Modernism
” Modernism was generally based on idealism and a utopian vision of human life and society and a belief in progress. It assumed that certain ultimate universal principles or truths such as those formulated by religion or science could be used to understand or explain reality. Modernist artists experimented with form, technique and processes rather than focusing on subjects, believing they could find a way of purely reflecting the modern world. ”
Modernism in art and photography was very showing things and portraying scenes in the way the photographer / artist thought they
Post-Modernism
“Post-Modernism collapsed the distinction between high culture and mass or popular culture, between art and everyday life. Because postmodernism broke the established rules about style, it introduced a new era of freedom and a sense that ‘anything goes’. Often funny, tongue-in-cheek or ludicrous; it can be confrontational and controversial, challenging the boundaries of taste; but most crucially, it reflects a self-awareness of style itself.”