Hi Danilo,
as far as I know there is no support for alpha channel in there.
You'll have to make a code extension in GeoTools, which might not be simple
since the current API,
derived from the SLD spec, goes like this:
/**
* Set the RGB channels to be used
*
* @param red the red channel
* @param green the green channel
* @param blue the blue channel
*/
void setRGBChannels(SelectedChannelType red, SelectedChannelType green,
SelectedChannelType blue);
/**
* Set the RGB channels to be used
*
* @param channels array of channels in RGB order
*/
void setRGBChannels(SelectedChannelType[] channels);
and all the code dealing with style parsing, encoding and rendering has
enumerations or explicit mentions
of "red", "green" and "blue".
So public API breaking seems to be necessary, which implies that you'll
have to make a proposal and restrict
the code changes to the developer series:
http://docs.geotools.org/latest/developer/procedures/proposal.html
Hope this helps (even if it's probably not what you wanted to hear :-p )
Cheers
Andrea
On Tue, Aug 22, 2017 at 8:41 PM, Danilo da Silveira Figueira <
[email protected]> wrote:
> 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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--
Regards,
Andrea Aime
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