How can i extract green rectangle area from the rgb image ?

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I have two image. one i take in night and another take in daylight. So i only mask the region where green pixels exists. but problem is that for every image i need to change the value. how can i fix it the same value for all images.
Im = imread('4.jpg');
figure,imshow(Im);
lab = rgb2lab(Im);
figure,imshow(Im);
% Im = imresize(Im, [512 512]);
% figure,imshow(lab(:,:,2));
I1=lab(:,:,2);
I2=lab(:,:,3);
I3=lab(:,:,1);
mask1=I1>-50 & I1<0 ;
mask2=I2>30 & I2<50;
mask =I3 & mask1 & mask2;
% mask=mask1 ;
figure,imshow(mask);
diff_im = im2bw(mask,0.18);
figure,imshow(diff_im);

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Image Analyst
Image Analyst 2017-9-22
Use the Color Thresholder on the Apps tab.

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