On Fri, May 11, 2012 at 3:58 PM, MWilson Matthew <[email protected]> wrote:
> Good morning,****
>
> I’ve been searching the documentation and the mailing list archive but
> haven’t found an answer yet.****
>
> ** **
>
> When I specify the output of the WMS as image/jpeg, what are the
> specifics to what kind of compression is used on those images? With my
> raster imagery, it’s about a 9x reduction in size from png to jpeg, but I’m
> wondering if we have any control over some jpeg compression parameters such
> as subsampling, chrominance and luminance.
>
The only control you have is the level of compression, specified in the WMS
service page.
The JPEG encoder provided by Java and/or JAI Image I/O does not allow to
control
extra parameters, though having enough resources it should be possible to
write a custom
jpeg encoder, based on low level C libraries, that allows to expose said
parameters to the
caller and/or the administrator.
Cheers
Andrea
--
Ing. Andrea Aime
GeoSolutions S.A.S.
Tech lead
Via Poggio alle Viti 1187
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Italy
phone: +39 0584 962313
fax: +39 0584 962313
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