g=imread('peppers.png');
imshow(g)
figure

imshow(255-g)
??? Error using ==> -
Function '-' not defined for variables of class 'uint8'.

imshow(uint8(255-double(g)))
imshow(255-double(g))
delfigs
imshow('mart.png')
edit contrst
contrst
profiles

figure(1)
profiles


stretchi
stretch(5,25)
stretch(60,90)
delfigs
g=imread('peppers.png');
imhist(g)
g=imread('mart.png');
imhist(g)
figure
imshow(g)
f=imhist(g);
whos f
  Name      Size           Bytes  Class

  f       256x1             2048  double array

Grand total is 256 elements using 2048 bytes

figure
plot(f)
h=cumsum(f);
figure
plot(h)
plot(h/length(g(:)))
plot(255*h/length(g(:)))
delfigs
heqdemo
exit