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How do I save plot with specified x and y limits?

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Viron Gil Estrada
Viron Gil Estrada 2018-3-22
关闭： MATLAB Answer Bot 2021-8-20
I am trying to plot a pattern but it is located in the middle of an image and it is very small so I adjusted the x and y limits to show a closer view. Here is a part of my code below:
DP =fftshift(fft2(some_image));
DM = abs(DP).^2;
figure (1)
imshow(DM)
figure (2)
b = zeros(2048); % b is same with some_image, just with better resolution
b(2048/2-256:2048/2+255,2048/2-256:2048/2+255) = DM(1:2:end,1:2:end);
CD = abs(fftshift(fft2(b))).^2;
imagesc(CD)
axis([2048/2-128 2048/2+127 2048/2-128 2048/2+127])
imwrite(mat2gray(CD),'image.bmp')
The code worked fine but when I try to save the final image, it saved the image that is not axis adjusted. How do I save the executed image with a specified x and y limits?
Thanks,

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