Separate red tumor from image by using RGB

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);

Answer 1

[Image Analyst]

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.

[Emir Kulakoglu]

There is the file

[Image Analyst]

Try the Color Threshold App on the Apps tab of the tool ribbon. Use HSV color space.

Or see my file exchange: click here for my File Exchange

[Emir Kulakoglu]

Thankk youu !! I will try again