...and a release plan will be a plus for this project...

Could you please provide raw file sample to check?

I have the same need as the OP, so I figured I'd comment rather than make a whole new post. How can I get a debayered RGB bitmap out of a RAW nef file?

EDIT: nevermind, I have an unpublished post with my question in it.

Okay, I'll upload another one soon. However how does LibRaw handle these cases? I mean if the tag is absent and I try to access its contents what is the expected result? Or better yet, is there a good way of checking it?

https://drive.google.com/drive/u/1/folders/0BwHd5YdfBGISbGw3RFVCVkc0eDA

The Raw image i used was also in that project, near the sln file.

I sent a project to your email. Please note that checkMetadataValue is written so, that if the value is absent then it should return "Missing", also note that even though it extracts altitude, after failing to extract longref it stops and does nothing with the rest of the file.

Also, I am concerned about other fields in GPS, for instance longitude returns 0s no matter what image I try.

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.