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Paper Chase - Somerset Photo Paper - part 2 of 1 2 3 4 5 6 7

by Mike McNamee Published

The paper was visually cool with a base white extending almost 7 points towards blue and a lift in the spectral trace of about 6half per cent at 440nm. In the UV booth it stood out as really bright. For this reason we expected the statistical data on our audit process to be slightly compromised and this turned out to be the case.

Sihl provide a number of icc profiles for the 4800 and 4802 gloss materials using the printers listed in the table. There are a comprehensive set of profiles available for the leading RIPs. Other icc printer profiles will, no doubt, follow. The profiles were quite small at 631KB suggesting a small number of swatches had been used in their creation. This was reinforced by examining the Granger Charts from the audit prints, which were a little ragged. The composite image shows the Granger Chart soft proofed, with both the Sihl profile and a bespoke one, made from 343 swatches. Even though this is less than our normal 728 swatch profile, the improvement in smoothness is quite apparent. Using an Epson 4800 as a test bed we obtained reasonable, but not outstanding, audit data using the Sihl profile and only a 20% improvement using a bespoke profile. As so often happens with papers laden with OBAs, the mapping of the profile drags the saturation of skin tones down towards the blue of the base paper.

The print from the Sihl profile was biased magenta about that which might be obtained from a selenium toning of a silver halide print. It was not unpleasant in the way a green-biased print would be, but was sufficiently out of whack for us to set about bespoke profiling straight away! The print made with the bespoke profile was a good, clean and bright rendering. The Dmax was mapped down slightly at 2.48 and the metamerism was low at 0.9 ΔE Lab (D65 to Tungsten A illuminants). We measured slightly higher gamut volumes off the bespoke profile than the Sihl profile and there might be a little more in hand with a high-resolution profile build. There was some evidence of bronzing in parts of the gamut.

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