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if your opencv libs were compiled with openexr support (check cv::getBuildInformation()), you can save the image as .exr or .hdr . this is the only way with imread/imwrite.
you can save it as a text file, using FileStorage:

Mat floatImg = ... FileStorage fs("my.yml", FileStorage::WRITE); fs << "myimg" << floatImg; fs.release();

Mat floatImg; FileStorage fs("my.yml", FileStorage::READ); fs["myimg"] >> floatImg; fs.release();

if your opencv libs were compiled with openexr support (check cv::getBuildInformation()), you can save the image as .exr or .hdr . this is the only way with imread/imwrite.
~~you can save it as a text file, using FileStorage:~~

Mat floatImg = ... FileStorage fs("my.yml", FileStorage::WRITE); fs << "myimg" << floatImg; fs.release();fs.release(); Mat floatImg; FileStorage fs("my.yml", FileStorage::READ); fs["myimg"] >> floatImg; fs.release();fs.release();