Transforming a matrix in an image

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Oliver Lestrange
Oliver Lestrange 2020-8-10
评论： Oliver Lestrange 2020-8-10
Hi community,
I am transforming a matrix in an image, but when I try to see the green and blue components of the image a get the error Index exceeds matrix dimensions.
dmin1=2;
n=15;
A=ones(n);
A(2:dmin1:end,2:dmin1:end)=0;
im = imshow(A,[])
%im = image(im,'CDataMapping','scaled')
...
... % code that add some colors to im
R=im(:,:,1)
G=im(:,:,2)
B=im(:,:,3)
What I'm doing wrong?
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VBBV
VBBV 2020-8-10
编辑：VBBV 2020-8-10
Try using dmin1 = 1; as the increment step.
Oliver Lestrange
Oliver Lestrange 2020-8-10
I can't do that Vasishta Bhargava, that will change the appearance of the matrix.

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Image Analyst
Image Analyst 2020-8-10
First of all, your image is A, not im. im is what imshow returns and it is the handle to an image object, not an actual image itself. Secondly, you declared A as a 2-D gray scale image, not a 3-D color image. You'd need to make A like this:
A=ones(n, n, 3);
A(2:dmin1:end, 2:dmin1:end, :) = 0;
R = A(:,:,1)
G = A(:,:,2)
B = A(:,:,3)
or
[R, G, B] = imsplit(A);

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