Separate red tumor from image by using RGB

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Emir Kulakoglu
Emir Kulakoglu 2019-11-3
编辑： Emir Kulakoglu 2019-11-4
I have to separate red tumor from the image by using thresholding approach while creating the mask I found some functions related to it but I didn't run the codes. I just wrote that and the image is there:
clear all;clc
a=imread('mri_img.png');
imshow(a);
red=a(:,:,1);
green=a(:,:,2);
blue=a(:,:,3);
subplot(2,2,1),imshow(a)
subplot(2,2,2),imshow(red)
subplot(2,2,3),imshow(green)
subplot(2,2,4),imshow(blue)
newcg=green>70;
newcb=blue<30;
newcg=~newcg;
MaskImage =newcg&newcb;
MaskImage = double(MaskImage);

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采纳的回答

Image Analyst
Image Analyst 2019-11-3
Is the image a simple pseudocolor of a grayscale image? If so, do you have the original image? Or do the colors represent something different than grayscale?
Please see my attached demos.

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