how to divide rgb image into blocks using for loop and find the rgb value for each block

bs=8;
% M=zeros(96,96,3);
 row=r/bs;
 col=c/bs;
a=1;
k=0;
l=0;
b=1;
p=1;
noofp=96;
mR=zeros(768,768);
mG=zeros(768,768);
mB=zeros(768,768);
while(p<=noofp)
for i=1:row
    for j=1:col
     M{p}=re(8*k+1:8*a,8*l+1:8*b,:);
       mR=M{p}(i,j,1);
       mG=M{p}(i,j,2);
       mB=M{p}(i,j,3);
       d=[mR mG mB];

      p=p+1;
      l=l+1;
      b=b+1;
      end
      k=k+1;
      a=a+1;
      l=0;
      b=1;
  %     figure,imshow(M{p});
  end

Answer 1

[KSSV]

bs=8;
M=rand(768,768,3);
[r,c,p] = size(M) ;
row=r/bs;
col=c/bs;

mR=M(:,:,1);
mG=M(:,:,2) ;
mB=M(:,:,3) ;

idx = 1:bs:r+bs ;
pos = [idx(1:end-1)' idx(2:end)'-1] ;

iwant = zeros(bs,bs,row) ;

for i = 1:row
    iwant(:,:,i) = mR(pos(i,1):pos(i,2),pos(i,1):pos(i,2)) ;
end

[vasantha malairamar]

Subscripted assignment dimension mismatch.

a=imread('Fig1(a).jpg');
% re=imresize(a,[768 768]);
% [r,c,numberofpixels]=size(re);
M = imresize(a, [768 768]);
% [r c]=size(J);
bs=8;
 M=rand(768,768,3);
[r,c,p] = size(M) ;

row=floor(r/bs);
col=floor(c/bs);
disp(row);
disp(col);

      mR=M(:,:,1);
      mG=M(:,:,2);
      mB=M(:,:,3);

idx = 1:bs:r+bs ;
pos = [idx(1:end-1)' idx(2:end)'-1] ;

iwant = zeros(row,col) ;

for i = 1:row

      iwant(:,:,i) = mR(pos(i,1):pos(i,2),pos(i,1):pos(i,2)) ; 

end

[KSSV]

Attach the image Fig1(a).jpg. Can be sorted not a deal.

[vasantha malairamar]

[vasantha malairamar]

In above code how to find rgb value in each pixel using for loop..

[KSSV]

M = imread('Fig1(a).jpg') ;

bs=8;
[r,c,p] = size(M) ;
row=r/bs;
col=c/bs;
mR=M(:,:,1);
mG=M(:,:,2) ;
mB=M(:,:,3) ;

idx = 1:bs:r+bs ;
idy = 1:bs:c+bs ;
posx = [idx(1:end-1)' idx(2:end)'-1] ;
posy = [idy(1:end-1)' idy(2:end)'-1] ;
% extracting RED
iwant = cell(row,col) ;
for i = 1:row
    for j = 1:col
        iwant{i,j} = mR(posx(i,1):posx(i,2),posy(j,1):posy(j,2)) ;
    end
end

[vasantha malairamar]

tnk u....

[vasantha malairamar]

whether 96 represents the pixel value or the band??