Some Random effects using matlab

• Negative Image

Subtract 255 from the RGB image, to obtain negative image.
MATLAB CODE:
%Here the  I am subtracting 255 from R,G and B.
A=imread('person.jpg');
imshow(255-A);

Original Image

Negative Image

• Sine Wave
  
  First find the mid point of the RGB image.
  Convert the points from Cartesian to polar co_ordinates
  Find the sine value for the angle 'theta'
  Again convert the points to Cartesian co_ordinates
  
  SAMPLE CODE:
  x2=zeros([size(A,1) size(A,2)]);
  y2=zeros([size(A,1) size(A,2)]);
  for i=1:size(A,1)
      x=i-midx;
      for j=1:size(A,2)
  %Cartesian to Polar co-ordinates
             [theta1,rho1]=cart2pol(i,j-midy);
      
        
                
          phi=sin(theta1);
        
  %Polar to Cartesian co-ordinates
          [l,m]=pol2cart(phi,rho1);
          x2(i,j)=ceil(l)+midx;
          y2(i,j)=ceil(m)+midy;
        
      end
  end
  
  

  

  Sine wave

  
  

Original Image