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How to convert red channel of a rgb image to grayscale image?

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Ghazal Hnr
Ghazal Hnr 2018-5-25
评论： Ghazal Hnr 2018-5-25
I have some rgb images. I want to know is there any way to only convert the red channel of them to grayscale?

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Image Analyst
Image Analyst 2018-5-25
Yes. Very easy:
redChannel = rgbImage(:, :, 1); % Extract the red channel only into a gray scale image.
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Image Analyst
Image Analyst 2018-5-25
That is a bad explanation and they should know better. When you extract the red channel, it is already a grayscale image at that point -- there is no need for a second step of converting it to a gray scale image.

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