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Change a range of pixel values

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Selina Loh
Selina Loh 2017-10-30
回答： Peter Chang 2017-10-30
Is it possible to change pixel values for pixel values of a certain range? The other pixels will remain the same value.
A(I >= 50 & I <= 110) = 0; I've tried this method but this stores in an array which the image cannot be displayed.

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回答（2 个）

Matteo Sangermani
Matteo Sangermani 2017-10-30
Could you provide an example of the image? Which format are you using? Black-white or RGB? Otherwise is hard to help you
As far as I can see, it looks right. If "I" is your original image, the only recommendation I can give so far is to first initialize A, such as:
A = I;
Peter Chang
Peter Chang 2017-10-30
Suppose X is a n x m-Matrix which contains the pixel values. xmin and xmax are the minimal and maximal value you defined, respectively. And the xnew is the new pixel value you wish to have. You can try:
X(X>=xmin & X<=xmax) = xnew;

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