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By the middle of the 1920s the cinema had reached a peak of splendour which in certain respects it would never again surpass. It is true that there was not synchronized sound, nor Technicolor, except at a very experimental stage. Synchronized sound was to be introduced at the end of the decade, while Technicolor came into use only in the mid 1930s and beyond. Nor, except in isolated cases like Abel Gance's Napoléon (1927), was there anything approaching the wide screen that audiences were to be accustomed to from the 1950s onwards. It is also the case that viewing conditions in many parts of the world, particulary in rural areas, remained maskeshift and primitive.

Source: The Oxford History of World Cinema EDITED BYGEOFFREY NOWELL-SMITH OXFORD UNIVERSITY PRESS 1996