Jacques Warnon wrote: > Our printing media (sublimated polyester) seems to wreak havoc on > colorimeters, especially in the highlights. It seems similar to the effect of > optical brightening agents, but much more pronounced. Jacques, if it is a fluorescence issue, then I would expect that a profile made from measurements with the i1 (no uv-filter) should be at least fine for viewing the print under a tungsten light source (since the i1 uses a tungsten lamp too). Is this the case? Do your prints generally change the perceived color significantly under different kinds of light sources? And if it is an UV-induced fluorescence issue, then I'd expect to see a clarly noticeable difference when comparing the shapes of the reflectance spectra of the substrate captured with the i1 with and w/o UV filter. But of course fluorescence does not need to be necessarily induced by UV, but can be also induced by any other wavelengths too [only FWAs are designed in particular to turn UV into visible light]. Btw, what exactly is the impact you are observing? How do you judge w/o any "good" reference measurements that your measurements are "bad"? Regards, Gerhard