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Author Topic: DCamProf - a new camera profiling tool  (Read 447729 times)

scyth

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Re: DCamProf - a new camera profiling tool
« Reply #1520 on: March 13, 2017, 07:44:41 PM »

and the 2nd page from Passport, done the same way

Quote
CGATS.17
DESCRIPTOR   "X-Rite Passport S/N 008784, Creative Page, 3 passes/averaged, 380nm : 10.0nm : 730nm, with i1Pro2"
ORIGINATOR   "BabelColor PatchTool, version 5.1.0 b409"
LGOROWLENGTH   1
CREATED   "2017-03-13"  # Time: 19:40:26
INSTRUMENTATION   "i1Pro2, S/N 1044184, with 'Lamp Restore' before each pass"
MEASUREMENT_SOURCE   "Illumination=D50 ObserverAngle=2 WhiteBase=Abs Filter=No"
ILLUMINATION_NAME   "D50"
OBSERVER_ANGLE   "2"
FILTER   "Unknown"
MEASUREMENT_CONDITION   "M0"
WEIGHTING_FUNCTION   "ILLUMINANT, D50"
WEIGHTING_FUNCTION   "OBSERVER, 2 degree"
KEYWORD   "DEVCALSTD"
DEVCALSTD   "XRGA"
#
KEYWORD   "SAMPLE_ID"
NUMBER_OF_FIELDS   42
BEGIN_DATA_FORMAT
SAMPLE_ID   LAB_L   LAB_A   LAB_B   LAB_C   LAB_H   nm380   nm390   nm400   nm410   nm420   nm430   nm440   nm450   nm460   nm470   nm480   nm490   nm500   nm510   nm520   nm530   nm540   nm550   nm560   nm570   nm580   nm590   nm600   nm610   nm620   nm630   nm640   nm650   nm660   nm670   nm680   nm690   nm700   nm710   nm720   nm730
END_DATA_FORMAT
NUMBER_OF_SETS   26
BEGIN_DATA
1   96.5548   -0.6254   4.1612   4.21   98.5   0.140893   0.225553   0.400790   0.629710   0.780420   0.827160   0.843943   0.857770   0.870197   0.878327   0.885030   0.892020   0.897290   0.901187   0.905963   0.909493   0.912897   0.915233   0.915487   0.919813   0.919753   0.920713   0.920937   0.921637   0.922083   0.921763   0.922767   0.924107   0.925520   0.924523   0.923483   0.922283   0.923963   0.924817   0.923673   0.925643
2   88.7632   -0.6293   0.9117   1.11   124.6   0.138153   0.221877   0.387210   0.583320   0.688640   0.713667   0.722277   0.729750   0.734867   0.736927   0.738467   0.740817   0.742053   0.741683   0.740830   0.739413   0.738887   0.737473   0.733510   0.733700   0.733463   0.734903   0.734360   0.733423   0.733473   0.735103   0.739147   0.743440   0.745827   0.743723   0.741073   0.739050   0.741080   0.743920   0.745370   0.749690
3   81.0773   -0.5659   0.8842   1.05   122.6   0.133160   0.212320   0.354053   0.495790   0.557083   0.570573   0.577293   0.582387   0.583610   0.581687   0.579873   0.580333   0.581670   0.582653   0.584593   0.586517   0.588217   0.588847   0.588153   0.590280   0.589333   0.588330   0.586213   0.584343   0.582133   0.579523   0.577593   0.576377   0.575013   0.572120   0.569307   0.566713   0.566063   0.564730   0.561900   0.561367
4   73.7462   -0.5054   0.7985   0.95   122.3   0.129003   0.199843   0.312950   0.407713   0.441440   0.450047   0.456157   0.460960   0.461527   0.458937   0.456710   0.456827   0.457887   0.459050   0.461120   0.463167   0.464643   0.465407   0.465287   0.467337   0.466950   0.466203   0.464130   0.462050   0.459477   0.456467   0.454120   0.452260   0.450360   0.447200   0.444087   0.441030   0.439897   0.438040   0.435013   0.433627
5   27.6753   -0.8456   -0.1391   0.86   189.3   0.043153   0.048493   0.050943   0.051857   0.052487   0.053103   0.053987   0.054217   0.054147   0.053513   0.053217   0.053240   0.053537   0.053690   0.054100   0.054333   0.054440   0.054283   0.053910   0.053677   0.053183   0.052760   0.052317   0.051920   0.051570   0.051183   0.050873   0.050693   0.050350   0.050063   0.049707   0.049447   0.049433   0.049293   0.049097   0.048990
6   25.5330   -0.7520   -0.5673   0.94   217.0   0.040580   0.043570   0.045467   0.045857   0.046300   0.046877   0.047297   0.047533   0.047323   0.046807   0.046510   0.046423   0.046523   0.046563   0.046683   0.046783   0.046813   0.046557   0.046183   0.046040   0.045570   0.045123   0.044807   0.044543   0.044257   0.043977   0.043787   0.043720   0.043543   0.043330   0.043067   0.042900   0.043013   0.042883   0.042543   0.042583
7   22.2771   -0.3065   -0.6362   0.71   244.3   0.035103   0.036960   0.036780   0.036957   0.036640   0.036987   0.037147   0.037297   0.037197   0.036873   0.036630   0.036607   0.036473   0.036363   0.036313   0.036277   0.036270   0.036163   0.035953   0.035950   0.035733   0.035507   0.035353   0.035253   0.035227   0.035103   0.034970   0.035103   0.035077   0.035020   0.035003   0.034950   0.034993   0.034947   0.035003   0.035030
