[mapserver-dev] Fwd: Considering a new WMS/WMTS output format: jpeg or png (JPENG for friends)

thomas bonfort thomas.bonfort at gmail.com
Tue Jun 7 10:58:58 PDT 2016

We might consider adding to mapserver if there's a need for it. FWIW, this
feature has been in mapproxy since end of 2012, and mapcache since mid 2011.

On 7 June 2016 at 19:32, Jeff McKenna <jmckenna at gatewaygeomatics.com> wrote:

> Forwarding interesting idea on the GeoServer-devel list.  Seems like
> something that would interest MapServer-ers serving through WMS as well.
> -jeff
> -------- Forwarded Message --------
> Subject:        [Geoserver-devel] Considering a new WMS/WMTS output
> format: jpeg or png (JPENG for friends)
> Date:   Tue, 7 Jun 2016 18:50:02 +0200
> From:   Andrea Aime <andrea.aime at geo-solutions.it>
> To:     Geoserver-devel <geoserver-devel at lists.sourceforge.net>
> 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
> (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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