Simone,
I've gone with the approach to right now implement this as a rendering
transformation.  I took this approach because it is less invasive than the
other approaches and the operation can easily used as a raster process and
SLD.  Let me know if you have any concerns.

Thanks,

John Schulz

On Thu, Aug 3, 2017 at 8:18 AM, Simone Giannecchini <
simone.giannecch...@geo-solutions.it> wrote:

> Chiming in late.
>
> My suggestions would be as follows:
> - implement the operation in the ImageWorker. Most/All the logic
> should stay here.
> - Add a new contrast enhancement
>
> Adding a rendering transformation later on for whatever reason would
> be very easy.
>
> That said, if you want to have full performance you might have to go
> down to implement the operation directly in JAI/JAI-Ext rather than
> combining various JAI operations; however, this is another story..
>
> Regards,
> Simone Giannecchini
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> On Thu, Jul 20, 2017 at 7:10 PM, Torben Barsballe
> <tbarsba...@boundlessgeo.com> wrote:
> >
> >
> > On Thu, Jul 20, 2017 at 12:06 AM, Ian Turton <ijtur...@gmail.com> wrote:
> >>
> >> I think that how you expose this to the user depends on what you or they
> >> think the process is going to be used for.
> >>
> >> I lean towards the rendering transformation as I see it as a process to
> >> transform a raster into another one rather than an enhancement of the
> >> raster. But I'm not a raster expert and I've never come across this
> type of
> >> transformation before.
> >>
> >
> > To provide a bit of an alternate viewpoint, in the places I have seen
> > hue-rotate used it has been the same type of operation as
> > brightness/contrast or changing the saturation. This has generally not
> been
> > in a GeoSpatial context however, just general image transformations.
> >
> > Given that we are using a ContrastEnhancement for brightness / contrast,
> I
> > could completely understand using a similar Color Enhancement for hue
> > rotate.
> >
> > That said, I'm sure a rendering transform would be fine too.
> >
> > Torben
> >
> >
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