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1:) you got the imread flags wrong

2.) no, it can't read float images from a .tif (.exr would be another thing) you will have to:

image = imread(a, CV_LOAD_IMAGE_ANYDEPTH); // Read the file, keep it 16 bits, if it was so
Mat img_float;
image.convertTo(img_float, CV_32F);
// .. use img_float ..

1:) you got the imread flags wrong

2.) no, it can't read float images from a .tif (.exr would be another thing) you will have to:

image = imread(a, CV_LOAD_IMAGE_ANYDEPTH); // Read the file, keep it 16 bits, if it was so
so originally
image = imread(a, CV_LOAD_IMAGE_ANYDEPTH); 
Mat img_float;
image.convertTo(img_float, CV_32F);
// .. use img_float ..

1:) you got the imread flags wrong

2.) no, it can't read float images from a .tif (.exr would be another thing) you will have to:to do it in 2 steps:

// 1. Read the file, keep it 16 bits, if it was so originally
originally:
image = imread(a, CV_LOAD_IMAGE_ANYDEPTH); 
// 2. convert the img to float:
Mat img_float;
image.convertTo(img_float, CV_32F);
// .. use img_float ..