Hi, Thanks to Thomas, the problem has been solved by removing an OFFSITE parameter configuring the layer (http://mapserver.org/en/mapfile/layer.html).
With the following layer configuration: PROCESSING "RESAMPLE=AVERAGE" PROCESSING "OVERSAMPLE_RATIO=16" the visual quality of the produced image is very good (for the PNG and JPEG format). Best regards, Cédric On Mon, Dec 17, 2012 at 5:11 PM, Cédric MOULLET <[email protected]>wrote: > No, we tried with 80 and it doesn't change anything. > > > > On Mon, Dec 17, 2012 at 5:00 PM, thomas bonfort > <[email protected]>wrote: > >> >> >> >> On Mon, Dec 17, 2012 at 4:49 PM, Cédric MOULLET <[email protected] >> > 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 < >>> [email protected]> 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 < >>>> [email protected]> 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 < >>>>> [email protected]> 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 >>>>> [email protected] >>>>> 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 >>> >>> >> > > > -- > 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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