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Author Topic: DCamProf - a new camera profiling tool  (Read 767279 times)

AlterEgo

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Re: DCamProf - a new camera profiling tool
« Reply #720 on: August 18, 2015, 11:57:24 pm »

I have now released v0.9.3.
it seems that you didn't update the webpage @ http://www.ludd.ltu.se/~torger/dcamprof.html with the text matching to what is in the dcamprof.html from the distribution
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AlterEgo

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Re: DCamProf - a new camera profiling tool
« Reply #721 on: August 19, 2015, 12:03:13 am »

0.9.3 build for Windows (mingw = dcamprof.exe + libgomp_64-1.dll + HTML manual, no PDF this time) : https://app.box.com/s/74jijebztt5nupgypmvqzqq2i5p4i4yo
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torger

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Re: DCamProf - a new camera profiling tool
« Reply #722 on: August 19, 2015, 01:55:05 am »

it seems that you didn't update the webpage @ http://www.ludd.ltu.se/~torger/dcamprof.html with the text matching to what is in the dcamprof.html from the distribution

Just looked, it matches here. Could be that the there was some cached stuff showing?
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AlterEgo

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Re: DCamProf - a new camera profiling tool
« Reply #723 on: August 19, 2015, 02:21:26 am »

Just looked, it matches here. Could be that the there was some cached stuff showing?
may be - now it shows.
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Bip

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Re: DCamProf - a new camera profiling tool
« Reply #724 on: August 19, 2015, 03:48:04 am »

If you're asking how to make a tiff file that Argyll scanin can read, then you can't use Lightroom as it cannot export a linear tiff without white balancing.

What can be desirable though if you intend to use the finished profile in Lightroom is that you convert to DNG first, and then use RawTherapee or DCRaw to make the tiff for Argyll's scanin. Usually this is not necessary, but some raw formats contain calibration data which may be applied differently by Adobe's DNG converter and DCRaw/RawTherapee

Ok, thank you for the answer, I thought to do as you indicate.
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torger

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Re: DCamProf - a new camera profiling tool
« Reply #725 on: August 19, 2015, 12:08:36 pm »

What still may be left in terms of C1 support is gamut mapping.

Hmm... it's probably not gamut mapping I need, I just need to shape up the handling of those "undefined" areas of the RGB->Lab LUT, the current implementation doesn't do it good enough. It's still a difficult problem, but I have some new ideas to try. Until then the ICC profiles may have some issues with super-saturated colors.
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Alexey.Danilchenko

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Re: DCamProf - a new camera profiling tool
« Reply #726 on: August 20, 2015, 04:41:21 am »

I had extracted my ProBack spectras tonight and they are rubbish. The first attempt went astray so I will need to redo it. I'd need to correct a few things as well:
- I need to invent something to connect camera to integrating sphere more tightly to prevent even slightest leaks
...
Finally managed to get all the parts and get a more secure connection camera-to-integrating sphere. Did another run of taking readings for the cameras I have at 5nm steps. Results are below.

I used Kodak ProBack 645 and Kodak SLR/n. ProBack was used without IR filter (transmittance of several IR filters measured separately so usage of them can be simulated). Both cameras were used in the mode where they are taking dark shot aftre exposure ans subtract it to reduce the noise (SLR/n uses temperature weighted subtraction).

The SLR/n spectral responses are closely repeating the shape published in the sensor documentation but are more smooth. I managed to build very decent matrix profile with them in dcamprof using only CC24.

The ProBack spectral responses however did came out quite jagged at first but sampling different areas of raw file produced smoother spectra.

All the spectral data in the form of CSV files and JSON files (for dcamprof usage) could be downloaded here.

Spectral responses of Kodak SLR/n:



Spectral responses of Kodak ProBack 645 + Kodak IR filter:



Spectral responses of Kodak ProBack 645 + KnightOptics IR filter (it allows a bit more red but within Kodak IR filter specs):




« Last Edit: August 20, 2015, 07:53:38 pm by Alexey.Danilchenko »
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Bip

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Re: DCamProf - a new camera profiling tool
« Reply #727 on: August 22, 2015, 11:03:32 am »

Hi
After our exchanges, I tried to make a profile for Lr from a raw demosaiced with RT (Rawtherapee) by making a linear tif.
The dcp (or icc) profiles  give very good results with RT (very low delta E 2000)

With LR, dcp profile doesn't work well, there is a shift in the temperature color display and hue for the white balance, I tested dcp linear profile and with the TRC "ACR" without better results.