8   20.2239   0.0599   -0.4889   0.49   277.0   0.028710   0.030307   0.031663   0.031533   0.031547   0.031460   0.031423   0.031330   0.031147   0.030963   0.030863   0.030743   0.030817   0.030667   0.030530   0.030450   0.030480   0.030443   0.030403   0.030460   0.030307   0.030270   0.030283   0.030317   0.030310   0.030387   0.030380   0.030470   0.030600   0.030597   0.030673   0.030573   0.030707   0.030793   0.030783   0.030913
9   80.8678   -5.4030   -6.2711   8.28   229.3   0.125737   0.212553   0.373297   0.546197   0.628037   0.645490   0.651177   0.656050   0.659020   0.658587   0.657203   0.656237   0.653950   0.648917   0.641793   0.631237   0.617293   0.597647   0.572253   0.551583   0.537667   0.530687   0.523400   0.519233   0.523327   0.535300   0.549910   0.561430   0.566267   0.560540   0.549517   0.540280   0.540987   0.547300   0.554517   0.565230
10   80.9682   -2.9907   -2.8847   4.16   224.0   0.128373   0.212130   0.368620   0.531633   0.603577   0.615483   0.617833   0.619973   0.620633   0.619030   0.617050   0.616070   0.614403   0.611140   0.607447   0.602950   0.598113   0.592200   0.584743   0.580480   0.574447   0.568463   0.558913   0.549947   0.545380   0.543273   0.544277   0.549830   0.557403   0.558687   0.553730   0.545010   0.534563   0.526840   0.530740   0.551910
11   80.6218   -0.1689   1.2925   1.30   97.4   0.118163   0.201253   0.348007   0.487813   0.545233   0.557353   0.562510   0.567110   0.570237   0.571017   0.571493   0.572820   0.573993   0.574127   0.574850   0.576023   0.577430   0.578273   0.578030   0.580567   0.580413   0.580700   0.580337   0.580230   0.579737   0.578877   0.578857   0.579383   0.579767   0.578470   0.577323   0.576047   0.577000   0.577503   0.576320   0.577000
12   81.2019   4.8042   0.8064   4.87   9.5   0.125867   0.207260   0.351230   0.488433   0.547203   0.565000   0.578197   0.588250   0.591710   0.589627   0.586403   0.584523   0.582863   0.578857   0.572470   0.567437   0.566213   0.563120   0.554403   0.558877   0.591153   0.625873   0.640160   0.643973   0.643943   0.642840   0.642967   0.643850   0.644067   0.642253   0.640803   0.639340   0.640043   0.640040   0.638387   0.638900
13   80.7173   6.5494   0.6135   6.58   5.4   0.127173   0.207947   0.349687   0.483917   0.540930   0.558237   0.572083   0.582710   0.586010   0.582897   0.578583   0.575737   0.572753   0.566893   0.559743   0.555757   0.553707   0.545927   0.532197   0.535637   0.578737   0.628100   0.649237   0.654977   0.655563   0.654327   0.653600   0.653360   0.653013   0.650897   0.648930   0.647060   0.647447   0.647327   0.645220   0.645590
14   81.2981   -10.5471   -4.5884   11.50   203.5   0.124530   0.209933   0.366283   0.525637   0.596030   0.614210   0.625327   0.636833   0.647897   0.658067   0.666973   0.674473   0.678147   0.676597   0.670213   0.658327   0.642257   0.620413   0.592480   0.567587   0.545037   0.527690   0.509217   0.494310   0.487327   0.485087   0.487057   0.496143   0.508840   0.513320   0.507320   0.495187   0.479303   0.467073   0.473140   0.505050
15   80.7653   -7.4942   -2.7829   7.99   200.4   0.123130   0.206823   0.357753   0.509577   0.577527   0.593943   0.602287   0.610800   0.618520   0.623520   0.626127   0.628187   0.628557   0.626650   0.624080   0.619983   0.614483   0.605733   0.592600   0.579683   0.563243   0.546023   0.526170   0.509730   0.499980   0.494953   0.492777   0.493933   0.498833   0.504060   0.508190   0.509790   0.508950   0.505850   0.505413   0.514730
16   81.1494   -5.4864   -1.4474   5.67   194.8   0.120073   0.203480   0.354580   0.505583   0.572237   0.588510   0.596273   0.603750   0.610570   0.614913   0.617163   0.619310   0.620063   0.618823   0.617547   0.615227   0.611813   0.606267   0.597050   0.588657   0.576640   0.564033   0.548850   0.536123   0.528543   0.524550   0.523080   0.524407   0.528527   0.532457   0.535673   0.537017   0.537013   0.535163   0.534617   0.541990
