Alpha blending details?

[Philipp K. J. <ja...@ie...>]

What blending mode or operator does gnuplot
use for alpha blending?

According to this page, there are many possible
choices:
	http://cairographics.org/operators/

Based on some tests, possible options seem to be 
OPERATOR_OVER, OPERATOR_ADD, and OPERATOR_SATURATE.

Does anyone know?

Best,

		Ph.