MATLAB: Image into grayscale without using toolbox

image processingImage Processing Toolbox

This is my current code:
function out = luminance(current_img )
  R=current_img(:,:,1);
  G=current_img(:,:,2);
  B=current_img(:,:,3);
  I=.299*R + 0.587*G+0.114*B;
  out=I;
  end
I'm trying to make my image grayscale but that's not what's happening, what am I doing wrong?

Best Answer

That should work. What's the problem? Perhaps you want to cast it back to uint8 or something.
 out = uint8(.299*double(R) + 0.587*double(G)+0.114*double(B));
or else just leave it as floating point and use [] in imshow to display it:
imshow(out, []);
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