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resolved with some help from here

http://stackoverflow.com/questions/10571874/opencv-imwrite-saving-complete-black-jpeg?lq=1

resolved with some help from here

    image.convertTo(image, CV_8UC3, 255.0); 
    imwrite(path, image);

http://stackoverflow.com/questions/10571874/opencv-imwrite-saving-complete-black-jpeg?lq=1