[mapserver-users] JPEG and OVERSAMPLE_RATIO

[thomas bonfort]

On Mon, Dec 17, 2012 at 4:49 PM, Cédric MOULLET <cedric.moullet at gmail.com>wrote:

> Hi,
> Output formats:
>
> OUTPUTFORMAT
>   NAME "png"
>   MIMETYPE "image/png"
>   DRIVER "AGG/PNG"
>   EXTENSION "png"
>   IMAGEMODE "RGBA"
>   TRANSPARENT TRUE
>   FORMATOPTION "INTERLACE=OFF"
> END
>
> OUTPUTFORMAT
>   NAME jpeg
>   DRIVER "AGG/JPEG"
>   MIMETYPE "image/jpeg"
>   IMAGEMODE RGB
>


>   FORMATOPTION QUALITY=100
>
does changing this to values between 80 and 99 change something ?


>   EXTENSION "jpg"
> END
>
> URL's:
>
>
> 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
>
> Thanks in advance for your help !
> Cédric
>
>
>
> On Mon, Dec 17, 2012 at 4:24 PM, thomas bonfort <thomas.bonfort at gmail.com>wrote:
>
>> 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
>>>>
>>>
>>>
>>>
>>> --
>>> Political blog: http://cedricmoullet.blogspot.com/
>>> Welcome to my world: http://www.cedricmoullet.com/
>>> My Linked In profile: http://www.linkedin.com/in/cedricmoullet
>>> Twitter: http://twitter.com/cedricmoullet
>>> 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
>>>
>>>
>>> _______________________________________________
>>> mapserver-users mailing list
>>> mapserver-users at lists.osgeo.org
>>> http://lists.osgeo.org/mailman/listinfo/mapserver-users
>>>
>>>
>>
>
>
> --
> Political blog: http://cedricmoullet.blogspot.com/
> Welcome to my world: http://www.cedricmoullet.com/
> My Linked In profile: http://www.linkedin.com/in/cedricmoullet
> Twitter: http://twitter.com/cedricmoullet
> 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
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/mapserver-users/attachments/20121217/ee5b7d59/attachment.htm>