[argyllcms] Re: 2$ white reflectance standard?
- From: Ben Goren <ben@xxxxxxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Wed, 17 Mar 2010 10:32:55 -0700
On 2010 Mar 10, at 3:51 PM, Ernst Dinkla wrote:
> I wouldn't mind if people send me measurements with the method I described
> above.
Ernst, I finally stumbled across my roll. It's on a red plastic core and
labeled:
PTFE THREAD SEAL TAPE
MIL SPEC T-27730A
1/2" x 520"
MADE IN MALAYSIA
I didn't have to cut the spool; it was easy enough to bend it out of the way.
There's at least a good 3/8" of tape on the roll, so I don't think there's much
chance of the red plastic influencing the readings. However, the i1 Pro's light
visibly leaks through the sides of the stacked tape, which probably *does*
alter the readings.
Attached are a half-dozen readings. Curiously, all have L* values over 100. I
don't recall seeing that happen with either my BabelColor Watch Your White
target or the Tyvek sample.
I think your theory has merit, but the practical application probably needs
work....
Cheers,
b&
Reading X Y Z L* a* b* 376.666667
380.000000 383.333333 386.666667 390.000000 393.333333
396.666667 400.000000 403.333333 406.666667 410.000000
413.333333 416.666667 420.000000 423.333333 426.666667
430.000000 433.333333 436.666667 440.000000 443.333333
446.666667 450.000000 453.333333 456.666667 460.000000
463.333333 466.666667 470.000000 473.333333 476.666667
480.000000 483.333333 486.666667 490.000000 493.333333
496.666667 500.000000 503.333333 506.666667 510.000000
513.333333 516.666667 520.000000 523.333333 526.666667
530.000000 533.333333 536.666667 540.000000 543.333333
546.666667 550.000000 553.333333 556.666667 560.000000
563.333333 566.666667 570.000000 573.333333 576.666667
580.000000 583.333333 586.666667 590.000000 593.333333
596.666667 600.000000 603.333333 606.666667 610.000000
613.333333 616.666667 620.000000 623.333333 626.666667
630.000000 633.333333 636.666667 640.000000 643.333333
646.666667 650.000000 653.333333 656.666667 660.000000
663.333333 666.666667 670.000000 673.333333 676.666667
680.000000 683.333333 686.666667 690.000000 693.333333
696.666667 700.000000 703.333333 706.666667 710.000000
713.333333 716.666667 720.000000 723.333333 726.666667
730.000000 733.333333 736.666667 740.000000 743.333333
746.666667 750.000000
1 97.031646 100.706069 83.176618 100.272373
-0.118991 -0.083768 97.956 98.644 99.286
99.822 100.205 100.365 100.445 100.484
100.508 100.617 100.692 100.729 100.721
100.738 100.780 100.805 100.811 100.812
100.795 100.748 100.727 100.723 100.759
100.822 100.846 100.873 100.862 100.837
100.821 100.802 100.792 100.804 100.850
100.882 100.902 100.884 100.831 100.797
100.792 100.807 100.867 100.986 101.076
101.070 100.958 100.831 100.744 100.755
100.852 100.881 100.851 100.773 100.680
100.556 100.474 100.457 100.531 100.632
100.693 100.689 100.663 100.626 100.660
100.743 100.798 100.771 100.672 100.617
100.607 100.655 100.692 100.705 100.695
100.625 100.524 100.417 100.326 100.270
100.275 100.265 100.192 100.177 100.410
100.737 100.757 100.459 100.246 100.182
100.183 100.214 100.191 100.146 100.084
100.047 100.048 100.036 99.983 99.968
100.038 100.120 100.103 99.997 99.888
99.843 99.930 100.021 100.035 99.989
99.727 99.174 98.498 98.052 98.260
2 97.814669 101.529339 83.908493 100.588355
-0.136791 -0.125481 99.236 99.565 100.128
100.625 100.971 101.094 101.148 101.193
101.247 101.372 101.461 101.496 101.497
101.540 101.622 101.696 101.719 101.702
101.663 101.578 101.542 101.584 101.671
101.719 101.725 101.758 101.763 101.748
101.764 101.786 101.769 101.767 101.758
101.757 101.783 101.754 101.672 101.642
101.677 101.708 101.774 101.926 102.028
101.976 101.781 101.582 101.490 101.551
101.691 101.740 101.707 101.637 101.564
101.433 101.316 101.275 101.336 101.416
101.452 101.433 101.417 101.393 101.420
101.484 101.558 101.551 101.466 101.429
101.451 101.525 101.579 101.583 101.555
101.472 101.349 101.217 101.092 101.020
101.012 101.019 100.951 100.914 101.139
101.474 101.476 101.146 100.919 100.882
100.917 100.956 100.938 100.887 100.810
