Having issues with loops inside function.

I want to create a function for finding the bounding box of images(rgb). The code works fine when I have it as a part of the main script. But when I implement it as a function it returns the value which I initialized with and not the values computed after the loops are executed. Which is why I have dummy variables and then assigning the return variables with their values. But this doesnt help me either.

[Geoff Hayes]

Balakrishnan - please provide some code so that we can get an idea of what you have attempted and how best to go about solving the problem. Or just provide the function signature and how you are calling this function.

[Balakrishnan Rajan]

function [area,toprow,botrow,leftcol,rightcol] =  ...
                                  impro(image,redval,blueval,greenval)
%UNTITLED Summary of this function goes here
%   Detailed explanation goes here
count=0;
l=0;
r=0;
b=0;
t=0;
for i=1:32 
  for j=1:32
    if((image(i,j,1)==redval)   & ...
       (image(i,j,2)==blueval)  & ...
       (image(i,j,3)==greenval))
      count=count+1;
      if(count==1)
        t=i;
        b=i;
        l=j;
        r=j;
      end
      if(j<l)
        l=j;
      end
      if(i>b)
        b=i;
      end
      if(j>r)
        r=j;
      end
    end
  end
end
area=count;
leftcol=l;
rightcol=r;
toprow=t;
botrow=b;
end

Sorry about that. I thought I had added that as an attachment. It just returns zero for all my outputs. Its like the loops doesnt execute at all.

[dpb]

Have you stepped through with the debugger to check on the logic/values inside the function?

Looks like the loops could be replaced entirely with a suitable use of find and the 'first','last' optional inputs, btw.

[Balakrishnan Rajan]

Sorry, the problem in this case was just that the color isnt exactly a particular value due to a diffuse component of the shade. I understood this only after I saw the image itself with imshow command. Thanks for the help anyways.

PS: I am using the find now. Thanks a lot.

[Balakrishnan Rajan]

I would like to accept your answer but I cant seem to do it. I really appreciate the help. thank you.