17   82.0943   -2.7244   -0.0614   2.73   181.3   0.121517   0.204463   0.357043   0.511110   0.579413   0.594537   0.600833   0.607150   0.612300   0.615047   0.616737   0.618923   0.619987   0.619523   0.619010   0.617740   0.616400   0.613863   0.608850   0.605740   0.599673   0.594020   0.586930   0.580867   0.577263   0.575207   0.574807   0.576307   0.578857   0.579453   0.579473   0.578277   0.577530   0.575987   0.575700   0.581363
18   81.2087   -0.1052   1.5835   1.59   93.8   0.117147   0.198437   0.345563   0.488353   0.548757   0.562637   0.568443   0.574167   0.578530   0.579827   0.580763   0.582697   0.583963   0.584163   0.585027   0.585990   0.587157   0.588147   0.588180   0.591060   0.591343   0.592000   0.591860   0.592130   0.592007   0.591490   0.591773   0.592673   0.593410   0.592447   0.591590   0.590737   0.592043   0.592627   0.591817   0.592913
19   51.5034   54.5887   -2.4594   54.64   357.4   0.108013   0.158267   0.220920   0.255583   0.260867   0.254707   0.242003   0.226783   0.209163   0.190540   0.170360   0.150557   0.135547   0.122053   0.104257   0.089443   0.085727   0.089313   0.091203   0.097897   0.127927   0.198047   0.305997   0.435530   0.570467   0.687390   0.771393   0.822300   0.849733   0.862910   0.870203   0.874870   0.881623   0.887117   0.889517   0.894133
20   50.6334   28.7382   -29.0639   40.87   314.7   0.109620   0.185790   0.306527   0.404990   0.442903   0.446720   0.433840   0.410857   0.379873   0.344223   0.303430   0.260653   0.225987   0.195877   0.162223   0.136717   0.129777   0.132890   0.131807   0.137367   0.165387   0.213693   0.257573   0.273440   0.266527   0.270040   0.304143   0.366463   0.442797   0.513293   0.564877   0.604030   0.640677   0.673493   0.700223   0.726263
21   50.6650   -3.7311   -50.6936   50.83   265.8   0.097310   0.166700   0.284490   0.401947   0.468600   0.515773   0.569447   0.619413   0.636747   0.620427   0.577037   0.510810   0.438137   0.365617   0.293263   0.236050   0.195940   0.161290   0.130487   0.111327   0.103667   0.101463   0.098623   0.096377   0.098847   0.108580   0.124727   0.142693   0.155053   0.153797   0.140803   0.129527   0.129707   0.138733   0.152733   0.173857
22   60.9219   -29.3765   -27.6237   40.32   223.2   0.100430   0.163507   0.252987   0.327893   0.368377   0.399527   0.437150   0.486507   0.546597   0.605157   0.637683   0.641770   0.618013   0.568740   0.499220   0.421757   0.347423   0.279397   0.222913   0.186077   0.166210   0.153860   0.141773   0.133243   0.132477   0.138590   0.147347   0.155340   0.161937   0.164907   0.162423   0.159083   0.161860   0.168967   0.176777   0.189640
23   61.0045   -61.3012   28.8176   67.74   154.8   0.052780   0.061547   0.066247   0.069703   0.072353   0.076060   0.081903   0.092090   0.110827   0.145473   0.200163   0.280353   0.383980   0.489203   0.542017   0.523047   0.461950   0.381563   0.301170   0.233427   0.177403   0.133077   0.101747   0.084890   0.077660   0.074713   0.073370   0.073120   0.075430   0.080757   0.088027   0.095370   0.100873   0.102103   0.100827   0.104087
24   86.4316   3.0124   86.1147   86.17   88.0   0.051887   0.053957   0.056090   0.057220   0.057930   0.059423   0.062730   0.068073   0.076963   0.091503   0.110143   0.131623   0.163533   0.246240   0.428117   0.629850   0.750763   0.803923   0.823930   0.834123   0.832913   0.825750   0.812447   0.800790   0.794800   0.792840   0.793887   0.797030   0.804267   0.814207   0.825233   0.834313   0.842753   0.846837   0.846020   0.849807
25   73.6552   35.9368   68.7293   77.56   62.4   0.059320   0.065073   0.069820   0.071130   0.071143   0.071290   0.072207   0.073917   0.075410   0.076567   0.077763   0.080587   0.090060   0.123823   0.189577   0.248023   0.284807   0.326137   0.403140   0.528787   0.661220   0.754607   0.802203   0.823770   0.833443   0.837840   0.841633   0.844973   0.847730   0.847823   0.848173   0.848247   0.851023   0.852930   0.852340   0.854683
26   52.0205   56.8288   29.8147   64.18   27.7   0.069217   0.079083   0.085970   0.087753   0.087043   0.086137   0.085653   0.085167   0.084113   0.082347   0.080493   0.078767   0.077173   0.075023   0.073073   0.073013   0.074583   0.077890   0.083693   0.098093   0.147960   0.260060   0.411763   0.555000   0.656257   0.712493   0.742663   0.761870   0.777110   0.789480   0.802077   0.814607   0.828890   0.840980   0.848977   0.857423
END_DATA

