brightness.m

to flip image in matlab

function brightness(val, flag)
global IMG
data=double(IMG);
[m n r]=size(data);
for i=1:m
    for j=1:n
        for k=1:r
        data(i,j,k)=data(i,j,k)+val;
        if data(i,j,k)>255
            data(i,j,k)=255;
        end;
        if data(i,j,k)<0
            data(i,j,k)=0;
        end;
        end
     end
end
res=uint8(data);
if flag==0
imshow(res)
else
IMG=res;
imshow(IMG)
end
end