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1.) They are flipped like the negative and the positive are opposite of each other.

2.) Definition of negative: A negative image is a total inversion of a positive image, in which light areas appear dark and vice versa. A negative color image is additionally color reversed, with red areas appearing cyan, greens appearing magenta and blues appearing yellow.
noting an image in which the brightness values of the subject are reproduced so that the lightest areas are shown as the darkest.