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issue solved

The problem was related with openCV not rawpy or libraw. OpenCV uses BGR format,not RGB. so when i used cv2.imshow() after debayering using libraw , the colors swapped in R and B channel.

Sloution: convert RGB matrix to BGR before using cv2.imshow(). Open CV has a builtin function to do so, cv2.cvtColor(img, cv2.COLOR_RGB2BGR)