consistency (worst off measurement vs averaged one) :

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torger

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Re: DCamProf - a new camera profiling tool
« Reply #1521 on: March 14, 2017, 03:26:50 AM »

Thank you very much. Actually I'm not that worried about having the "perfect measurement" for these, because as can be seen in BabelColor's multi-measurements there are quite significant variations between colorcheckers even if made in the same time period. If one wants perfect there's no way around measuring one's own copy, and then it's probably better to use a larger target like the colorchecker classic as the larger patches are easier to measure.
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jrp

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Re: DCamProf - a new camera profiling tool
« Reply #1522 on: March 19, 2017, 11:08:01 AM »

I've just noticed that DXOmark publishes colour response data "Sensitivity metamerism index", "White balance scales" and colour matrix (ISO 17321), for daylight and tungsten.

https://www.dxomark.com/About/In-depth-measurements/Measurements/Color-sensitivity

Example: https://www.dxomark.com/Cameras/Leica/SL-Typ-601---Measurements

Are these measurements of any use with DCamProf or do they do nothing much more than replicate the embedded profiles in DNG raws?
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Jack Hogan

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Re: DCamProf - a new camera profiling tool
« Reply #1523 on: March 19, 2017, 12:40:04 PM »

I've just noticed that DXOmark publishes colour response data "Sensitivity metamerism index", "White balance scales" and colour matrix (ISO 17321), for daylight and tungsten.

