We have a image of India, in which Punjab has diffrent colour,
and the rest of part with some another color.
All we have to do is to find the estimated area of punjab.
For this, check RGB values for both color .
An image consists of matrix of pixels.
A pixel is basically a color.
A color is defined by 3 attributes:-
Amount of red, Amount of blue, Amount of green.
Now, put random dots on map, some will fall in punjab others will outside it.
That's it, further is just some calculations needed.
Oh! it's almost equal to area of punjab.