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Basic number problem

Hi, new to this forum and quite the novice at MatLab. Anyway, I am trying to analyze the RGB of images. I made some quick code to look at three squares of one image, taking the sum of each RGB. However, the matrix results are always 255. I read that in MatLab I don't have to declare variable types, but something isn't right; the numbers should be much larger. Here's the code:
[code]clear
t='c:usersmy.selfdesktop estIMG_0001.jpg';
h=[700, 1020, 1450];
v=1700;
rcol=0;
gcol=0;
bcol=0;
mag=zeros(3);
q=imread(t);
for i=1:3
ybeg=h(i);
for x=v:v+50
for y=ybeg:ybeg+50
rcol=q(x,y,1);
gcol=q(x,y,2);
bcol=q(x,y,3);
mag(i)=mag(i)+rcol+gcol+bcol;
end
end
end
[/code]

So looking at 50x50 grids. Any ideas? Thanks.
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