[argyllcms] Re: Negative values in .ti3 spectral part
- From: Vallo Kallaste <kalts@xxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Wed, 19 Feb 2020 23:33:49 +0200
On Wed, Feb 19, 2020 at 10:35:03AM -0500, graxx@xxxxxxxxxxxx wrote:
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...
Format description tells that normalisation is applied to XYZ values:
http://argyllcms.com/doc/ti3_format.html
BTW, has anybody noticed that iPro2 results are skewed for some time
starting from cold? I mean, it was sitting on the monitor for all day,
but after ~10 minute pause between measurements the LUMINANCE_XYZ_CDM2
values behave like that. File count expresses progress in time in 2
minute steps. Guess it's not monitor drift as the behaviour is same in
different times on two different monitors.
Anyway, that's what piqued my interest and lead to original question as
I did some boxplotting and discovered negative values.
localhost$ sh do.sh |sort -rn -k2,2
114.112460 120.600001 117.209060 ipro2ref-1.ti3
113.508708 120.093934 117.633195 ipro2ref-2.ti3
113.189284 119.812530 117.988529 ipro2ref-3.ti3
112.953746 119.608758 118.150309 ipro2ref-4.ti3
112.775368 119.442982 118.326298 ipro2ref-5.ti3
112.672490 119.346599 118.456071 ipro2ref-6.ti3
112.582392 119.269293 118.480293 ipro2ref-7.ti3
112.556138 119.216055 118.635425 ipro2ref-8.ti3
112.461445 119.136101 118.647671 ipro2ref-9.ti3
112.383551 119.066547 118.684488 ipro2ref-10.ti3
112.361727 119.036274 118.745273 ipro2ref-11.ti3
112.353981 119.036248 118.773271 ipro2ref-12.ti3
112.358685 119.028693 118.786642 ipro2ref-13.ti3
112.349611 119.005359 118.831792 ipro2ref-14.ti3
112.328445 118.977969 118.850118 ipro2ref-15.ti3
112.294699 118.965383 118.802564 ipro2ref-16.ti3
112.295547 118.962275 118.853258 ipro2ref-17.ti3
112.275168 118.926917 118.905257 ipro2ref-19.ti3
112.255084 118.924196 118.918288 ipro2ref-21.ti3
112.268698 118.921471 118.868396 ipro2ref-18.ti3
112.271449 118.920494 118.907216 ipro2ref-23.ti3
112.256479 118.907076 118.867347 ipro2ref-22.ti3
112.239293 118.902754 118.856526 ipro2ref-20.ti3
112.241437 118.898198 118.908478 ipro2ref-25.ti3
112.235299 118.895314 118.935051 ipro2ref-24.ti3
localhost$ sh do.sh |sort -rn -k1,1
114.112460 120.600001 117.209060 ipro2ref-1.ti3
113.508708 120.093934 117.633195 ipro2ref-2.ti3
113.189284 119.812530 117.988529 ipro2ref-3.ti3
112.953746 119.608758 118.150309 ipro2ref-4.ti3
112.775368 119.442982 118.326298 ipro2ref-5.ti3
112.672490 119.346599 118.456071 ipro2ref-6.ti3
112.582392 119.269293 118.480293 ipro2ref-7.ti3
112.556138 119.216055 118.635425 ipro2ref-8.ti3
112.461445 119.136101 118.647671 ipro2ref-9.ti3
112.383551 119.066547 118.684488 ipro2ref-10.ti3
112.361727 119.036274 118.745273 ipro2ref-11.ti3
112.358685 119.028693 118.786642 ipro2ref-13.ti3
112.353981 119.036248 118.773271 ipro2ref-12.ti3
112.349611 119.005359 118.831792 ipro2ref-14.ti3
112.328445 118.977969 118.850118 ipro2ref-15.ti3
112.295547 118.962275 118.853258 ipro2ref-17.ti3
112.294699 118.965383 118.802564 ipro2ref-16.ti3
112.275168 118.926917 118.905257 ipro2ref-19.ti3
112.271449 118.920494 118.907216 ipro2ref-23.ti3
112.268698 118.921471 118.868396 ipro2ref-18.ti3
112.256479 118.907076 118.867347 ipro2ref-22.ti3
112.255084 118.924196 118.918288 ipro2ref-21.ti3
112.241437 118.898198 118.908478 ipro2ref-25.ti3
112.239293 118.902754 118.856526 ipro2ref-20.ti3
112.235299 118.895314 118.935051 ipro2ref-24.ti3
localhost$ sh do.sh |sort -rn -k3,3
112.235299 118.895314 118.935051 ipro2ref-24.ti3
112.255084 118.924196 118.918288 ipro2ref-21.ti3
112.241437 118.898198 118.908478 ipro2ref-25.ti3
112.271449 118.920494 118.907216 ipro2ref-23.ti3
112.275168 118.926917 118.905257 ipro2ref-19.ti3
112.268698 118.921471 118.868396 ipro2ref-18.ti3
112.256479 118.907076 118.867347 ipro2ref-22.ti3
112.239293 118.902754 118.856526 ipro2ref-20.ti3
112.295547 118.962275 118.853258 ipro2ref-17.ti3
112.328445 118.977969 118.850118 ipro2ref-15.ti3
112.349611 119.005359 118.831792 ipro2ref-14.ti3
112.294699 118.965383 118.802564 ipro2ref-16.ti3
112.358685 119.028693 118.786642 ipro2ref-13.ti3
112.353981 119.036248 118.773271 ipro2ref-12.ti3
112.361727 119.036274 118.745273 ipro2ref-11.ti3
112.383551 119.066547 118.684488 ipro2ref-10.ti3
112.461445 119.136101 118.647671 ipro2ref-9.ti3
112.556138 119.216055 118.635425 ipro2ref-8.ti3
112.582392 119.269293 118.480293 ipro2ref-7.ti3
112.672490 119.346599 118.456071 ipro2ref-6.ti3
112.775368 119.442982 118.326298 ipro2ref-5.ti3
112.953746 119.608758 118.150309 ipro2ref-4.ti3
113.189284 119.812530 117.988529 ipro2ref-3.ti3
113.508708 120.093934 117.633195 ipro2ref-2.ti3
114.112460 120.600001 117.209060 ipro2ref-1.ti3
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