Hi Simone,
If I understand well your message, you are working on the SLD support for
rasters rendering customization. As it is a subject which interests me a lot
(as you know ;-)), I would like to answer you, event if I am probably not
the best person to do it.
I just think that the last solution is really not the best one. Even if it
is temporary, I think everything is better than having a "crash"... I can't
understand well the two other options, so I don't say anything about them !
Thomas
PS : when do you think GT will be able to apply a SLD to rasters
approximately ?
2008/4/3, Simone Giannecchini <[EMAIL PROTECTED]>:
>
> Hy guys,
> I am slowly moving towards the end of the refactor for the SLD 1.0
> RasterSymbolizer work we have put together for geotools and geoserver.
> There is however an issue on which I would like to have some feedback
> from the community.
> Inside the streaming renderer we usually draw on an ARGB
> BufferedImage, which is the place where we fuse images taken from
> rendering different layers. Now the RasterSymbolizer strives to
> produce an ARGB or AGray image, but still there can be some
> combinations for the RasterSymbolizer elements for which we can get
> images that have like 7 bands or images with just one band but with
> negative values. Well, java2d chocked when you try to overlay pixels
> with negative values on an RGB image (things are a little bit more
> complex than that, but anyway, if anyone is interested he can find
> more info online).
>
> My question is the following. How would like this situation to be
> handled ?(if you think we should handle it at all, alternative is just
> let java2d spit an obscure exception and have users come back to us
> with strange questions :-)).
>
> During years I hve used various various solutions in other projects:
>
> 1>select 1-2 (gray or gray alpha) or 3-4 (rgb or rgba) bands then clamp
> to byte
> 2>select 1-2 (gray or gray alpha) or 3-4 (rgb or rgba) bands the
> autorescale to byte (do a linear mapping from the original image range
> to a byte range)
> 3> choke with a nice message
>
>
> Preferences? Different approaches?
>
>
>
> Thx,
> Simone.
> --
> -------------------------------------------------------
> Eng. Simone Giannecchini
> President /CEO GeoSolutions S.A.S.
> Via Carignoni 51
> 55041 Camaiore (LU)
> Italy
>
> phone: +39 0584983027
> fax: +39 0584983027
> mob: +39 333 8128928
>
>
> http://www.geo-solutions.it
>
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