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gmg ColorProof - part 3 of 1 2 3

by Mike McNamee Published 01/02/2010

The graph illustrates that the Fogra swatch set of the Version 3 target is more onerous than using a set of Macbeth ColorChecker swatches. There are more colours and they extend further into the gamut field than the Macbeth set. The lower graph shows data from a number of Epson printers profiled during the past couple of years. The average ΔE₀₀ for Macbeth swatches is indicated by the green line. The red line shows the data from a GMG ColorProof print which outperforms all the other tests threefold on the average, and twofold on the best result.

Such accuracy comes at a cost. Everything about the way the calibrations and measuring are carried out has to be rigorous. Errors such as having the wrong backing paper during the test or failing to allow enough time for dry down will throw the results out of calibration. Although we did not measure them, we formed the impression that temperature and humidity were also interfering with our testing (carried out while we were snowed in!). One calibration required six iterations to bring things under control, which is quite a lot of measuring and quite a lot of expensive proofing paper. Such is the price of quality!

WHERE NEXT?

Despite our best endeavours we are only part of the way towards investigating the scope of this RIP. We know that it is being used to produce fine-art giclee prints in an RGB workflow where the additional gamut of printers such as the Epson 7900 may be exploited. Hopefully we will be able to conduct more testing before the next issue of Professional Imagemaker and fill in the gaps in our knowledge. All that we have seen so far suggests that time spent doing so is going to be time well spent - watch this space!

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1st Published 01/02/2010
last update 09/12/2022 14:54:46

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