I want to take R, G, B color components of an pixel by logical indexing, check channel values, and create new binary image but error occures at the command related with logical indexing

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denisa 2020-4-8

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https://ww2.mathworks.cn/matlabcentral/answers/516325-i-want-to-take-r-g-b-color-components-of-an-pixel-by-logical-indexing-check-channel-values-and

评论： denisa 2020-4-8

I want to take a RGB image, read it and hold it as an matrix, extract color components R, G, B as R=arr(:,:,1), G=arr(:,:,2) and B=arr(:,:,3). Then I want to create new matrix -image- by pay attention to channel values. For example; if R value is greater than 50 and G value is lower than 20 and B value is lower than 165 I make the pixel value at this location to 1, otherwise 0. And I want to access pixels by logical indexing. To achieve this, I run the command given below. But at the third command -logical indexing related- an error occurs "Operands to the || and && operators must be convertible to logical scalar values. " How can I fix this problem friends, thank you in advance.

arr=imread('image.jpg');

binaryImage = zeros(size(arr,1),size(arr,2));

binaryImage( (arr(:,:,1)>50) && (arr(:,:,2)<20) && (arr(:,:,3)<165)) = 1;