100.773 100.782 100.777 100.747 100.769
100.884 100.979 100.952 100.811 100.671
100.662 100.822 100.948 100.942 100.801
100.343 99.430 98.310 97.559 97.718
3 100.815620 104.657791 86.855774 101.773752
-0.160061 -0.409656 103.768 103.776 104.283
104.729 105.000 105.068 105.085 105.099
105.132 105.235 105.315 105.356 105.321
105.358 105.470 105.547 105.522 105.446
105.358 105.216 105.134 105.185 105.285
105.316 105.294 105.299 105.277 105.251
105.270 105.296 105.270 105.214 105.143
105.119 105.147 105.102 104.980 104.939
104.985 105.015 105.088 105.270 105.388
105.304 105.035 104.765 104.626 104.714
104.886 104.941 104.888 104.802 104.709
104.549 104.393 104.327 104.381 104.446
104.474 104.456 104.442 104.433 104.466
104.546 104.635 104.633 104.538 104.493
104.532 104.622 104.677 104.664 104.621
104.503 104.358 104.195 104.030 103.917
103.892 103.883 103.788 103.728 103.942
104.269 104.246 103.865 103.620 103.594
103.653 103.720 103.704 103.646 103.566
103.503 103.482 103.478 103.457 103.499
103.644 103.766 103.709 103.496 103.345
103.371 103.601 103.780 103.750 103.485
102.760 101.393 99.754 98.598 98.655
4 100.360750 104.136143 86.169595 101.577752
-0.079626 -0.210356 102.705 102.643 103.147
103.614 103.883 103.965 104.016 104.052
104.106 104.258 104.342 104.393 104.355
104.407 104.530 104.632 104.629 104.560
104.478 104.334 104.256 104.298 104.413
104.463 104.456 104.474 104.461 104.447
104.479 104.514 104.509 104.468 104.390
104.360 104.407 104.383 104.266 104.226
104.287 104.336 104.430 104.636 104.765
104.676 104.413 104.146 104.003 104.089
104.292 104.347 104.296 104.221 104.139
103.991 103.857 103.805 103.858 103.934
103.982 103.973 103.960 103.962 104.017
104.111 104.207 104.212 104.119 104.101
104.154 104.269 104.339 104.348 104.300
104.196 104.057 103.896 103.727 103.606
103.593 103.591 103.487 103.430 103.653
103.982 103.962 103.599 103.357 103.336
103.408 103.472 103.456 103.412 103.341
103.277 103.257 103.258 103.250 103.312
103.476 103.601 103.557 103.363 103.199
103.220 103.450 103.652 103.641 103.397
102.626 101.172 99.446 98.225 98.280
5 103.498425 107.452308 89.528600 102.812802
-0.176510 -0.684255 107.948 107.380 107.788
108.202 108.420 108.411 108.399 108.419
108.454 108.599 108.677 108.759 108.711
108.743 108.878 109.006 108.978 108.854
108.734 108.517 108.366 108.411 108.560
108.576 108.513 108.510 108.478 108.451
108.493 108.539 108.515 108.408 108.246
108.153 108.178 108.137 107.968 107.910
107.976 108.022 108.111 108.338 108.488
108.343 107.963 107.577 107.367 107.477
107.714 107.788 107.723 107.634 107.539
107.357 107.167 107.071 107.094 107.140
107.150 107.105 107.085 107.081 107.119
107.194 107.304 107.320 107.244 107.214
107.286 107.425 107.512 107.502 107.432
107.295 107.120 106.906 106.657 106.490
106.455 106.455 106.333 106.221 106.415
106.741 106.703 106.286 106.001 105.985
106.091 106.174 106.151 106.083 106.000
105.924 105.881 105.873 105.865 105.943
106.137 106.302 106.237 105.973 105.755
105.784 106.118 106.378 106.333 105.933
104.849 102.863 100.434 98.624 98.473
6 98.750630 102.435086 84.436382 100.934026
-0.029396 0.049576 100.105 100.158 100.695
101.175 101.494 101.596 101.654 101.707
101.763 101.912 101.999 102.074 102.082
102.135 102.251 102.360 102.375 102.336
102.292 102.173 102.102 102.149 102.265
102.344 102.361 102.391 102.394 102.399
102.444 102.488 102.490 102.458 102.418
102.408 102.462 102.440 102.340 102.317
102.383 102.440 102.533 102.728 102.866
102.807 102.581 102.355 102.235 102.330
102.526 102.594 102.565 102.511 102.434
102.300 102.174 102.123 102.198 102.292
102.339 102.340 102.343 102.355 102.408
102.494 102.597 102.619 102.541 102.514
102.556 102.663 102.731 102.734 102.715
102.628 102.505 102.372 102.220 102.106
102.098 102.119 102.045 101.989 102.215
102.561 102.560 102.204 101.974 101.968
102.034 102.094 102.109 102.076 102.002
101.959 101.954 101.959 101.951 101.998
102.142 102.275 102.241 102.063 101.900
101.927 102.160 102.343 102.332 102.106
101.417 100.116 98.550 97.438 97.473
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