function [imout]=stretch(imagein)



s=size(imagein);

imagein=double(imagein);

imout=zeros(s(1),s(2));

a=min(imagein(:));%find min and max pixel values to determine stretch constants

b=max(imagein(:));



imagein = (imagein > a).*imagein;%set values less than a to zero

imagein = (imagein >= b)*255+(imagein<b).*imagein;%set values more than b to 255

imout = uint8(255*(a-imagein)/(a-b));%do the stretch