how to set all pixels in the range (100 , 190) to 40 for some picture called "school" ??

how to set all pixels in the range (100 , 190) to 40 for some picture called "school" ?? , plz i need full code for doing that

Answer 1

[Iain]

If you mean pixel levels in that range:

 school(school > 100 & school < 190) = 40;

[Maria]

i meant the matrix array pixel values ,can u help me

[Iain]

Have you tried my code?

Answer 2

[Walter Roberson]

school = imread('school.tif');

school(school > 100 & school < 190) = 40;

imshow(school)

Answer 3

[Image Analyst]

Try

school(school >= 100 & school <= 190) = 40;

Same as the others had but since 100 and 190 are in the range I used the = sign whereas the others didn't so pixels with values of 100 and 190 will not get set to 40 in their answers.