Hi,
I would remember image/mixed easier. But will there be need for other mixtures later?
-Jukka Rahkonen-
Andrea Aime 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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Ing. Andrea Aime
@geowolf
Technical Lead
GeoSolutions S.A.S.
Via di Montramito 3/A
55054 Massarosa (LU)
phone: +39 0584 962313
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