The command lines used:
scanin -v - G 1.0 -dipn target.tif target.ti3
dcamprof make-profile –i D55 (1) –I D50 (2) -b P11 (3) target.ti3 profil.json
dcamprof make-dcp -n "Nikon D700" -d "Profile name" –t acr profil.json profil.dcp

(1) The pattern is taken with flash
(2) The data of the test pattern are D50
(3) P11 is the most neutral patch (a and b values of L * a * b *) of the target

If you have any comments on the process ... thank you
Someone made profiles for Lr? (With what procedure)

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AlterEgo

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Re: DCamProf - a new camera profiling tool
« Reply #728 on: August 22, 2015, 11:25:23 am »

Nikon D700

dear, dear... you have SSF/CMF for the camera ( credit = https://www.nikonschool.it/experience/infrarosso-dslr4.php ) , why bother with targets ? this graph says that with IR-Cut filter (hence not removed)



and this will help you to digitize the graph http://arohatgi.info/WebPlotDigitizer/download.html

voila...

PS: or our friend Trantor created some already if you want just to use some = http://wowcamera.info/forum/viewtopic.php?t=967&start=40
« Last Edit: August 22, 2015, 11:30:39 am by AlterEgo »
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Bip

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Re: DCamProf - a new camera profiling tool
« Reply #729 on: August 22, 2015, 12:04:38 pm »

I tried with http://www.cis.rit.edu/jwgu/research/camspec/db.php (the link is broken today), there were the SSF data for D700.

The profile is lower than that achieved with a pattern, why? I'm not sure if it was the SSF data or the way I do, I have kept the SSF data and I would have time I will make a new test

For "Trantor's profil"  thank you, I look at
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AlterEgo

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Re: DCamProf - a new camera profiling tool
« Reply #730 on: August 22, 2015, 12:11:04 pm »

The profile is lower than that achieved with a pattern, why?
what "lower" means ? low contrast ? low saturation ?

PS: if you have a loss of contrast when shooting a target to get a raw file to use in profile creation then it is natural for a profiling software to compensate (based on target measurements, where it sees that contrast has to be higher)
« Last Edit: August 22, 2015, 12:21:44 pm by AlterEgo »
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AlterEgo

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Re: DCamProf - a new camera profiling tool
« Reply #731 on: August 22, 2015, 12:31:26 pm »

I tried with http://www.cis.rit.edu/jwgu/research/camspec/db.php (the link is broken today)
I think they simply removed the stuff, I had it saved

RED:

0.00177749581440642
       0.00274445751769572
        0.0487655203252541
        0.0556496138020373
        0.0398169097399976
        0.0313482706319957
        0.0266321977506102
        0.0281100251101365
        0.0324368880182042
        0.0298626577750321
        0.0316728595832234
        0.0383465440299556
        0.0621504452454818
        0.0753729257442601
        0.0394324854435398
        0.0219264580025719
        0.0252601293128276
        0.0953911590772382
         0.494608494836299
         0.743715011217136
         0.711720027647541
          0.61752326479373
         0.512359892198394
         0.411283156067318
         0.319804683055095
         0.242359166236931
         0.165468210996257
        0.0821160418097345
        0.0262800791741362
       0.00739375747881804
       0.00285676663650002
       0.00111688551607914
      0.000471281415204309

GREEN :

0.00143354304586119
       0.00187398911552759
        0.0230803142653007
        0.0433564348087553
        0.0599136084381471
        0.0823639826379627
         0.133560455257778
         0.244984139558533
         0.359608596552274
         0.409368145681599
         0.576987109214872
         0.766192716804414
         0.900613338014063
                         1
         0.954947098200156
         0.887281275289021
         0.747135409589881
         0.624904015610591
          0.45115151851569
         0.286898667071245
         0.144885824038473
        0.0650367429493248
        0.0319470263207801
        0.0194491179982937
         0.012242204930572
       0.00814265442363087
       0.00593576724862311
       0.00422657598707906
       0.00205652351596989
      0.000881204570773891
      0.000480143028493641
      0.000237596621203383
      0.000117563261068653

BLUE :

