Andrea,
I like the idea but would add that my decision to use png or jpeg also
depends on the type of data, not just transparency. If vectors, like OSM,
then png looks much better. If raster, then jpeg is typically fine.
I have also thought about a similar concept when exposing tiled layers to
our applications. Its more of a configuration issue, but we always
pre-configure layers in our apps. It tends to become a hassle for
developers to know which format the layer is available in. I usually only
publish tiled layers in 1 particular format based on the decision above. It
would be nice if there was an alias that could be used which basically
means either/or, since web clients don't really care. This would probably
be more of a GWC feature.
Jason Newmoyer
Newmoyer Geospatial Solutions
843.606.0424
[email protected]
On Tue, Jun 7, 2016 at 12:50 PM, Andrea Aime <[email protected]>
wrote:
> Hi all,
> when working with imagery it happens often enough that one wants the
> compression
> factor of a JPEG, but also transparency at the raster data edges.
> Unfortunately one cannot have both... or can she?
>
> With tiled maps we can introduce a new output format, which I nicknamed
> JPENG
> (JPEg or pNG) that would return the right compression depending on the
> tile content:
> if it's fully opaque, JPEG, if there is any transparency, PNG instead, of
> course setting
> the right return type headers so that the browser can do the right
> decoding.
>
> It's simple enough and would save significant bandwidth (and also CPU,
> JPEG is
> faster to compress) for imagery that also needs occasional transparency
> support.
>
> I'd add this at a WMS output format, and if time allows, WMTS too... but
> no guarantees,
> I have actually no funding backing any of this (I'm doing it for another
> system), but it seems
> quick to implement in GeoServer too and would be a pity to lose it.
>
> Objections? Suggestions for a better name (I checked a few other variants,
> but they seem to be
> already in use on the internet with a different meaning)?
>
> Cheers
> Andrea
>
>
> --
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