write (save) an image file

i had a .mha file, i used the below two lines to display the image and i get the first full image as in the link below....

 V = mha_read_volume('BRATS_HG0001_truth.mha');
 imshow(squeeze(V(:,:,round(end/2))),[]);

please can someone help me how to save that image to a jpg or bmp or tiff file....

i tried

 imwrite(squeeze(V(:,:,round(end/2))),'filename.bmp')

but i'm not getting the image... i get the outline of the image as shown in link (image(b))... what should i do to save as image(a)

http://imageshack.com/a/img838/8308/yc91.png

Answer 1

[Walter Roberson]

Notice that when you call imshow you are providing the [] second parameter. That tells imshow() to effectively shift and scale the data so that it runs between 0 and 1. You can do the same tranformation:

newimage = squeeze(V(:,:,round(end/2)));
minimage = min(newimage(:));
maximage = max(newimage(:));
scaledimage = (newimage - minimage) ./ (maximage - minimage);

imwrite(scaledimage, 'filename.bmp');

[Elysi Cochin]

sir when i did so i got the below error

 ??? Error using ==> writebmp at 16
 Class of X must be logical, uint8, single, or double.

 Error in ==> imwrite at 431
        feval(fmt_s.write, data, map, filename, paramPairs{:});

 Error in ==> Demo at 10
 imwrite(scaledimage, 'filename.bmp');

so i edited the line to

 scaledimage = uint8((newimage - minimage) ./ (maximage - minimage));

but that time when i write i get a fully black image and nothing else....

how to correct the above error....

[Image Analyst]

Try casting everything to double to do the math, then cast back to uint8 inside the call to imwrite().

[Elysi Cochin]

now it worked... thank you Walter Roberson and Image Analyst for your help....

[Syed Mobashir]

i am also getting the same black image. can you tell me this code? plzzz i need this urgent