Andrea,
Thanks for your reply, so i will propose this API change and code this by
myself. After it i do the proposal for the developer team.
2017-08-23 5:16 GMT-03:00 Andrea Aime <[email protected]>:
> 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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