DCamProf - a new camera profiling tool

[Hening Bettermann]

Are there any fuller instructions around on how to extract the target image correctly for use with dcamprof.

If I extract it from the raw linear TIFF using Photoshop, for example, is Photoshop going to apply a profile (unless I say it should be unmanaged)?

I would use RawTherapee, as suggested, but the interface is fairly non-standard.  Before I dive into the manual, is there a quick recipe for getting it to do the necessary, if that is preferable to using DCRaw?

[...] 

Thanks.

Open the raw file in Raw Therapee, go to Editor > Color > Color Management. There is a command 'Save Reference Image for Profiling'. The tool tip says something like 'Save the linear TIFF image before the input profile is applied. The result can be used for calibration purposes and generation of a camera profile.' This is the one. It looks like you still will need to zero various other parameters in the Editor panel. The GUI may be unusual, but it's quite systematic/logic/intuitive. Even I as a Mac user can quite easily find my way around just looking at all the tool tips.

Good light!

[AlterEgo]

Are there any fuller instructions around on how to extract the target image correctly for use with dcamprof.

Rawdigger PE does a good job...

[jrp]

Thanks.  Yes, it does, but it seems costly for the limited task that I would use it for.

[howardm]

I still dont have an answer/reason it wont download but if someone wants/needs the Mac version, send me a private message and include your email address and I'll send it to you directly (assuming you can receive a 10MB email)

[AlterEgo]

Thanks.  Yes, it does, but it seems costly for the limited task that I would use it for.

for a limited task the trial shall work ....

[howardm]

Well, it appears as though the issue is that box.com has a monthly bandwidth cap of 10GB.  I have a very hard time believing that I busted that cap but that what they are telling me.  So, the box.com link is dead until June 1.

I've copied the Macintosh dcamprof stuff over to OneDrive for now............

https://onedrive.live.com/redir?resid=C3203EEC29F80668!260&authkey=!AD4b0aQht3zfw8g&ithint=folder%2cpng

[Hening Bettermann]

@howardm
Yes this one downloaded without problems. Thank you for making this possible.

[jrp]

for a limited task the trial shall work ....

Thanks.  I'll give it a go.  Looking at the instructions on your site, I see that you recommend output gamma of 1.8.  Is that right for dcamprof?

[AlterEgo]

Thanks.  I'll give it a go.  Looking at the instructions on your site, I see that you recommend output gamma of 1.8.  Is that right for dcamprof?

not exactly... if you are looking to compensate C1 'transfer function' more precisely then you can extract it from .tiff and then apply it according to your profile building workflow... alternatively you certainly can use gamma around ~1.8* (tastewise, may be you like something between 1.7* and 1.9*)... your call... but 'transfer function' != gamma

that is if you are talking about C1 raw converter of course

[howardm]

@Hening
You're welcome.  It's at least some small attempt to 'give back' to the community here that has taught me so much.

I had no idea BOX had a monthly BW cap.  Will have to examine alternatives.

[jrp]

not exactly... if you are looking to compensate C1 'transfer function' more precisely then you can extract it from .tiff and then apply it according to your profile building workflow... alternatively you certainly can use gamma around ~1.8* (tastewise, may be you like something between 1.7* and 1.9*)... your call... but 'transfer function' != gamma

that is if you are talking about C1 raw converter of course

I'm talking about Adobe / DCP.

The scanin tool find that my pattern match is not good enough, so I'm a bit stuck.

