Program for Negative of Image Using Matlab

 Program for Negative of Image Using Matlab

A negative image is a total inversion, in which light areas appear dark and vice versa.
In negative transformation, each value of the input image is subtracted from the L-1 and mapped onto the output image.In this case the following transition has been done.
s = (L – 1) – r
Assuming the input image be 8 bit image , so the number of levels in this image are 256. Putting 256 in the equation, we get this,
s = 255 – r
So each value is subtracted by 255 and the result image has been shown above. So what happens is that , the lighter pixels become dark and the darker picture becomes light. And it results in image negative.

Program for Negative of Image 

clc;

clear all;

a=imread('D:\sample.jpg');

b=rgb2gray(a);

c=double (b);

d=255;                           % for a 8-bit image %

e=d-c;

figure(1)

colormap(gray)

imagesc(b)

title('Original Image')

figure(2)

colormap(gray)

imagesc(e)

title('Negative Image')

OUTPUT: