[mapserver-users] JPEG and OVERSAMPLE_RATIO

[thomas bonfort]

Can you post the outputformats defined in your mapfile, and the urls used
to access each of these images?

--
thomas


On Mon, Dec 17, 2012 at 4:18 PM, Cédric MOULLET <cedric.moullet at gmail.com>wrote:

> I realize that links have been sent and not pictures
> Here are reachable links for the three cases:
> 1.
> https://picasaweb.google.com/lh/photo/j_OClw5fGOeQE7K1wiimytMTjNZETYmyPJy0liipFm0?feat=directlink
> 2.
> https://picasaweb.google.com/lh/photo/3q52h52EwOp9JzZm3KAWbNMTjNZETYmyPJy0liipFm0?feat=directlink
> 3.
> https://picasaweb.google.com/lh/photo/GTAThw7AOVMK-j-7DWAabtMTjNZETYmyPJy0liipFm0?feat=directlink
> Cédric
>
>
> On Mon, Dec 17, 2012 at 4:11 PM, Cédric MOULLET <cedric.moullet at gmail.com>wrote:
>
>> Hi,
>> The following issue has been observed with MapServer 6.0.3:
>>
>> 1. Very good quality for a PNG with RESAMPLE=BILINEAR and
>> OVERSAMPLE_RATIO=16:
>> [image:
>> http://wms-bgdi.bgdi.admin.ch/?lang=xx&LAYERS=ch.swisstopo.pixelkarte-grau-pk100_bazl&FORMAT=image%2Fpng&SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&STYLES=&SRS=EPSG%3A21781&BBOX=513184,143152,519840,149808&WIDTH=256&HEIGHT=256]
>>
>> 2. Less good quality for a PNG or JPEG with default resampling settings:
>> [image:
>> http://wms-bgdi.bgdi.admin.ch/?lang=xx&LAYERS=ch.swisstopo.pixelkarte-grau-pk100_original&FORMAT=image%2Fpng&SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&STYLES=&SRS=EPSG%3A21781&BBOX=513184,143152,519840,149808&WIDTH=256&HEIGHT=256]
>>
>> 3. Awful quality for JPEG with RESAMPLE=BILINEAR and OVERSAMPLE_RATIO=16:
>> [image:
>> http://wms-bgdi.bgdi.admin.ch/?lang=xx&LAYERS=ch.swisstopo.pixelkarte-grau-pk100_bazl&FORMAT=image%2Fjpeg&SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&STYLES=&SRS=EPSG%3A21781&BBOX=513184,143152,519840,149808&WIDTH=256&HEIGHT=256]
>>
>> Any idea why the OVERSAMPLE_RATIO affects heavily the quality of JPEG
>> images ?
>>
>> Thanks in advance for your help,
>> Cédric
>>
>
>
>
> --
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> Home sweet home:
> http://map.geo.admin.ch/?crosshair=bowl&zoom=11&X=185241.24219&Y=561288.90625&bgOpacity=0&selectedNode=node_ch.swisstopo.fixpunkte-lage1
>
>
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