Rendered or created in duotone; having exactly two colors or tones.
From duotone + -ed (a suffix forming past participles and adjectives). A duotoned image is one that has been processed into a two-color format.
A duotoned image has a specific aesthetic—it's deliberately limited, which paradoxically makes it feel more artistic than a full-color photo, and it's why vintage album covers and modern Instagram filters love this effect.
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