[gdal-dev] .ovr files and Lanczos
robbkwright at gmail.com
Tue Nov 29 01:30:29 EST 2011
Thanks Chaitanya. Unfortunately gdaladdo doesn't support the Lanczos
resampling type. Lanczos creates - by far - the best looking
downsampled images for my type of rasters. What I'm looking for is a
way to create pyramid layers/.ovr files using the Lanczos resampling method.
On 11/29/2011 12:58 AM, Chaitanya kumar CH wrote:
> If you are using gdal version 1.6 or later, you can use the -ro
> option. It opens the tiff file in read-only mode and creates
> external overview.
> : http://www.gdal.org/gdaladdo.html
> On Mon, Nov 28, 2011 at 11:53 PM, Robb Wright <robbkwright at gmail.com
> <mailto:robbkwright at gmail.com>> wrote:
> I'm working with indexed color types of raster data (charts). The
> data is in RGB geotiffs and I'm using gdaladdo to create pyramid
> layers for them. Unfortunately, the best method for this raster
> type available using gdaladdo is still pretty bad - much of the
> linework becomes garbled when viewing the pyramids. The
> best-looking method that I've been able to come up with is:
> gdaladdo.exe --config COMPRESS_OVERVIEW DEFLATE -r average
> The Lanczos algorithm method works beautifully when used with
> other programs - but I need to create .ovr files. gdal_retile.py
> output looks great - but I can't figure out how to create .ovr
> files from that output.
> Does anybody know of the availability of the Lanczos resampling
> method for gdaladdo - or of another way to create .ovr files with
> gdal-dev mailing list
> gdal-dev at lists.osgeo.org <mailto:gdal-dev at lists.osgeo.org>
> Best regards,
> Chaitanya kumar CH.
> 17.2416N 80.1426E
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