Convert RAW File (images) to PNG

Hi.

I have a MRI dataset file contain raw and mhd files.

i read this images with the below code :

id = fopen('filename.raw');
img = fread(id,'short');
imgsize = size(img);
rows = 512;
clos =512;
nums = imgsize(1)/rows/clos;
img = reshape(img,[rows,clos,nums]);
single_image = reshape(img(:,:,3),[rows,clos]);
single_show = uint8(single_image);
imshow(single_show)

But in the following I want to convert these images into PNG format.

I would be grateful if you could help me with this image conversion section.

[Cris LaPierre]

See also: https://www.mathworks.com/matlabcentral/answers/1777995-convert-raw-and-mhd-file-images-to-jpg?s_tid=srchtitle

[rezvan raz]

thanks but both of them are my questions without any answers :))

[Cris LaPierre]

I know, but they are essentially the same question, so anyone answering this one could probably help answer the other one.

Answer 1

[DGM]

A .raw file can be a number of different things. I'm not familiar with .mhd files, so I can't comment on that. It's not clear to us what you have or whether the code you show is working as intended.

If the above code isn't correctly working, you'll have to describe the issue and provide an example file.

If the code is working and single_show is correctly scaled for its class and displaying as expected, then I don't see why you can't just write the image using imwrite(). If you need to write all pages as individual images, just write them in a loop.

fid = fopen('filename.raw');
framestack = fread(id,'short');
fclose(fid);

imgsize = size(framestack);
rows = 512;
clos = 512;
fextension = '.png';

numframes = imgsize(1)/rows/clos;
framestack = reshape(framestack,[rows,clos,nums]);

% loop through frames/pages
for f = 1:numframes
    % casting as uint8 may not be necessary or appropriate
    % i can't know what your data range/class are
    thisframe = uint8(framestack(:,:,f)); 
    
    % write the frame
    new_filename = sprintf('myimage_frame_%03d%s',f,fextension);
    imwrite(thisframe,new_filename);
end

If not that, you'll have to clarify.