Benoit Andrieu wrote:
Thanks for the answer Frank !
So in a first time I'll be looking at making a gdaladdo bis.
By the way, do you know why Mapserver does "only" support nearest, average,
bilinear, bicubic ?
I thought it was using GDAL to do warping, but then it would natively support
cubics
i
> À: "gdal-dev@lists.osgeo.org >> Gdal-Dev"
> Date: 31/03/2009 00:06
> Objet: Re: [gdal-dev] Availability of Lanczos and cubicspline in gdaladdo
>
> Seth Price wrote:
> > I actually hope to be addressing performance in my GSoC project. I'm
> > intere
hots.
Or try to reproduce on differents datasets.
Regards,
Benoît Andrieu
> -Message reçu-
> De: Frank Warmerdam
> À: Benoit Andrieu
> Cc: "gdal-dev@lists.osgeo.org"
> Date: 30/03/2009 23:48
> Objet: Re: [gdal-dev] Availability of Lanczos and cubicspline in gd
Seth Price wrote:
I actually hope to be addressing performance in my GSoC project. I'm
interested in rewriting the GDAL resampling code to CUDA, so the graphics
card does the hard work. For example, instead of processing one pixel at a
time, the latest GeForce GTX 260 would be able to process 216
Benoit Andrieu wrote:
The quality after downsizing images with gdalwarp is so perfect that I
am now willing to include this in my overviews.
Is there any chances to have this include in future releases or is there
any difficulties I am not aware of ?
It is my intention to add a cubic resampling
e: Seth Price
> À: Benoit Andrieu
> Cc: gdal-dev@lists.osgeo.org
> Date: 30/03/2009 22:55
> Objet: Re: [gdal-dev] Availability of Lanczos and cubicspline in gdaladdo
>
> I actually hope to be addressing performance in my GSoC project. I'm
> interested in rewriting the GDAL resa
One reason that warping is different than overviews is that warping has
much more versatile resampling. For the current overview code, an integer
number of pixels are combined into one pixel, and there is no overlap
between resampling areas. For warping code, each destination pixel draws
from sourc
formance is a really big problem with Lanczos/cubicspline...
>
> I'll take a look at the code.
>
> Regards,
>
> Benoît Andrieu
> b...@ixsea.com
> benoit.andr...@gmail.com
>
>> -Message reçu-
>> De: "Seth Price"
>> Ã: Benoît An
Thanks for the answer,
> > Hi list !
> >
> > I was wondering why the Lanczos and cubicspline are available in
> > gdal_warp and not gdaladdo ?
>
> Benoît,
>
> The overview builder and warper use quite different mechanisms so there
> is no close relationship between the resampling options avail
The resampling code between gdal_warp and gdaladdo is completely separate,
thus it is basically two different projects. For the Google Summer of Code
application I'm about to submit I will be working on the resampling code
in GDAL's warper and GRASS. If I have time (and my application is
accepted!)
Benoît Andrieu wrote:
Hi list !
I was wondering why the Lanczos and cubicspline are available in
gdal_warp and not gdaladdo ?
Benoît,
The overview builder and warper use quite different mechanisms so there
is no close relationship between the resampling options available in each
case.
The q
Hi list !
I was wondering why the Lanczos and cubicspline are available in gdal_warp and
not gdaladdo ?
The quality after downsizing images with gdalwarp is so perfect that I am now
willing to include this in my overviews.
Is there any chances to have this include in future releases or is ther
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