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Paper Chase Breathing Color Canvas Options from the Imaging Warehouse - part 2 of 1 2 3 4 5

by Mike McNamee Published 01/08/2011

In real prints, the highlights became undifferentiated beyond 249 RGB points, the shadows below 30 points. The highlights were unchanged by varnishing, the blacks were opened up slightly so that 25 was detectable, but only in the viewing booth (at 2,000 lux). The loss of detail from the canvas surface makes these tests difficult to interpret. The Granger Chart was very smooth, as was the grey ramp. Metamerism, as measured by the Colour Inconstancy Index, was reasonably low at 1.34 (ΔE00 D65 to Tungsten A on 50% grey).

Overall then these were a good set of results with no surprises or hidden flaws.

Real prints

We made some real prints and chose Paul Gallagher's seascape for its tricky whites in the foaming surf along with a field of poppies (for its very high gamut red tones). Both prints looked first-class before and after varnishing. The red of the poppies held up well despite the original tone being on the boundary of what ink on paper is capable of. The mapping of the colour into printing gamut is almost exactly matched by the shift of that tone in the HiGAM patch set.

This is the first time we have reported canvas testing using the latest HiGAM patch target and so it is worth a little more detail. The high-gamut patches are plotted on the graph with blue diamonds. Note that they are chosen to represent colours from all around the colour wheel and that they are situated well out in the gamut field, ie not close to the centre (origin) of the graph. The actual colour values measured on Lyve Canvas are plotted in magenta squares. Note that they are in-board of the file values (blue diamonds) indicating a reduction in saturation. The left-hand screen grab for the poppy image shows Photoshop set up to soft proof using the profile for Lyve Canvas with the gamut warning also turned on. The media is actually doing rather well, you may even struggle to see the small patches of grey on parts of the petals; in other words the colours are being reproduced quite well. The histogram from the BabelColor software has been set up to isolate just the chroma (saturation) component of the errors. Note that the majority of the patches are shown to the left (less saturated) of the datum line and that some of them deliver errors of more than 20 units. Overall though, for an unvarnished canvas the Lyve is performing well; this is a very searching test, the righthand screen grab show just how poor ink-on-paper-cmyk used for this magazine is, a pale imitation of the full-blooded inkjet print!

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1st Published 01/08/2011
last update 09/12/2022 14:51:56

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