Valo,
If NORMALIZED_TO_Y_100 "YES" then the data is not in any physical unit,
especially when it's coming from emissive device such as monitor. You can
consider the measurements as having been "normalized" to the monitor white.
There are more than one way to do this, I'm not sure which way does Graeme
do it...
/ Roger
-----Original Message-----
From: argyllcms-bounce@xxxxxxxxxxxxx <argyllcms-bounce@xxxxxxxxxxxxx> On
Behalf Of Vallo Kallaste
Sent: Wednesday, February 19, 2020 10:15 AM
To: argyllcms@xxxxxxxxxxxxx
Subject: [argyllcms] Negative values in .ti3 spectral part
Hi
Are negative values normal in the .ti3 file spectral part?
I have some .sp files measured by same iPro2 instrument and none of them
have negative values. The file format seems similar, but that is only guess
really. What the SPEC_XXX values mean? Sure, they signify intensity in that
particular slice of spectrum, but in what units?
CTI3
DESCRIPTOR "Argyll Calibration Target chart information 3"
ORIGINATOR "Argyll dispread"
CREATED "Tue Feb 18 22:33:21 2020"
DEVICE_CLASS "DISPLAY"
MULTI_DIM_STEPS "4"
COLOR_REP "RGB_XYZ"
TARGET_INSTRUMENT "X-Rite i1 Pro 2"
DISPLAY_TYPE_REFRESH "YES"
INSTRUMENT_TYPE_SPECTRAL "YES"
SPECTRAL_BANDS "109"
SPECTRAL_START_NM "370.000000"
SPECTRAL_END_NM "730.000000"
LUMINANCE_XYZ_CDM2 "112.268698 118.921471 118.868396"
NORMALIZED_TO_Y_100 "YES"
NUMBER_OF_FIELDS 116
BEGIN_DATA_FORMAT
SAMPLE_ID RGB_R RGB_G RGB_B XYZ_X XYZ_Y XYZ_Z SPEC_370 SPEC_373 SPEC_377
SPEC_380 SPEC_383 SPEC_387 SPEC_390 SPEC_393 SPEC_397 SPEC_400 SPEC_403
SPEC_407 SPEC_410 SPEC_413 SPEC_417 SPEC_420 SPEC_423 SPEC_427 SPEC_430
SPEC_433 SPEC_437 SPEC_440 SPEC_443 SPEC_447 SPEC_450 SPEC_453 SPEC_457
SPEC_460 SPEC_463 SPEC_467 SPEC_470 SPEC_473 SPEC_477 SPEC_480 SPEC_483
SPEC_487 SPEC_490 SPEC_493 SPEC_497 SPEC_500 SPEC_503 SPEC_507 SPEC_510
SPEC_513 SPEC_517 SPEC_520 SPEC_523 SPEC_527 SPEC_530 SPEC_533 SPEC_537
SPEC_540 SPEC_543 SPEC_547 SPEC_550 SPEC_553 SPEC_557 SPEC_560 SPEC_563
SPEC_567 SPEC_570 SPEC_573 SPEC_577 SPEC_580 SPEC_583 SPEC_587 SPEC_590
SPEC_593 SPEC_597 SPEC_600 SPEC_603 SPEC_607 SPEC_610 SPEC_613 SPEC_617
SPEC_620 SPEC_623 SPEC_627 SPEC_630 SPEC_633 SPEC_637 SPEC_640 SPEC_643
SPEC_647 SPEC_650 SPEC_653 SPEC_657 SPEC_660 SPEC_663 SPEC_667 SPEC_670
SPEC_673 SPEC_677 SPEC_680 SPEC_683 SPEC_687 SPEC_690 SPEC_693 SPEC_697
SPEC_700 SPEC_703 SPEC_707 SPEC_710 SPEC_713 SPEC_717 SPEC_720 SPEC_723
SPEC_727 SPEC_730 END_DATA_FORMAT
NUMBER_OF_SETS 38
BEGIN_DATA
1 100.0000 100.0000 100.0000 94.40574 100.0000 99.95537 0.0200741 0.00574726
-0.000818178 -0.000798747 0.00100280 0.00200295 0.00250698 0.00122570
0.00159040 0.00406793 0.00677735 0.00949811 0.0153155 0.0313478 0.0680208
0.137991 0.256779 0.468986 0.932691 1.658169 2.125808 2.038759 1.905101
1.989915 2.036036 1.992729 1.863442 1.661851 1.421894 1.181938 0.968885
0.798774 0.675235 0.593226 0.544542 0.528889 0.555219 0.642386 0.829491
1.163914 1.679929 2.347917 3.008239 3.453887 3.551374 3.314352 2.918821
2.494336 2.090204 1.735311 1.476694 1.590001 2.269647 2.525394 1.605680
0.621868 0.311722 0.223504 0.169357 0.132599 0.137621 0.268177 0.491584
0.533465 0.359646 0.261152 0.294122 0.337596 0.354138 0.376433 0.609675
1.539917 2.863455 3.087068 2.116958 1.489719 1.630211 2.020016 2.258456
2.099614 1.728105 1.572310 1.790075 2.448504 3.450307 4.467794 5.228953
5.273681 4.333473 2.970652 1.824047 1.081055 0.705529 0.547221 0.478487
0.435003 0.376759 0.299416 0.235059 0.227134 0.300823 0.403393 0.412807
