Nyquist sampling theorem states that "a signal's sample rate must be at least twice the signal's bandwidth to avoid aliasing".

Computer screen has a resolution of 1920 x 1080, and has ~360 x 360 pixels crossing over the interferogram (black square) in the big photo picture shown below. Then I reduce the photo picture size and post it again, there are now ~80 x 80 pixels crossing over the black square, Aliasing (small circles and rings) in the interferogram is severe.