图像处理基础问题,求解答。
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代码如下:只是简单的图像灰度化及显示
x=imread('秋之柱号.jpg');
I=rgb2gray(x);
set(0,'defaultFigurePosition',[200,200,1000,500]);
set(0,'defaultFigureColor',[1 1 1]);
set(gcf, 'InvertHardCopy', 'off');
BW1=im2bw(I,0.45);
BW2=im2bw(I,0.6);
subplot(221),imshow(BW1);
subplot(222),image(BW2);
subplot(223),image([80,100],[90,170],x);
subplot(224),imagesc(I,[10,150]);
但是显示出来的灰度图像为什么会带颜色?
谢谢

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