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How Can we extract the green channel matrix alone from colour image? Is there any formula apart from matlab extraction

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x 2016-3-4
回答： Walter Roberson 2016-3-4
How Can we extract the green channel matrix alone from colour image

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回答（2 个）

Guillaume
Guillaume 2016-3-4
greenchannel = rgbimage(:, :, 2);
The first page of an rgb image is the red channel, the 2nd is the green channel and the 3rd is the blue channel, hence the name rgb.
Walter Roberson
Walter Roberson 2016-3-4
If you need to do it by mathematical formula, then you can use a Projection Matrix
[r, c, p] = size(YourRGBArray);
GreenPlane = reshape(reshape(YourRGBArray,[], 3) * [0; 1; 0], r, c);
I do not recommend this for practical use; matrix indexing is faster and clearer.

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