I can't find a way to attach a file, but here is a sample code that fails. I an extracting a lot of information so I am putting everything into a stream.

#include "libraw/libraw.h"
#include < iostream >
#include < sstream >

void getGPSinfo(string fileName)
{
LibRaw proc;
FILE *pf;
ostringstream stream;
proc.open_file(fileName);

libraw_gps_info_t GPSInfo = proc.imgdata.other.parsed_gps;

stream << "\"GPSAltitudeRef\"" << "->" << to_string(GPSInfo.altref);

pf = fopen("somePath\\debug.txt", "w");
fprintf(pf, stream.str().c_str());
fclose(pf);
proc.recycle();

}

imgdata.color.cam_xyz[] is exactly the same as Adobe DNG ColorMatrix2. It converts from XYZ to camera space.

cam_mul are in 'camera color space'.

For WB multipliers conversion to/from 'color temperature' please look into Adobe DNG SDK source (or into RawTherapee source), it it shorter way than translating Adobe code into english in this forum thread.

Good evening Alex. Would you kindly guide me a few steps forward with your suggestion? In dcraw I find the place where different color space is written. If I want to create something like linear to log, where would I change numbers? Where would I found these figures?
Thanks in advance

float out[3], out_cam[3][4];
  double num, inverse[3][3];
  static const double xyzd50_srgb[3][3] =
  { { 0.436083, 0.385083, 0.143055 },
    { 0.222507, 0.716888, 0.060608 },
    { 0.013930, 0.097097, 0.714022 } };
  static const double rgb_rgb[3][3] =
  { { 1,0,0 }, { 0,1,0 }, { 0,0,1 } };
  static const double adobe_rgb[3][3] =
  { { 0.715146, 0.284856, 0.000000 },
    { 0.000000, 1.000000, 0.000000 },
    { 0.000000, 0.041166, 0.958839 } };
  static const double wide_rgb[3][3] =
  { { 0.593087, 0.404710, 0.002206 },
    { 0.095413, 0.843149, 0.061439 },
    { 0.011621, 0.069091, 0.919288 } };
  static const double prophoto_rgb[3][3] =
  { { 0.529317, 0.330092, 0.140588 },
    { 0.098368, 0.873465, 0.028169 },
    { 0.016879, 0.117663, 0.865457 } };
  static const double aces_rgb[3][3] =
  { { 0.432996, 0.375380, 0.189317 },
    { 0.089427, 0.816523, 0.102989 },
    { 0.019165, 0.118150, 0.941914 } };
  static const double (*out_rgb[])[3] =

Yes, postprocessing code (after raw data read/unpack) is completely imported from dcraw without much improvement in functions.

Both 1D and 3D luts looks easy to implement assuming you've working code that replaces pixel value in place.

Assuming you're working in linear space in 'camera color', the best place to implement your code is convert_to_rgb_loop() function. It gets linear profile (out_cam[3][4]) that converts from camera space to output rgb. You may replace it with your code.

This function is already 'virtual', so it is very easy to implement any color conversion in derived class.

Sorry, dcraw_emu is 'demo for library users' (so, for app developers), not for end-user.

It is very limited in functions.

Yes, I did. It works(I think) and applies the icc profile. Gamma is correct but colors are faded.

