how to manipulate image pixels

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Sams 2014-5-9

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https://ww2.mathworks.cn/matlabcentral/answers/128980-how-to-manipulate-image-pixels

回答： Image Analyst 2014-5-9

Hi everyone I've got an image and now i'd like to change some pixelvalues. e.g i'd like to change all values to 0 which are below a certain limit. I thought to give it a try with a for loop but so far it didn't work. Please, i am totally new to matlab. cheers Sams

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Answer 1

Image Analyst 2014-5-9

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https://ww2.mathworks.cn/matlabcentral/answers/128980-how-to-manipulate-image-pixels#answer_136201

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Make a binary image mapping out the pixels less than some threshold and then use that as a logical index to set them to zero:

thresholdValue = 100; % Or whatever you want
belowThreshold = grayImage < thresholdValue; % Create binary image.
% Make a copy that will be masked.
newImage = grayImage; % Create a copy.
newImage(belowThreshold) = 0; % Assign them to zero.