wrong_negative.m

%Nioi Pier Giuliano
%creates negative of grayscale image
%
%function usage
%    imshow(negative(imread('cameraman.tif')));
%
%

function immNeg=wrong_negative(image)
%create output image of the same size as the input image
[rows,cols]=size(image);
immNeg=zeros(rows,cols);

%conversion for working double
%values range in [0,1] , instead of [0,255]
image=im2double(image);

%finding max and min gray level value
max_gray=max(max(image));

%Wrong trasformation
for i=1:rows
    for j=1:cols
        immNeg(i,j)=max_gray - image(i,j);
    end
end

%conversion back to uint8
immNeg=im2uint8(immNeg);