Image into grayscale without using toolbox

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Krish Desai
Krish Desai 2015-10-12
评论： Krish Desai 2015-10-12
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?

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Image Analyst
Image Analyst 2015-10-12
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, []);
  2 个评论
Krish Desai
Krish Desai 2015-10-12
The image is coming out in blues, yellows and greens. I tried typecasting but it didn't work.

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