Superposition de calques monochromes d'opacit\'es variables

Abstract

For a monochrome layer x of opacity 0 ox1 placed on another monochrome layer of opacity 1, the result given by the standard formula is ( C)=1+Σn=12(2-n-(-1)no(+1))((n+-1)-o(n+-1)), the formula being of course explained in detail in this paper. We will eventually deduce a very simple theorem, generalize it and then see its validity with alternative formulas to this standard containing the same main properties here exposed.

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