[gdal-dev] gradient alpha transparency bands for edge-blending in gdal_merge

Jeffrey Warren jeff at unterbahn.com
Sun Jan 1 23:55:27 EST 2012

I'm using some images with blurred edges (like http://tinyurl.com/6r2s3z4)
to mosaic a larger geotiff with gdal_merge, but it doesn't respect
transparency that's not either 0 or 1. Is there any way to achieve this
without coding my own merge tool?

This is what results: http://tinyurl.com/7xckw98

The command i'm using (gdal 1.7.3 on ubuntu 11.10) is:

gdal_merge.py -n 0 -o warren-township-geo.tif 47539-geo.tif 47543-geo.tif

More detail on this issue is here:

I'd appreciate any tips, and I am wondering if I can contribute if this
functionality does not exist already.

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