How to convert an image to a float image in opencv?

Question

I have this code:

  Mat image00=imread("C:\\Working Dir\\Tests\\TestBlending\\layer0000.jpg");
  Mat image0;
  image00.convertTo(image0,CV_32FC3);

But after converting my image to float, the image is blank (all values are zero).

What is wrong with this code and how can I fix it?

Answer 1

Try these:

1) image00.convertTo(image0, CV_32FC3, 1/255.0);

Mat Image type CV_8UC3, value is from 0 to 255. While CV_32FC3 is between 0.0 and 1.0, hence you have to scale it. If I am not wrong, you receive all zero values as the image consist of mainly BGR values under 125? If it still doesn't work, try this:

2)

//CvType
 image00.convertTo(image0, CvType.CV_32FC3, 1/255.0); //with or without scaling, try both

Should solve your problem(: