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How would I go about running trough an RGB image and turning all pixels with R >200 to white?

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James ANDREW
James ANDREW on 20 Feb 2018
Answered: Arun Mathamkode on 23 Feb 2018
Fairly new to working with images and I have been scrounging the net but can't seem to find anything simple to understand. All I want to do is remove the background of an image which is all a singular color from and image and just either make it black or white.
I really just don't understand how to move through step by step of a 3d array when the third element is 3 values on its own...

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Answers (1)

Arun Mathamkode
Arun Mathamkode on 23 Feb 2018
You can use logical indexing. First, find a logical map to find the pixels locations (R>200) and use this logical map for logical indexing. if I is 3D matrix representing the image,
map=I(:,:,1)>200;
I(map(:,:,[1,1,1]))=0;

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