OK, great, thanks Graeme. I was a bit puzzled as the results didn't seem to add up. As you are doing a new release, I don't suppose you would be able to add an option for the i1Pro2 to measure UV on / off for spotread? i1Profiler has this feature and it's very useful to get an estimate of how much FWA is in the paper (for example, with a particular paper the b* reading is -15 with UV and -4 without ... which gives a good indication of very high FWA content). [Also, by looking at the a* reading too it gives an idea of the extent of the color shift due to the FWA. In the case of this particular paper b* went from 3 with UV to 0.5 without, so quite a magenta tint caused by the UV]. As Argyll also allows spotread for a reflective measurement with the paper (illuminated by the lamp), this would allow three readings: spot white UV on and off, and reflected white. If the b* readings were, say, -15, -4 and -6 this would give a comparison between the UV content of the i1 (presumably a known value?) and the lamp, so that an estimate of the UV content of the illuminant could be worked out. Robert -----Original Message----- From: argyllcms-bounce@xxxxxxxxxxxxx [mailto:argyllcms-bounce@xxxxxxxxxxxxx] On Behalf Of Graeme Gill Sent: 10 December 2014 01:09 To: argyllcms@xxxxxxxxxxxxx Subject: [argyllcms] Re: FWA Compensation robert@xxxxxxxxxxxxxxxxxx wrote: Hi Robert, > test between the two. My problem is that I don't really know how to set up > this test, in particular how to know how much UV there is in my illuminant. > Perhaps there's an indirect way of estimating that (illumread clearly does > this, but I don't understand the plots enough to be able to say that > illumread indicates that this particular illuminant has high UV and this one > has low UV). Well, the answer is that "illumread -v" will indicate how much UV it thinks is in the illuminant, in rather arbitrary units. However, on checking exactly how this works, I'm distressed to discover that illumread has not actually been working since ArgyllCMS V1.4.0, when I re-factored some code to add support for M0/M1/M2 :-( :-( :-(. I've updated <http://www.argyllcms.com/disptools_win32_v1.7beta.zip> and also updated <http://www.argyllcms.com/Argyll_dev_src.zip> if you would like to test with a working illumread. Graeme Gill.