Are these measurements of any use with DCamProf or do they do nothing much more than replicate the embedded profiles in DNG raws?

Not particularly useful imho, that's why they do not promote the Color Response tab.  Deriving the white balanced raw to sRGB matrices may yield some insights but I do not believe it does anything for DCamProf other than provide a reference.  More on how those matrices are obtained here.

Jack
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jrp

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Re: DCamProf - a new camera profiling tool
« Reply #1524 on: March 19, 2017, 12:55:20 PM »

Shame. I was hoping to avoid some of the tedious bits of camera calibration.
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torger

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Re: DCamProf - a new camera profiling tool
« Reply #1525 on: March 20, 2017, 05:18:54 AM »

I haven't personally thought about those numbers, if I remember correctly someone in the RawTherapee project derived color matrices from them, but I'm not sure.

I don't think they have any relation to the DNG raw color matrices, but they are the result of actual measurements they do according to some standard protocol. DCamProf can also derive matrices from measurements so it wouldn't be a help to DCamProf but rather a replacement :).
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jrp

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Re: DCamProf - a new camera profiling tool
« Reply #1526 on: March 20, 2017, 02:55:33 PM »

I was not expecting a replacement but some data that would obviate the tedious measurement task.
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torger

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Re: DCamProf - a new camera profiling tool
« Reply #1527 on: March 21, 2017, 03:34:36 AM »

They do provide some sort of matrix, if one has access to the ISO document one could find out exactly what type of matrix it is and how it's derived. In any case it can almost certainly be transformed into a matrix used for a matrix-only DCP or DNG profile, and then you can use the json2dcp or json2icc commands in DCamProf to make a profile.
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dwalme

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Re: DCamProf - a new camera profiling tool
« Reply #1528 on: April 20, 2017, 10:06:42 PM »

EDIT:  I received help below.   Removed files.

I hoping you guys can help me out.    First off thank you for building this awesome tool.    I use Capture One Pro 10 and I'm not happy with the default color profiles.    Between my cameras I get different color output and on my Sony RX100 V the default color profile is just terrible.

I followed the directions in the "Easy" guide for C1 to create the ICC profiles for my cameras.  The color output is better than the default profiles in C1.   However it seems for all of the profiles that I have created there is a brightness added compared to the default profiles.    At first I thought it was a tone curve issue, but now I'm not sure.  You can see the histogram shifts to the right a little bit.

I'm using the color targets from the imaging resource.  This one here for example.

These are the commands that I have run (using latest version of dcamprof 1.0.5).

scanin.exe -v -p -dipn cc24.tif ColorChecker.cht cc24_ref.cie

dcamprof make-target -X -f cc24.tif -p cc24.ti3 linear-cc24.ti3

dcamprof make-profile -i D50 -C linear-cc24.ti3 my-profile.json

dcamprof tiff-tf -f cc24.tif cc24_film.tif tone-curve.json

dcamprof make-icc -f cc24_film.tif -t tone-curve.json my-profile.json prelim-profile.icc

dcamprof make-icc -n "Sony DSC-RX100M5" -f cc24_film.tif -t tone-curve.json -t lut-curve.json -g adobergb-strong my-profile.json SonyRX100M5-Standard-D.icc

I appreciate any help you can provide.
« Last Edit: April 30, 2017, 12:44:37 PM by dwalme »
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dwalme

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Re: DCamProf - a new camera profiling tool
« Reply #1529 on: April 23, 2017, 10:36:25 AM »

What I have discovered is the Film Standard curve that is applied to the image from the RX100V doesn't achieve the same brightness level in C1 as the images for my Sony A7Rii and A6300.    The darker the image prior to export the brighter the color profile will be it seems.

What I mean by that is you have X brightness with the Linear curve and Y brightness level with the Film Standard curve.