0.00591568345365685
        0.0143952300672906
         0.374546467413338
         0.652706391660757
         0.753092472546832
          0.90218044480169
         0.911669627000415
         0.867874807032218
         0.815767336811676
         0.644026296824005
         0.460406091187772
         0.277858930228507
         0.130722325247247
        0.0640848940275101
        0.0317483362505199
        0.0150751490571673
       0.00743144412683003
       0.00536619979974889
       0.00411640917428182
       0.00265646535288544
       0.00126895149591723
      0.000756851904319394
      0.000506425955964308
      0.000332196038026167
      0.000305303155847557
        0.0003917628185241
      0.000235394162743942
      0.000188476692220806
      0.0000804704363975458
      0.0000457342402698008
      0.0000345036366345881
      0.0000279619189396018
      0.0000246591433308175
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Bip

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Re: DCamProf - a new camera profiling tool
« Reply #732 on: August 22, 2015, 12:42:12 pm »

what "lower" means ? low contrast ? low saturation ?

PS: if you have a loss of contrast when shooting a target to get a raw file to use in profile creation then it is natural for a profiling software to compensate (based on target measurements, where it sees that contrast has to be higher)

Lower* : less good, less accurate profile.

*, sorry for my english...
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Bip

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Re: DCamProf - a new camera profiling tool
« Reply #733 on: August 22, 2015, 12:44:44 pm »

I think they simply removed the stuff, I had it saved

Me too (thank a lot)
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Bip

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Re: DCamProf - a new camera profiling tool
« Reply #734 on: August 22, 2015, 01:04:05 pm »

I tried with http://www.cis.rit.edu/jwgu/research/camspec/db.php (the link is broken today), there were the SSF data for D700.

The profile is lower than that achieved with a pattern, why? I'm not sure if it was the SSF data or the way I do, I have kept the SSF data and I would have time I will make a new test

For "Trantor's profil"  thank you, I look at

dcp Strantor's profiles do not work well with Lr, Lr has the same behavior with the profiles of Strantor and mine.
To make a good profile, it is essential to be able to generate the linear tiff (or dng) with the soft for which the profile is made.
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AlterEgo

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Re: DCamProf - a new camera profiling tool
« Reply #735 on: August 22, 2015, 01:06:48 pm »

Lower* : less good, less accurate profile.
and how do you test for "accuracy" ?
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AlterEgo

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Re: DCamProf - a new camera profiling tool
« Reply #736 on: August 22, 2015, 01:12:05 pm »

To make a good profile, it is essential to be able to generate the linear tiff (or dng) with the soft for which the profile is made.
that again begs the question - how do you test exactly ?

here is what I get when SSF/CMF approximated (for example, not the best approximation that I made) using the matlab script from RIT (so less precise than a quality measurement with monochromator setup) and dcp profile built based on that for ACR used for a shot (raw) of an individually measurement target (passport) vs the measurements :



is it precise enough to your eye ? the test is with babelcolor patchtool :



no mess with "essential to be able to generate the linear tiff (or dng) with the soft for which the profile is made" in ACR case for Sony A7 (mark I).

now when I am sure that I can get that close with the SSF/CMF I approximate with ACR settings specific for such comparison (process 2010, etc) then I can, if I want, go into some creative mode with extra features that DCamProf provides (but I don't - leaving all that for postprocessing in photoshop)
« Last Edit: August 22, 2015, 01:24:21 pm by AlterEgo »
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Iliah

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Re: DCamProf - a new camera profiling tool
« Reply #737 on: August 22, 2015, 02:21:16 pm »

« Last Edit: August 22, 2015, 02:37:50 pm by Iliah »
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Bip

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Re: DCamProf - a new camera profiling tool
« Reply #738 on: August 22, 2015, 03:44:10 pm »

Like you, with Patch tool and look at the gamuts and curves profiles Copra3.
The shape and the absence of breakage is also important that the volume.
I plan to go to Color Think.
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Bip

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Re: DCamProf - a new camera profiling tool
« Reply #739 on: August 22, 2015, 04:11:39 pm »

[...]

is it precise enough to your eye ?

[...]

Yes, it is really very good result.

I made a few icc profiles with SSF data D700, with a simulation of the color digital SG , but I have a doubt about the values of this target (in memory,  I took the values given on the website of Babelcolor). I kept all the files and I'll try on dcp profiles (I still work).

Thank you for your help.
« Last Edit: August 22, 2015, 04:13:25 pm by Bip »
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