How to remove other color line in graph ?

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Dear All,
I am going to find the way to remove other color line in a image
I try to use threshold but it is not working.
for example this figure bellow. I want to remove red line and keep blue line
Could anyone help me ?
Thank and Regard!
  2 Comments
Jenifer NG
Jenifer NG on 16 Aug 2022
I am starting from an image not a .fig

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Accepted Answer

Walter Roberson
Walter Roberson on 16 Aug 2022
filename = 'https://www.mathworks.com/matlabcentral/answers/uploaded_files/1092850/image.png';
rgb = imread(filename);
mask = rgb(:,:,1) > 128 & rgb(:,:,2) < 200;
newrgb = rgb;
newrgb(repmat(mask,1,1,3)) = 255;
imshow(rgb)
imshow(newrgb)
You might want to make some subtle cleanup.
  1 Comment
Jenifer NG
Jenifer NG on 16 Aug 2022
Edited: Jenifer NG on 16 Aug 2022
Thanks you,
It work !
I learned new function repmat() from your answer

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More Answers (1)

Mandar
Mandar on 16 Aug 2022
I understand that you want to remove one of the lines from the plot.
As a workaround, please use the 'Property Inspector' to delete the plots/lines. Refer to the link below to for more details.
  1 Comment
Jenifer NG
Jenifer NG on 16 Aug 2022
Hi Mandar,
Thanks so much for your information. But I want to remove red line from an image not a .fig.
Sorry for my explaination in question not clear

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