Super Mario Galaxy contains an unused texture for a painting to be used inside the mansion in Ghostly Galaxy (left). In the Nintendo Switch version, the texture was actually remade instead of upscaled (right), even though it remains unused.
Whether it was redrawn manually or this is a result of a program filling in new details automatically is unknown, though Nintendo is not currently known to have a record of using such methods to create new details in textures.
Source: CometMedal, Rosalinda, Matercula
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