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image opacity/image overlaying?

• To: mathgroup at smc.vnet.net
• Subject: [mg80133] image opacity/image overlaying?
• From: AV <akvelu at gmail.com>
• Date: Mon, 13 Aug 2007 04:36:55 -0400 (EDT)

Is there a way of overlaying a partially transparent 2D image array on
another 2D image array using ArrayPlot or ListDensityPlot?  I am
currently using a workaround by making an array of transparent points
and showing this on top of a ListDensityPlot graphics but I wanted to
check if there was a better way since this is very slow.

AV