Hi all,

I see that the property ChannelSelection has only RGB channels, i need to
use all the RGBA channels.

In fact in my image the AlphaChannel is an important information too. And
each cell has one different value, so because this i cant use things like
RAMP/VALUE colormap.

It is possible to use something like <AlphaCHannel> in sld? If don't, can i
do this by implementing a geoserver extension?

i will have to
How can i do this?
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