Thank you for the sample.
In this sample:
- there is no EXIF/GPS records
- all location information is contained in XMP block

So, LibRaw does not read it

LibRaw postprocessing is very similar to dcraw.c's one, so excellent 'dcraw annotated and outlined' site (https://ninedegreesbelow.com/files/dcraw-c-code-annotated-code.html ) may be useful.

Hi Alex,
Now I am looking for a way to get the process data where you have subtracted the black level, w/ white balance and demosaic, can you please help to explain the procedure? Thanks!

Hi Alex,
I use the prebuilt library for win 64 and successfully embedded into visual studio. I would like to share my method as following:
1. Extract the binaries for x64.
2. Go into visual project. Open Project Properties, In Configuration Properties:
a. /Debugging/Enviornment: add the path to LibRaw-xxx\bin
b. /C/C++/General/Additional Include Directories: add the path to LibRaw-xxx\
c. /Linker/General/Additional Library Directories: add the path to LibRaw-xxx\lib
/Linker/Input/Additional Dependencies: add libraw.lib and libraw_static.lib
My testing code is following:

#include "libraw/libraw.h"
#include "opencv2/highgui/highgui.hpp"
#include "iostream"
#include "stdio.h"

using namespace std;
using namespace cv;

int main() {
// Let us create an image processor
LibRaw iProcessor;
// Open the file and read the metadata
iProcessor.open_file("D:/[01]Luan_van_thac_si/PROJECT/Non_Cuda/SLIC/SLICSuperPixel/DSC01042.ARW");

// The metadata are accessible through data fields of the class
cout << "Image width = " << static_cast(iProcessor.imgdata.sizes.width)
<< ", Image height = " << static_cast(iProcessor.imgdata.sizes.height) << endl;

waitKey();
return 0;
}

Results: Image width = 6024, Image height = 4024

I hope this answer will help other users and thanks for wonderful library!

I think its because of the exiftool. The original IIQ image metadata seems different. Do you know an easy way to tell if its in the exif or xmp ? I will ask my coworker to see if we can create a IIQ with gps and no sensitive info but it may take several days.

Thank you for your reply. I don't have any images with GPS from our company that may not be sensitive to post on a forum but I found one having no gps information. I used the exiftool to copy exif metadata from one image (having gps) to this one. Hope that helps.

http://www.mediafire.com/view/i9we9h6jkt9kfum/C0079_3508_238162.IIQ

Assuming, you're using LibRaw's dcraw_emu sample, not some other app that uses LibRaw:

LibRaw's own TIFF writer routine is very simple, it is used to not depend on additional libraries (e.g. libtiff). So only minimal EXIF data is recorded into output.

LibRaw is opensource, we're open to user contribution. So feel free to implement own TIFF writer (w/ extensive EXIF recording) we will be happy to add it to LibRaw (if you wish so).

Thanks Alex

Hi Alex,
Thank you for the quick support.
For now, I think unaltered raw data would be enough for my purpose.

yes, raw colorspace is 'as is'

Use latest public beta.

Yes, it is still valid.