How change somme values on a matrix?

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for example I have a "A" matrix , i want change somme pixel values inside him, like this example:
if true
% code
if A<=20
How can I do this?!

Accepted Answer

Salaheddin Hosseinzadeh
Salaheddin Hosseinzadeh on 27 Jun 2015
Edited: Salaheddin Hosseinzadeh on 27 Jun 2015
Hi Biza,
It sounds like you want to do thresholding.
A = A>20; % this makes A a logical matrix of 0 and 1, 1 is when A < 20
A = A.*255;
Anyway, this will do the job for you ;)

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