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I had finally some rawdatas but, it wasn't what i expected. It seems that i have a monochromous picture only raw_image is filled how can i acces the raw data without processes ?

Because i've always worked with ppm and pgm pictures, for that projecti needd to use my .NEF in order to make some deep image processing on it with OpenCV. I'd like to get frow libraw a Matrix (Height x Width x Channels (here 3)) to put it in OpenCV and start to process the images.

Really thanks again !