[mapserver-users] White lines when reprojecting aerial photo
Hi, we are trying to provide aerial photo images in multiple projections using on-the-fly reprojection in JPEG format. When reprojecting layer from our country's local projection to Google Mercator, thin white lines appearing through the whole image (see http://gista.sk/home/ivo/dl/white_lines.jpeg). We are using 'AGG/JPEG' driver, Mapserver 5.2 with following outputformat configuration: RESOLUTION 72 OUTPUTFORMAT NAME 'AGG_JPEG' DRIVER 'AGG/JPEG' MIMETYPE 'image/jpeg' IMAGEMODE RGB FORMATOPTION 'QUALITY=85' EXTENSION 'jpg' END Any idea what I can improve to get these white lines out ? Thanks, Ivan ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users
[mapserver-users] White lines when reprojecting aerial photo
Dont know if this relates to your problem, but its easy to check. We normally use the GD/JPEG driver when doing image data. My understanding is that AGG is more useful for outputting vectors to PNG. Also, this will slow it down but in the raster layer PROCESSING "RESAMPLE=BICUBIC" rather than default NEAREST is effective especially for hi-rez data. On Sun, Dec 19, 2010 at 1:26 PM, Ivan Mincik wrote: > Hi, > we are trying to provide aerial photo images in multiple projections > using on-the-fly reprojection in JPEG format. When reprojecting layer > from our country's local projection to Google Mercator, thin white > lines appearing through the whole image (see > http://gista.sk/home/ivo/dl/white_lines.jpeg). > > We are using 'AGG/JPEG' driver, Mapserver 5.2 with following > outputformat configuration: > > RESOLUTION 72 > OUTPUTFORMAT > NAME 'AGG_JPEG' > DRIVER 'AGG/JPEG' > MIMETYPE 'image/jpeg' > IMAGEMODE RGB > FORMATOPTION 'QUALITY=85' > EXTENSION 'jpg' > END > > Any idea what I can improve to get these white lines out ? > > Thanks, > Ivan > ___ > mapserver-users mailing list > mapserver-users@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/mapserver-users > ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users
Re: [mapserver-users] White lines when reprojecting aerial photo
> > Also, this will slow it down but in the raster layer > > PROCESSING "RESAMPLE=BICUBIC" rather than default NEAREST is effective > especially for hi-rez data. Thanks a lot Mark, I totally forgot on resampling methods. I have tried BICUBIC which doesn't work, but BILINEAR is working fine. Ivan ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users
