MATLAB: How to replace the pixel value

change the pixel valueMATLAB

hello i have a question that how to replace the pixel value with other pixel value

Just assign the value: For pixel (i,j), given a RGB image (n x m x 3 matrix):

p(i,j,:) = [0.2 0.4 0.5];

You could dilate the mask to make it bigger or use the distance transform to identify pixels within n pixels of your mask.

doc imdilate
doc bwdist

roi = repmat(binaryImage, [1,1, size(origImage,3)]);
origImage(~roi) = 0;
max(origImage(roi))
min(origImage(roi))