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.
Applies a special effect to the image, similar to the effect achieved
in a photo darkroom by sepia toning. Threshold ranges from 0 to
QuantumRange and is a measure of the extent of the sepia toning. A
threshold of 80 is a good starting point for a reasonable tone.
Return Values
Returns TRUE on success.
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