Does the while (1) {...} loop always terminate? I am not entirely sure about it and would like to hear some opinions. What if the first guess is already the bes

Does the while (1) {...} loop always terminate? I am not entirely sure about it and would like to hear some opinions. What if the first guess is already the best possible solution? Could there be any pictures that cause trouble? I.e. ones that consist of 4 (equally spaced) colors only.