Interpolate image

[thomas bonfort]

yes, AGG only renders vector formats, raster processing hasn't changed.

have you had a look at http://mapserver.gis.umn.edu/development/rfc/ms-rfc-4/

PROCESSING "RESAMPLE=NEAREST"
PROCESSING "RESAMPLE=AVERAGE"
PROCESSING "RESAMPLE=BILINEAR"
PROCESSING "RESAMPLE=BICUBIC"

tb

On 9/18/07, Guillaume Sueur <guillaume.sueur at neogeo-online.net> wrote:
> 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
>
>
>
>