[Qgis-developer] QGIS Server - WMS GetMap Jpeg compression

[kimaidou]

Hi all

I just sent a pull request to allow configure the JPEG compression for
getMap requests :

* with a new configuration in the Project properties dialog / OWS Server /
WMS capabilities : this is used as a default value if found. If not found
(older QGIS), -1 is used as before
* with an optionnal request parameter IMAGE_QUALITY . If passed and valid,
it overrides the project configuration.

Please review and comment : https://github.com/qgis/QGIS/pull/1403

Regards

Michael


2014-05-26 17:22 GMT+02:00 kimaidou <kimaidou at gmail.com>:

> Hi Marco,
>
> 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.
>
> Regards,
> Michael
>
>
> 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.
>>
>> Regards,
>> Marco
>>
>>
>> On 23.05.2014 18:44, kimaidou wrote:
>>
>>  Or even better, having it layer per layer. Like we do for png , for
>> example
>> 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
>>>>
>>>>  Michael
>>>>
>>>> ------------------------------
>>>>
>>>> Qgis-developer mailing listQgis-developer at lists.osgeo.org
>>>> http://lists.osgeo.org/mailman/listinfo/qgis-developer
>>>>
>>>>
>>> --
>>> http://faunalia.eu/
>>>
>>
>>
>>
>> _______________________________________________
>> 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
>>
>>
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>
>
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