmed what we had observed in both visible and ultraviolet light. Some of these papers are the coolest we have measured and exhibit the highest OBA lifts we have measured.

This graph clearly separates papers with and without OBAs. Those in beize have no OBA and show no lift at the blue end of the spectrum. Those in blue all show a lift in reflectance.

Although this can create very bright and crisp prints we are not too keen on so much OBA, as it leaves a paper vulnerable to an equivalently large amount of yellowing. Purists generally keep away from the high OBA variants although these have RIT confirmed properties of up to 50 years. The effect of the cool base colour of the paper reduces the accuracy of the skin tones and drops the overall error statistics a notch or two. In the graph, the large lifts of the PM230 Matt, Ultrawhite Glossy and Luster variants are obvious, the remaining materials lie in a more normal range

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1st Published 01/08/2009
last update 09/12/2022 14:59:35

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Paper Chase Tecco Paper Selection - part 2 of 1 2 3 4