scanin -v -p -G 1.0 -dipnvh 20160521-122518_L1010315-cut.tif ColorCheckerPassport.cht cc24_ref-new.cie
TIFFFetchNormalTag: Warning, Incompatible type for "RichTIFFIPTC"; tag ignored.
Input file '20160521-122518_L1010315-cut.tif': w=1000, h=668, d = 3, bpp = 8
Data input file 'cc24_ref-new.cie'
Data output file '20160521-122518_L1010315-cut.ti3'
Chart reference file 'ColorCheckerPassport.cht'
Creating diagnostic tiff file 'diag.tif'
About to allocate scanrd_ object
Verbosity = 2, flags = 0x62a07
About to read input tiff file and discover groups
adivval = 1.000000
About to calculate edge lines
198 useful edges out of 314
About to calculate perspective correction
Perspective correction factors = 0.000009 -0.000001 500.000000 334.000000
About to calculate rotation
Mean angle = 0.170600
Standard deviation = 0.803220
Robust mean angle = 0.145905 from 163 lines
About to calculate feature information
About to read reference feature information
Read of chart reference file succeeded
About to match features
Checking xx
Checking yy
Checking xy
Checking yx
Checking xix
Checking yiy
Checking xiy
Checking yix
Axis matches for each possible orientation:
  0: xx  = 0.200645, yy  = 0.056684, xx.sc  = 0.269088, yy.sc  = 0.207938
 90: xiy = 0.096582, yx  = 0.115018, xiy.sc = 0.393503, yx.sc  = 0.125325
180: xix = 0.211312, yiy = 0.058271, xix.sc = 0.269088, yiy.sc = 0.207334
270: xy  = 0.111208, yix = 0.120400, xy.sc  = 0.277110, yix.sc = 0.124871
r0 = 0.161118, r90 = 0.047834, r180 = 0.168894, r270 = 0.073857
There are 0 candidate rotations:
About to write diag file
Argyll 'V1.8.3' Build 'OS X 64 bit' System 'Darwin Darwin Kernel Version 15.5.0: Tue Apr 19 18:36:36 PDT 2016; root:xnu-3248.50.21~8/RELEASE_X86_64 15.5.0 x86_64'
scanin: Error - Scanin failed with code 0x3, Pattern match wasn't good enough

[torger]

Have a look in your "diag.tif", it usually gives a lead of what's wrong in the picture. Argyll's scanin is very sensitive, it needs a perfectly flat projection, no rotation, and without any surroundings.

[jrp]

Thanks.  I've tried it with and without the corner markers (although the documentation says that the latter should be included).

Most lines are detected (see attached).

[GWGill]

The scanin tool find that my pattern match is not good enough, so I'm a bit stuck.

Hard to know why without more information, but if it's normal orientation, try running with the -a flag added, and see what happens. Check the diag output.

[jrp]

Thanks.  The previous 2 posts give those diagnostics.

[torger]

The shot orientation looks perfectly okay. Maybe there's something wrong with the colors is the converted file? I note in the log output that the input file is only 8 bits, it should be 16 bit if you converted in any of the ways suggested in the docs.

I assume you're making a file for DCP? It should look greenish, like this:

http://www.ludd.ltu.se/~torger/photography/camera-profiling.html#step4

The easiest way to do it with free tools is using RawTherapee (as you can crop/rotate there), described here:
http://50.87.144.65/~rt/w/index.php?title=Color_Management#Save_Reference_Image_for_Profiling

If you're going to use the profile in Adobe Lightroom it's safest to first make a DNG via Adobe DNG Converter and make the reference image from that, as raw decoding might differ. If you don't have a too exotic camera it shouldn't differ though and you could use the native raw also in RawTherapee/DCRaw.

[Alexey.Danilchenko]

I had no idea BOX had a monthly BW cap.  Will have to examine alternatives.

If you have Gmail, Google Drive is a very good alternative and its free.

[howardm]

Thanks but I try to avoid most Google products these days.

[Bart_van_der_Wolf]

Thanks but I try to avoid most Google products these days.

In which case there is still Dropbox (in case you want to avoid Microsoft's OneDrive as well).

Cheers,
Bart

[jrp]

The shot orientation looks perfectly okay. Maybe there's something wrong with the colors is the converted file? I note in the log output that the input file is only 8 bits, it should be 16 bit if you converted in any of the ways suggested in the docs.

I assume you're making a file for DCP? It should look greenish, like this:

http://www.ludd.ltu.se/~torger/photography/camera-profiling.html#step4

The easiest way to do it with free tools is using RawTherapee (as you can crop/rotate there), described here:
http://50.87.144.65/~rt/w/index.php?title=Color_Management#Save_Reference_Image_for_Profiling

If you're going to use the profile in Adobe Lightroom it's safest to first make a DNG via Adobe DNG Converter and make the reference image from that, as raw decoding might differ. If you don't have a too exotic camera it shouldn't differ though and you could use the native raw also in RawTherapee/DCRaw.

Thanks.  This is for the Leica SL, which generates DNGs natively.

I converted to TIFF copying and pasting the dcraw command line that you have on the tutorial page, I think, so not sure why it's not 16-bit.

I have then taken the resulting TIFF into Photoshop (unmanaged) and used the warp tool to correct perspective, cropped and run scanin as above.