For A7Rii and A6300 you get the same relative boost in image brightness (Y) with Film Standard curve applied.

When I apply the Film Standard curve to the RX100V test image for export the brightness level Y is only 60-75% what it is compared to the other cameras.   I don't know why.   Seems C1 applies a different Film Standard curve to the RX100V test image compared to the other cameras and that messes up the color profile in the end.   As when you load a regular image it seems C1 applies a comparable Film Standard curve that is applied to my A7Rii and A6300 test images.

In order to match the brightness level of the "Generic" profiles in C1 it seems you want your test image to show a color readout of ~230 for the D1 white color patch before exporting the files for dcamprof.

This is my first go at this so I could be doing it all wrong.   However I get pleasing "true to life" color for my A7Rii and A6500.   While the color profiles are different between those two cameras I'm finding the color profile I generated for the A6300 works well with my A6500 (same sensor - no surprise) and also works well with my RX100V (where as the A7Rii profile doesn't work well with my A6500 or RX100 V).

I think the best thing to do would be to get a CC24 color target and take my own images outside under sunlight.

Hope this helps someone else.  And if anyone can make sense of what I've experienced and has more knowledge to share to help me I'd appreciate it.     
« Last Edit: April 25, 2017, 10:31:02 AM by dwalme »
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sebbe

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Re: DCamProf - a new camera profiling tool
« Reply #1530 on: April 25, 2017, 03:35:33 AM »

Hi Dan

As you already found out the darker the shot of the target is, the brighter the profile will be. Actually it's the best to create a shot with the exact brightness you need for the target. For D1 this will be around 243 (with sRGB). It's better to use a brighter shot (without clipping) if you don't hit the exact value.

Then there is also the lens in front of your camera that has an influence. Some lenses adds contrast and get clippings faster than others. If I'm shooting the same target with the same settings with different lenses I'll get different values. Here are three D1 values from a few shots I made recently of the same setting with three different lenses on my Sony a7RII: Sony 90 G Macro: 244, Sony 85 GM: 230, Sony 70-300 G: 255 (clipped). If the colors of these lenses are not completely different, you can still use one profile for all lenses. But expect different steps in processing (especially for contrast, clipping, brightness, exposure, ...). As you can identify out of my answer a different lens will end up in different behaviour with the same curve (no matter of film standard or linear curve).

I hope this will answer most of your questions along with the PM I'll sent to you.
Cheers, seb
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markanini

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Re: DCamProf - a new camera profiling tool
« Reply #1531 on: April 25, 2017, 05:24:26 AM »

Late to the party, I know, but it was interesting reading about RGB-Lum and CAT tweaks a few pages back. I'm sure I'll enjoy trying the new features out once they're released.
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torger

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Re: DCamProf - a new camera profiling tool
« Reply #1532 on: April 25, 2017, 08:14:30 AM »

I haven't written here for a while, but I've been busy working with the GUI version. It's in feature freeze (only bug fixing left), and I'm working on the manual. It's going a bit slow and I'm starting a new project (in my main business, telecom) plus some stuff happening in my personal life which will make it harder to spend a lot of time on this. I still hope I can release late May or early June.

The CAT tweaks were eventually canned, didn't work out in the end. RGB-Lum is in there though, but will be in the GUI version only first, until l have the time to update DCamProf with the new features. There's quite much new stuff, not just RGB-Lum. The big thing is a full 3D LUT intended for reproduction profiles, plus a new smarter LUT relax algorithm.

Thanks for providing answers above by the way, I don't have as much time to provide support for the moment while trying to finalize this GUI version.
« Last Edit: April 25, 2017, 08:49:59 AM by torger »
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dwalme

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Re: DCamProf - a new camera profiling tool
« Reply #1533 on: April 25, 2017, 10:30:43 AM »

I hope this will answer most of your questions along with the PM I'll sent to you.
Cheers, seb

Yes it does.   Thank you very much for the reply.     That was very helpful.

I will test a bit more and see what results I get.

