i = imread('C:\Programas\MATLAB71\work\Ensaios Mestrado - 05.05.08\Imagens 2ºparte Trabalho\18.01.09 - Testes\leds p800 II.jpg');
igray1 = rgb2gray(i);
figure(1)
imshow(igrgay1);
figure(2)
imhist(igray1);

ivalmax = imtophat(ireduzida,se);
iajust = imadjust(ivalmax,[0 0.5],[]);

i = imread('C:\Programas\MATLAB71\work\Ensaios Mestrado - 05.05.08\Imagens 2ºparte Trabalho\18.01.09 - Testes\030209 L AGUA RL P800 c.jpg');
igray2 = rgb2gray(i);
figure(3)
imshow(igrgay2);
figure(4)
imhist(igray2);