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just to clarify the question

test code

#include "opencv2/highgui.hpp"

using namespace cv;

int main( int argc, char** argv )
{
    Mat src1 = imread( "t1.JPG" );
    Mat src2 = imread( "t1-clahe2.JPG" );

    imwrite("imwrite-t1.jpg",src1);
    imwrite("imwrite-t1-clahe2.jpg",src2);

    imshow("t1.JPG",src1);
    imshow("t1-clahe2.JPG",src2);
    waitKey(0);

    return 0;
}

screenshot of Windows7 Explorer window image description

just to clarify the question

test code

#include "opencv2/highgui.hpp"

using namespace cv;

int main( int argc, char** argv )
{
    Mat src1 = imread( "t1.JPG" );
    Mat src2 = imread( "t1-clahe2.JPG" );

    imwrite("imwrite-t1.jpg",src1);
    imwrite("imwrite-t1-clahe2.jpg",src2);

    imshow("t1.JPG",src1);
    imshow("t1-clahe2.JPG",src2);
    waitKey(0);

    return 0;
}

screenshot of Windows7 Explorer window image description

EDIT :

Camera orientation handling is newly added to OpenCV

my result is as following reverting Camera orientation handling

image description