How to save an image converted from RGB to greyscale?

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Kavorka
Kavorka 2016-3-16
回答： Walter Roberson 2016-3-16
I'm new to matlab and when I convert an RGB image to a greyscale intensity map, I can't get the output to save as a greyscale...it saves an an RGB. Is this because I am using imshow and then saving the figure? If so, can someone help me figure out how to work imwrite into this code? I'm using:
i = imread('sample.png');
i = im2double(i);
a = .299*i(:,:,1) + .587*i(:,:,2) + .114*i(:,:,3);
imshow(a);

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Walter Roberson
Walter Roberson 2016-3-16
imwrite(a, 'OutputFile.png')

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