[Qgis-developer] QGIS Server - WMS GetMap Jpeg compression
kimaidou at gmail.com
Mon May 26 08:22:54 PDT 2014
Thanks for the reply
I created an issue : http://hub.qgis.org/issues/10361
I agree with you that a parameter per project is enough.
2014-05-26 17:12 GMT+02:00 Marco Hugentobler <
marco.hugentobler at sourcepole.ch>:
> Hi Michael
> At the moment, the compression rate is left to the Qt library both for png
> and jpeg (-1 is given to QImage::save). I agree it will be usefull to
> change from client or from project.
> >Why not
> >FORMAT=image%2Fjpeg%3B compression%3D90
> >I guess it is not standard ?
> The problem here is that there has to be a new parameter for each
> compression rate. It might be better to have the possibility to configure
> the image quality in the project or by giving an optional parameter for the
> image quality (0-100 as the Qt parameter). So if the parameter is not
> there, the project setting is used. And if the setting is not set, -1 is
> used as it is now.
> On 23.05.2014 18:44, kimaidou wrote:
> Or even better, having it layer per layer. Like we do for png , for
> FORMAT=image%2Fpng%3B mode%3D8bit -> image 8 bits
> Why not
> FORMAT=image%2Fjpeg%3B compression%3D90
> I guess it is not standard ?
> 2014-05-23 18:36 GMT+02:00 Paolo Cavallini <cavallini at faunalia.it>:
>> Or even better, having a config at runtime, project by project.
>> On 23 maggio 2014 18:33:00 CEST, kimaidou <kimaidou at gmail.com> wrote:
>>> Hi devs, Marco, René-Luc,
>>> I have some people giving feedback about the current JPEG compression.
>>> Many users think the "FORMAT=image/jpeg" parameters in the GetMap requests
>>> produce poor quality images.
>>> I guess the "80%" rate is used. I think it could be enough to increase
>>> it to 90 to produce better looking images (I personaly create my pyramid
>>> with this option with gdal), or better to leave the choice when installing
>>> QGIS Server by using a config parameter.
>>> Any feedback welcome
>>> Qgis-developer mailing listQgis-developer at lists.osgeo.org
> Qgis-developer mailing listQgis-developer at lists.osgeo.orghttp://lists.osgeo.org/mailman/listinfo/qgis-developer
> Dr. Marco Hugentobler
> Sourcepole - Linux & Open Source Solutions
> Weberstrasse 5, CH-8004 Zürich, Switzerlandmarco.hugentobler at sourcepole.ch http://www.sourcepole.ch
> Technical Advisor QGIS Project Steering Committee
> Qgis-developer mailing list
> Qgis-developer at lists.osgeo.org
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