Hi Andrew, thanks for reply. Not different LAB values, I mean upstream of those, actual different spectral readings in each nm-band (I've no idea what units they use in the file, whatever spectral density is measured in I guess).
Anyhow good to know that they should be the same. Sort of realized that after, I mean the whole point of being able to take spot measurements would be to get an accurate measurement regardless of which software was used with the device. Should be no reason for any particular software to mess with the spectral measurements.
Your question would involve diving into that month-deep rabbit hole that I doubt anyone wants to... In brief it started as testing the built-in spectros in 2 different HP Z-series printers to assess whether one of them was failing or not. Unfortunately because of software differences between the 2 printer models, I ended up at this point. In a thread over in Printing I described how I haven't been able to get them to use identical targets, one insists on arranging the patches slightly differently, so I'm stuck for the moment with scanning 2 different printed targets instead of one. It *shouldn't* be a problem -- same colour patches, same paper, same printer -- however it's beginning to smell a lot like what you've alluded to: the 2 printed targets don't have the same colours. I mean I've checked it 8 ways from Sunday and Argyll colverify still gives the dE's above. 4-12 is massive so I should be able to spot the differences if that's the case. The investigation continues tomorrow...
Thanks again, cheers