imwrite a Mat_float keeping the image.

edit

How do you save your image ? I think only yml format can save float image

as jpg, but i could try yml. It could not write to specified extension.

You have to do something like this :

Mat m=acos(-1)*Mat::ones(256,256,CV_32FC1);
cv::FileStorage fs("image.yml", cv::FileStorage::WRITE);
fs<<"Image"<<m;

It's a text format so it's not very efficiency in size but it's readable with a text editor. You can add tgz extension and it would be compressed.

You can use this technique too

what is Mat m=acos(-1)*Mat::ones(256,256,CV_32FC1); ?

Could you explain what you are doing?

It's only an example : an image 256 rows by 256 column of type float(32F) with one channel (C1). All pixel values are equal to 3.14159274

'fs<<"Image"<<m'< p="">

fs is the file "image" ? i don't get and m is the Mat_<float> ?

If you prefer :

Mat_<float> output=acos(-1)*Mat::ones(256,256,CV_32FC1);// your data in float
cv::FileStorage fs("image.yml", cv::FileStorage::WRITE);// image.yml file name
fs<<"ImageId"<<output; // text id of your data

to read you can do :

Mat mread;
cv::FileStorage fs("image.yml", cv::FileStorage::READ);
fs["ImageId"]>>mread;
cout << mread.at<float>(10,10)<<endl;

you can read this example

So i can't save as an viewable image and then process it again?

That's another question you can just changed name file

both save it as black images.