Making some intensity values of image to zero

hi..

How to zero the unwanted pixel intensity values of a image to zero.

Answer 1

[Stephen]

if your image is 'a', try

a(a>threshold)=0;

or try

max(a,threshold);

which makes the values equal to your threshold. maybe it is useful

[Walter Roberson]

The reverse, values less than the threshold are the ones to be set to 0 apparently.

Answer 2

[Walter Roberson]

... Assign 0 to those matrix locations ?

Is there more to this question, such as automatically determining which pixels have "unwanted pixel intensity values" ?

[Gova ReDDy]

Yeah,I'm planning to give some threshold like pixel intensity values less than 30 should be equal to zero in the image.