I looked at your m-file. You get your data like this:
A = fread(fid,size,'*uint16');
img = reshape(A,width,height); %ok-->poi trasponi
Did you know you can get the 2D matrix directly like this:
img = fread(fid, [width, height], '*uint16');
% It will be a 2D array after this.
No reshaping will be necessary. Anyway, to get it into PNG format you have to save it out to disk as a PNG format image file because when it's in MATLAB it's simply an array of numbers and format doesn't really apply.
baseFileName = 'My matrix.png';
fullFileName = fullfile(folderName, baseFileName);
imwrite(img, fullFileName);
