I am working on an image processing deep learning project using tensorflow. I calculated a brightness bias to add to all pixels of an image and calculated the LoG output of it. However, the sum of all pixel values was approximately the same as it was when I hadn't added the brightness bias.
It would have been drastically different if the LoG was linear in image pixel values since the brightness bias was very large. I just want to confirm that the LoG is supposed to stay the same so I can confirm that I'm not making a mistake elsewhere.