My output command goes like this
dcraw_emu -T -a -p profile.icc my.dng

My output when running dcraw_emu in terminal looks like this

LibRaw-0.17.2/bin/.libs/dcraw_emu [OPTION]... [FILE]...
-c float-num       Set adjust maximum threshold (default 0.75)
-v        Verbose: print progress messages (repeated -v will add verbosity)
-w        Use camera white balance, if possible
-a        Average the whole image for white balance
-A <x y w h> Average a grey box for white balance
-r <r g b g> Set custom white balance
+M/-M     Use/don't use an embedded color matrix
-C <r b>  Correct chromatic aberration
-P <file> Fix the dead pixels listed in this file
-K <file> Subtract dark frame (16-bit raw PGM)
-k <num>  Set the darkness level
-S <num>  Set the saturation level
-n <num>  Set threshold for wavelet denoising
-H [0-9]  Highlight mode (0=clip, 1=unclip, 2=blend, 3+=rebuild)
-t [0-7]  Flip image (0=none, 3=180, 5=90CCW, 6=90CW)
-o [0-5]  Output colorspace (raw,sRGB,Adobe,Wide,ProPhoto,XYZ)
-o file   Output ICC profile
-p file   Camera input profile (use 'embed' for embedded profile)
-j        Don't stretch or rotate raw pixels
-W        Don't automatically brighten the image
-b <num>  Adjust brightness (default = 1.0)
-q N      Set the interpolation quality:
          0 - linear, 1 - VNG, 2 - PPG, 3 - AHD, 4 - DCB
          5 - modified AHD,6 - AFD (5pass), 7 - VCD, 8 - VCD+AHD, 9 - LMMSE
          10-AMaZE
-h        Half-size color image (twice as fast as "-q 0")
-f        Interpolate RGGB as four colors
-m <num>  Apply a 3x3 median filter to R-G and B-G
-s [0..N-1] Select one raw image from input file
-4        Linear 16-bit, same as "-6 -W -g 1 1
-6        Write 16-bit linear instead of 8-bit with gamma
-g pow ts Set gamma curve to gamma pow and toe slope ts (default = 2.222 4.5)
-T        Write TIFF instead of PPM
-G        Use green_matching() filter
-B <x y w h> use cropbox
-F        Use FILE I/O instead of streambuf API
-timing   Detailed timing report
-fbdd N   0 - disable FBDD noise reduction (default), 1 - light FBDD, 2 - full
-dcbi N   Number of extra DCD iterations (default - 0)
-dcbe     DCB color enhance
-eeci     EECI refine for mixed VCD/AHD (q=8)
-esmed N  Number of edge-sensitive median filter passes (only if q=8)
-acae <r b>Use chromatic aberrations correction
-aline <l> reduction of line noise
-aclean <l c> clean CFA
-agreen <g> equilibrate green
-aexpo <e p> exposure correction
-dbnd <r g b g> debanding
-mmap     Use mmap()-ed buffer instead of plain FILE I/O
-mem	   Use memory buffer instead of FILE I/O
-disars   Do not use RawSpeed library
-disinterp Do not run interpolation step
-dsrawrgb1 Disable YCbCr to RGB conversion for sRAW (Cb/Cr interpolation enabled)
-dsrawrgb2 Disable YCbCr to RGB conversion for sRAW (Cb/Cr interpolation disabled)
-disadcf  Do not use dcraw Foveon code either if compiled with demosaic-pack-GPL2

Ok, thanks for answers.
By the way. maybe you can answer. I,ve been exlporing the use of icc profiles in dcraw and also tried this in dcraw_emu. This works with -p [profile.icc] but I never get the colors right. It,s always washed out. Almost like dcraw is defaulting to raw color when using icc profiles? when trying the same profiles in photoshop or lightroom the colors are always right. Would be nice to have your point of view about this issue.
Thanks again.
/D

Hi!
Just compiled and tried out some different stuff in bin folder. Checked into dcraw_emu and I am used to work with the piping command in dcraw.
-c Write image data to standard output
Is piping working somehow with libraw or what,s the reason it isn,t?
Thanks
/D

Alex thanks for your support,

Turning of the the automation is giving me very bad images compared to the automated once. So, I would like to work with the automation but use the first images parameters for the rest of the set. Is there any way that i could retrieve the computed parameters(not the flags) by libraw and use them for the next RAW image? I don't want the parameters to be computed again and again for each raw file!!

Regards

The images taken are a series of photos even if i avoid the auto parameters i still find a significant difference in the radiometry so i am thinking there are some parameters that use the content of the image. As you know in this case the nature of the image is considered which gives me very different images radio-metrically. To avoid this i need to understand which uses the image content to perform enhancement which doesn't. Could you provide me something on this please.