after if condition the value is not assigning, the default value 255 is coming

% seeded region growing algorithm %

clear all; clc;

 I = imread('7.jpg');
 Is = imresize(I,[256 256]);
 Ig = rgb2gray(Is);

 impixelinfo(imshow(Ig));

 % determine how many clusters for an image %

c1 = 300; c2 = 500; c3 = 600;

 %determine how many seed points u reqire%

 p1 = 228;
 p2 = 198;
 p3 = 100;

 %difference of pixel values of seed point to neighbouring pixels%

 for i =1:256
     for j =1:256
         if abs(p1 - Ig(i,j)) <= 5
               Ig(i,j) = 300;
         elseif abs(p2 -Ig(i,j)) <= 5
                   Ig(i,j) = 600;
         else
             Ig(i,j) = 700;

         end

     end

 end

Answer 1

[Image Analyst]

This is not seed growing - nothing is growing. You are quantizing, which you can do like this without a loop

outputImage = 700 * ones(256,256, 'uint32'); % Initialize to all 700.
binaryImage = Ig >= (p1-5) & Ig <= (p1+5);
outputImage(binaryImage) = 300;
binaryImage = Ig >= (p2-5) & Ig <= (p2+5);
outputImage(binaryImage) = 600;

I have no idea where 255 is coming from - you don't even have a 255 in your code at all!

[Datti Nagadhara Harini]

thank u very much. i solved it