[argyllcms] Re: Using an i1 to measure FWA content?
- From: Martin Weberg <martin.weberg@xxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Tue, 9 Feb 2010 08:56:11 +0100
2010/2/8 Graeme Gill <graeme@xxxxxxxxxxxxx>:
> Probably the spectrum of the paper measured without the UV filter
> will be enough.
Attached are the three no filter replicates of paper 2.
>> readings contain no UV (10-400nm) I thought it was interesting that
>> the Spectrolino fitted with UV filter produced higher reflectance then
>> without filter below 420nm.
> 1) There is something different about the instrument calibration
> for UV vs. no UV filter. Measuring the calibration tile may
> reveal whether this is the case.
The readings are different. See attached.
> 2) There's some level of up-conversion fluorescence, or similar
> going on. If it really is up-conversion fluorescence then this
> would be difficult to model, since it is typically non-linear
> (two-photon absorption),
Please, explain up-conversion fluorescence, I do not follow.
> The "or similar" would have to be something like the high level
> of illumination at the fluorescent emission wavelengths suppressing
> absorption at shorter wavelengths. Fluorescence saturation
> may behave like this, but it is also non-linear and typically
> only happens at very high illumination levels.
If we only had a ~420+nm filter it could be tested.
Martin Weberg
Reading X Y Z L* a* b* 380.000000
390.000000 400.000000 410.000000 420.000000 430.000000
440.000000 450.000000 460.000000 470.000000 480.000000
490.000000 500.000000 510.000000 520.000000 530.000000
540.000000 550.000000 560.000000 570.000000 580.000000
590.000000 600.000000 610.000000 620.000000 630.000000
640.000000 650.000000 660.000000 670.000000 680.000000
690.000000 700.000000 710.000000 720.000000 730.000000
4 87.164719 89.747849 82.192879 95.892078
1.167295 -6.842209 11.844 17.621 36.765
78.351 102.405 108.104 106.555 101.549
98.851 97.109 95.090 94.027 93.044
92.229 91.479 90.652 89.972 89.252
88.402 88.226 88.077 88.069 88.108
88.247 88.596 88.987 89.704 90.673
91.531 92.335 93.058 93.763 94.536
94.977 95.411 95.646
5 87.161674 89.745392 82.206177 95.891057
1.166067 -6.854742 11.852 17.716 36.904
78.369 102.306 108.115 106.506 101.582
98.901 97.155 95.126 94.047 93.068
92.245 91.463 90.666 89.983 89.253
88.375 88.208 88.064 88.044 88.101
88.255 88.611 88.989 89.701 90.669
91.521 92.339 93.050 93.755 94.528
94.946 95.429 95.701
6 87.078087 89.648735 82.083031 95.850873
1.184680 -6.824221 11.800 17.399 36.431
78.209 102.395 108.063 106.425 101.382
98.697 96.964 94.930 93.885 92.903
92.112 91.350 90.557 89.864 89.146
88.305 88.129 87.996 87.974 88.035
88.179 88.525 88.919 89.612 90.605
91.454 92.264 92.972 93.707 94.465
94.905 95.378 95.646
Reading X Y Z L* a* b* 380.000000
390.000000 400.000000 410.000000 420.000000 430.000000
440.000000 450.000000 460.000000 470.000000 480.000000
490.000000 500.000000 510.000000 520.000000 530.000000
540.000000 550.000000 560.000000 570.000000 580.000000
590.000000 600.000000 610.000000 620.000000 630.000000
640.000000 650.000000 660.000000 670.000000 680.000000
690.000000 700.000000 710.000000 720.000000 730.000000
1 86.022270 89.605774 72.619331 95.833003
-0.699573 1.133974 71.098 77.414 81.082
84.140 85.636 86.898 87.136 87.813
88.529 89.010 89.130 89.547 89.648
89.782 89.881 89.895 89.937 89.871
89.551 89.609 89.391 89.362 89.408
89.403 89.411 89.339 89.381 89.525
89.582 89.727 89.687 89.676 89.857
89.805 89.805 89.947
Reading X Y Z L* a* b* 380.000000
390.000000 400.000000 410.000000 420.000000 430.000000
440.000000 450.000000 460.000000 470.000000 480.000000
490.000000 500.000000 510.000000 520.000000 530.000000
540.000000 550.000000 560.000000 570.000000 580.000000
590.000000 600.000000 610.000000 620.000000 630.000000
640.000000 650.000000 660.000000 670.000000 680.000000
690.000000 700.000000 710.000000 720.000000 730.000000
1 86.029984 89.610382 72.629021 95.834920
-0.693450 1.128754 82.452 82.787 83.457
84.126 85.466 86.835 87.250 87.789
88.497 89.014 89.159 89.555 89.625
89.787 89.912 89.896 89.918 89.863
89.583 89.624 89.374 89.348 89.431
89.400 89.435 89.342 89.402 89.564
89.610 89.706 89.645 89.713 89.923
89.849 89.878 90.050
2 85.404844 89.509334 69.267010 95.792868
-1.680950 4.060890 71.307 77.606 81.900
85.393 85.453 86.593 87.286 87.768
88.102 88.354 88.606 88.828 89.045
89.293 89.505 89.742 89.846 89.818
89.621 89.599 89.431 89.408 89.461
89.460 89.452 89.352 89.414 89.574
89.636 89.773 89.729 89.718 89.893
89.838 89.942 89.988
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