0.293399 0.150817 0.0755976 0.0548892 0.0508767 0.0478463
2 66.66667 0.00000 100.0000 41.25722 16.42855 90.21849 0.00852286 0.00333022
-0.000103400 -0.000710030 0.00197926 0.00246220 0.00141657 0.00106760
0.00186012 0.00303593 0.00555727 0.00900644 0.0154709 0.0320803 0.0678834
0.136759 0.256128 0.468459 0.929881 1.652916 2.119719 2.033258 1.901790
1.988119 2.034410 1.991404 1.862207 1.659910 1.417659 1.170827 0.940329
0.736606 0.564109 0.427021 0.325472 0.256467 0.216761 0.200991 0.205783
0.229266 0.262906 0.290428 0.290289 0.253540 0.191429 0.127684 0.0797094
0.0494599 0.0314751 0.0208992 0.0149678 0.0127942 0.0143649 0.0149410
0.00947050 0.00332978 0.00165940 0.00130069 0.000831997 0.000604475
0.00184055 0.00841311 0.0200937 0.0276636 0.0304806 0.0420816 0.0646681
0.0878583 0.105702 0.126881 0.229247 0.607912 1.143564 1.239855 0.858555
0.613496 0.677306 0.840868 0.940433 0.876686 0.725201 0.662517 0.755290
1.033784 1.456621 1.886262 2.205373 2.220472 1.823608 1.251008 0.769227
0.457445 0.298292 0.230650 0.201108 0.180962 0.155350 0.122635 0.0960598
0.0923605 0.119862 0.159833 0.163047 0.116004 0.0588331 0.0285892 0.0209014
0.0174038 0.0155125
3 33.33333 100.0000 66.66667 33.45585 73.74368 50.14293 -0.00370387
0.00142732 -0.00140651 -0.000755306 -0.000297103 0.00200373 0.00192332
0.00121395 0.00144241 0.00203088 0.00317605 0.00380187 0.00608450 0.0142782
0.0319957 0.0639331 0.117801 0.215127 0.427101 0.756304 0.965961 0.923021
0.860911 0.898124 0.914445 0.890672 0.831170 0.740576 0.633596 0.528564
0.442103 0.383805 0.356364 0.351578 0.360279 0.382838 0.430950 0.527032
0.711793 1.032835 1.528629 2.180844 2.842329 3.309088 3.441078 3.239905
2.872517 2.465876 2.070767 1.722721 1.468738 1.584014 2.262916 2.519190
1.601822 0.620547 0.311344 0.223036 0.169097 0.131763 0.133629 0.251574
0.452188 0.478960 0.298658 0.175733 0.160032 0.152734 0.131910 0.111171
0.130228 0.267487 0.468122 0.487046 0.314787 0.198613 0.200041 0.238991
0.261049 0.239291 0.194866 0.174305 0.196699 0.267601 0.374947 0.484520
0.566982 0.571797 0.472210 0.327433 0.204286 0.124069 0.0837785 0.0684021
0.0623411 0.0586957 0.0522743 0.0435441 0.0381125 0.0393321 0.0532687
0.0721479 0.0755970 0.0568490 0.0319251 0.0198263 0.0185357 0.0206719
0.0205014
4 100.0000 0.00000 0.00000 57.85639 26.15325 0.801873 -0.00132701
-0.00179913 -0.00196535 -0.000693707 0.0000823038 0.000333716 -0.000296114
-0.000505440 -0.000331373 0.000196222 0.000279695 -0.000137233 8.55077e-07
0.000997677 0.00253873 0.00352794 0.00411486 0.00671960 0.0117840 0.0185003
0.0222710 0.0195387 0.0163679 0.0151571 0.0133727 0.0118272 0.0100728
0.00869167 0.00793254 0.00793344 0.00777175 0.00779389 0.00737581 0.00651939
0.00564711 0.00512882 0.00498154 0.00476654 0.00523691 0.00678500 0.00860501
0.0112865 0.0135843 0.0147538 0.0151951 0.0142446 0.0123417 0.0108175
0.00869986 0.00660871 0.00467523 0.00409537 0.00511810 0.00575123 0.00366728
0.00130437 0.000613491 0.000638513 0.000359549 0.000609353 0.00407792
0.0185937 0.0446098 0.0615879 0.0681352 0.0955090 0.148936 0.203840 0.245757
0.294404 0.534820 1.419876 2.673382 2.902823 2.012160 1.440779 1.594938
1.985599 2.226031 2.074368 1.709690 1.556760 1.774299 2.428508 3.422006
4.430479 5.182318 5.220169 4.283627 2.930788 1.794318 1.058379 0.685136
0.528137 0.459186 0.413102 0.352782 0.278272 0.215878 0.205384 0.272040
0.363620 0.369432 0.258883 0.128378 0.0599581 0.0405728 0.0337970 0.0264425
[...]
