how to xor image to 255 value?

Hai, aa= imread('lena.bmp')

next how i xor the 'aa' to value 255?

aa xor 255

[juveria fatima]

how can xor first pixel with second and second with third and so on (for binary image)

[Image Analyst]

juveria, you've already accepted an answer to that here in this link

Answer 1

[Image Analyst]

Did you try the xor() function?

grayImage = imread('moon.tif');
subplot(1,2,1);
imshow(grayImage);
output = xor(grayImage, 255);
subplot(1,2,2);
imshow(output)