Save floating point TIFF images

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Hi team, I work with a team that uses MATLAB for image analysis. They trade floating point TIFF files for analysis. I am working through the simple read/write tutorials but am frustrated by the fact that I cannot write out a floating point TIFF file.

here is some code I've been using:

#include <stdio.h>
#include <opencv2/opencv.hpp>

using namespace cv;

int main(int argc, char** argv )
{
    if ( argc != 4 )
    {
        printf("usage: DisplayImage.out <Image_Path>\n");
        return -1;
    }

    //read images from memory
    Mat A;
    A = imread( argv[1], CV_LOAD_IMAGE_UNCHANGED );
    Mat B;
    B = imread( argv[2], CV_LOAD_IMAGE_UNCHANGED );
    Mat C;
    C = imread( argv[3], CV_LOAD_IMAGE_UNCHANGED );

    //create floating point images for image manipulation
    Mat Aa;
    A.convertTo(Aa,5);
    Mat Bb;
    B.convertTo(Bb,5);
    Mat Cc;
    C.convertTo(Cc,5);

    if ( (!Aa.data) || (!Bb.data) || (!Cc.data) )
    {
        printf("Missing image data \n");
        return -1;
    }

    //subtract dark field from source image
    Mat D;
    D = Aa - Bb;
    Mat E;
    E = Cc/D;

    //save intermediate images
    imwrite("D.tiff",D);
    imwrite("E.tiff",E);

    //save image

    return 0;
}

This code compiles fine, and runs, yet it saves no images. If I rewrite the code to work with 16 bit images, it works fine. What's going on?

Thanks in advance!