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          Color - Elements of Cinematic Expression
Since its introduction  in 30s color adds on realism and glamour in film.
Apart from this, Color enables filmmakers to relate to emotional content of the Scene.

In "Juliet of the Spirits"  (Fellini, 1965) Gianni di Venanzo (cinematography) very eloquently uses color scheme to separate worlds of Reality and
Fantasy as subjectively experienced by Juliet.
Colors do not necssarily carry exlusive meanings and their choices seem to be opened to subjective interpretation.
Zhang Yimou ("Ju Dou" 1990) exploits Red to delineate passion, whereas Bergman's choice of Red in "Cries and
Whispers" (1972) is used as a metaphore of  "enforced" stagnation.
"Cries and Whispers" 1972
"Ju Dou"  (1990)
Three times  Oscar winner  Victorio Storaro exercises interesting approach to color, where he seeks  correlation  of
levels of counsciousness and stages of life with Colors of Chakra.
In "Last Emperor" (1987) Storaro symbolizes different stages of Emperor's life with Colors of Chakra.
Storaro in his own words:
Red is the color of the Beginning. When the Emperor  cuts his
veins he sees Red Blood that reminds him of his first color
experience as a newborn Emperor.
Orange is the color of Family. It is  the color of Forbidden City
which Emperor associates with Warmth and maternal
embrace.
Yellow is the color of Identity. It represents Imperial Status in the
mind of young emperor. Yellow symbolizes the Sun itself.
Green is the color of Knowledge. We see green for the first
time when  tutor comes to Forbidden City. Color Green
symbolizes Knowledge that is to empower young emperor.