how to convert a gray level to another gray level in matlab?

Question

fariba amini 2016-4-4

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https://ww2.mathworks.cn/matlabcentral/answers/276990-how-to-convert-a-gray-level-to-another-gray-level-in-matlab

评论： fariba amini 2016-4-4

i have an gray scale image.i want to change some gray level to another gray level.for example i want to convert all pixel with value 128 to 0 ,how can i do this?

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Answer 1

Walter Roberson 2016-4-4

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https://ww2.mathworks.cn/matlabcentral/answers/276990-how-to-convert-a-gray-level-to-another-gray-level-in-matlab#answer_216315

在 MATLAB Online 中打开

my_image =imread('YourImage.tif');
my_image(my_image == 128) = 0;

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fariba amini 2016-4-4

thank you so much.it works correctly.thanks again

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Answer 2

Muhammad Usman Saleem 2016-4-4

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/276990-how-to-convert-a-gray-level-to-another-gray-level-in-matlab#answer_216314

在 MATLAB Online 中打开

my_image =imread('YourImage.tif');
for R=1:num of Rows
    for C=1:num of Columns
        pixel=my_image(R,C);
        if pixel ==128
        pixel=0;
    end
end