Creating a DNG from scratch.

Hi,

I'm trying to save camera raws(16 Bit Bayer pattern) I grab directly from an industrial camera in the DNG format.

By looking at http://fossies.org/dox/digikam-2.5.0/dngwriter_8cpp_source.html#l00188 - the only example I could find online - I have been able to create a file which Photoshop & co are able to read. However I had to do some guesswork. Specifically I had to specify a profile with the following lines:

prof->SetColorMatrix1((dng_matrix) matrix);

prof->SetCalibrationIlluminant1(lsD65);

negative->AddProfile(prof);

dng_vector camNeutral(identify.rawColors);

for (int i = 0; i < identify.rawColors; ++i)

{

    camNeutral[i] = 1.0/identify.cameraMult[i];

}

negative->SetCameraNeutral(camNeutral);

I don't have this information. Just adding the identity matrix produces a strange tint.

What is the simplest way of saying "the camera sensor is linear" and "I know nothing about the color temperature"?

I'm thankful for any help!