Interpolate image

[Guillaume Sueur]

I think AGG optimization only applies on vector data. Am I wrong ?

Guillaume

Pål Kristensen a écrit :
> Hi!
> 
> I have recently installed ms4w 2.2.6 beta which include MS 5.0 RC2. The
> reason for this was to test the new AGG rendering engine when using
> Mapserver as a WMS server, with only high resolution (RGB) rasters as the
> data source. Most WMS servers around (both free and commercial) uses nearest
> neighbor interpolation on the resulting image that is transfered to the
> client. In situations where the source data is only hires rasters or imagery
> (as in my case), the quality of the output would be much better if you could
> apply an bilinear interpolation to the produced image (see the attached
> images for an example). Because in most cases the pixels in the source data
> and the pixels on the screen do not match up, even if I have produces
> pyramids on the source data (using gdal gdaladdo with the average option
> sett). The only WMS servers that has the ability to interpolate the
> resulting image with bilinear interpolation (that I have discovered) is the
> ESRI ArcIMS ArcMap image service and the ESRI ArcGIS Server.
> 
> I kind of hoped that the new AGG rendering back-end would give an option to
> set the interpolation method used in the output, but I see no difference
> when using AGG instead of GD. (IMAGEMODE is 24bit (RGB) PNG in both cases).
> Am I missing something here, or do not AGG increase the image quality if the
> resulting image if the data source is only rasters? Does anyone have any
> experience concerning this issue, and maybe could give me some advice?
> 
> ArcGIS Server
> http://www.nabble.com/file/p12754990/ArcGIS_Server.png 
> 
> 
> Mapserver 5.0 rc2 with AGG rendering
> http://www.nabble.com/file/p12754990/MapServer_5rc2_AGG.png 
> 
> Regards,
> Pål Kristensen
> Norwegian Mapping and Cadastre Authority


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