Dan
« Last Edit: April 30, 2017, 12:40:44 PM by dwalme »
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mouse

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Re: DCamProf - a new camera profiling tool
« Reply #1534 on: May 06, 2017, 06:02:09 PM »

Hi Jack,
             torger has correctly diagnosed the problem - the ColorChecker recognition layout is not identical to that of the Passport.  I have hacked together a half Passport .cht file that may work better if only the ColorChecker 24 side of the chart has been shot, and it is here.

When using the HalfPassport.cht  how should the image be oriented?  Black patch lower right OR Black patch upper left?

Thanks for your help.
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GWGill

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Re: DCamProf - a new camera profiling tool
« Reply #1535 on: May 07, 2017, 04:28:14 AM »

When using the HalfPassport.cht  how should the image be oriented?  Black patch lower right OR Black patch upper left?
It shouldn't matter, but CC convention is black square lower right.
« Last Edit: May 07, 2017, 08:45:38 PM by GWGill »
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mouse

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Re: DCamProf - a new camera profiling tool
« Reply #1536 on: May 08, 2017, 04:22:53 PM »

It shouldn't matter, but CC convention is black square lower right.

Many thanks for the swift reply.
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mouse

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Re: DCamProf - a new camera profiling tool
« Reply #1537 on: May 10, 2017, 06:52:29 PM »

First, many thanks for your software.  I admit I am still struggling to comprehend all the subtleties.
 
One question, and I hope this is not a repetition of something appearing earlier in this thread:

I quote from your instructions:
Quote
"As I also contribute to the RawTherapee project, there’s now actually a “perceptual” curve there which is based on DCamProf’s neutral tone reproduction operator (a bit simplified), so for RawTherapee you can provide a profile without a curve and instead apply it using the built-in curve adjustment,"

You make use of this curve in the command for merging into a dual illuminant profile:
Quote
dcamprof make-dcp -n "Canon EOS 5D Mark II" -d "My Profile" -i StdA -I D50 \ -b 0.3 -t curve.rtc -g adobergb-strong \ final-2.json final-1.json final-dual.dcp


Here it is referred to as curve.rtc.  Nowhere can I find the instructions for creating this file. 
Can you help?  Again many thanks.l
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mouse

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Re: DCamProf - a new camera profiling tool
« Reply #1538 on: May 12, 2017, 01:34:28 AM »

Clearly I am a rank beginner just exploring the possibilities of using DCamProf to create better camera profiles (DCP).
After spending a good bit of time reading the documentation I decided to put a toe into the water.  After just about knee depth I ran into a problem.  Not really a problem but an unexpected result.  Just as a sanity check I attempted to create a (Argyll type)-.val file:

I made a raw image of the Color Checker Passport, opened it in RawTherapee;  Neutral profile.  Cropped the image fairly tightly to just the color patch page of the Color Checker.  Ensure the black patch is positioned at lower right.  In RT Color Management tool: click "Save reference image for profiling"; apply white balance NOT checked.   Resulting image file name: CCPP.tif.

I then proceeded to create a .val file.  This file should contain the RGB values for each of the 24 color patches. First opened a command promp in the folder containing the tif image.

scanin -o -dipn CCPP.tif %ARGLREF%\ColorCheckerHalfPassport.cht diag.tif

The process ran smoothly with no errors reported.  the resulting output files:  diag.tif  when opened showed perfect registration and no alignment errors.
The file CCPP.val gave R, G & B values for each of the color patches as expected.

The PROBLEM:  The RGB values shown by the file did not come even close to approximating the reference values for the ColorCheckerPassport derived from several online sources.  Is this to be expected?  If not, where have I gone wrong?

I have searched the 77+ pages of this thread for appropriate clues but, no luck.  I hope I am not re-covering subjects which have long been answered.

Many thanks for any help offered.

P.S.  Since this is primarily an Argyll exercise, I should probably address the question to Mr. Gill..
« Last Edit: May 12, 2017, 04:02:33 PM by mouse »
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sebbe

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Re: DCamProf - a new camera profiling tool
« Reply #1539 on: May 15, 2017, 03:25:23 AM »

If it is not close two things come to my mind: your shot of the target is not good or you have bad/wrong reference values.
May you share your target shot, so we can have a look at?
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