Image detect and convert white image
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![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1015940/image.png)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1015930/image.png)
I want to convert like this,,,, detect image and convert in to whole white, because i have to count white pixels
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Walter Roberson
le 30 Mai 2022
filename = 'https://www.mathworks.com/matlabcentral/answers/uploaded_files/1015940/image.png';
img = imread(filename);
negmask = all(img > 240, 3);
mask = ~bwareafilt(negmask, 1);
imshow(mask)
area = nnz(mask)
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Walter Roberson
le 30 Mai 2022
The 240 that I chose was arbitrary. When I filtered for any component < 240, a small number of small dots were left near the lower right of the object. The bwareafilt is used to select just the largest area, discarding the small dots.
KSSV
le 30 Mai 2022
I = imread('https://in.mathworks.com/matlabcentral/answers/uploaded_files/1015935/test.png') ;
I1 = rgb2gray(I) ;
I2 = ~imbinarize(I1) ;
imshow(I2)
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