Warning: This function is
currently not documented; only the argument list is
available.
Warning: This function is
EXPERIMENTAL. The behaviour of this function, the
name of this function, and anything else documented about this
function may change without notice in a future release of PHP.
Use this function at your own risk.
Negates the colors in the reference image. The Grayscale
option means that only grayscale values within the image
are negated.
Return Values
Returns TRUE on success.
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