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

[Jeffrey Warren]

That did work; thanks very much!

closed:
https://github.com/jywarren/mapknitter/issues/15#issuecomment-3344500

On Mon, Jan 2, 2012 at 12:30 AM, Jean-Claude Repetto <jrepetto at free.fr>wrote:

> On 01/02/12 05:55, Jeffrey Warren wrote:
>
>> 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 47547-geo.tif
>>
>> More detail on this issue is here:
>> https://github.com/jywarren/**mapknitter/issues/15#**issuecomment-3326956<https://github.com/jywarren/mapknitter/issues/15#issuecomment-3326956>
>>
>> I'd appreciate any tips, and I am wondering if I can contribute if this
>> functionality does not exist already.
>>
>> Jeff
>>
>
> Hi Jeff,
>
> I am not sure it will solve your problem, but you should try gdalwarp to
> merge your files.
> gdal_merge.py is only an example program to show how to use the Python
> API. The correct tool to merge files is gdalwarp.
>
> Jean-Claude
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