[mapserver-users] JPEG and OVERSAMPLE_RATIO

[Cédric MOULLET]

No, we tried with 80 and it doesn't change anything.


On Mon, Dec 17, 2012 at 5:00 PM, thomas bonfort <thomas.bonfort at gmail.com>wrote:

>
>
>
> 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
>>>>
>>>>
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>>>>
>>>>
>>>
>>
>>
>> --
>> 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
>>
>>
>


-- 
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
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