[gdal-dev] image quality with pyramids (with gdal_retile)

[Mohamed Saâd HESSANE]

I never use gdal_retile, but i use gdaladdo. It's perfect and there's no
qualtity degradation.
gdaladdo create one tiff (or other format if you want) overview, containing
different level.
Syntax : gdaladdo -ro filename 2 4 8 16 32
http://www.gdal.org/gdaladdo.html


2011/3/15 Devrim Baris Acar <devrimbaris at gmail.com>

> Hi,
> I am building a pyramid from a 650 MB geotiff file (rgb) , with the
> following command from fwtools 2.4.6 on a win32 box
>
> gdal_retile -levels 5 -pyramidOnly -targetDir pyramid bathymetry.
>
> I loaded these image files to geoserver and see that when I zoomed to the
> higheest  available level, the images are "degraded in quality" in
> comparison to original one.
> Also , I expected that the resulting pyramid size to be bigger than the
> original file size, but it is NOT.
>
> What is the reason for this , any ideas, and solutions?
>
> Best regards,
>
> Devrim Baris Acar
>
>
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