[Geotiff] How to merge two GeoTiff files?

[YuGo]

Thanks,Ted.
but I don't have Photoshop.

Ted Florence wrote:
> You can do this in Adobe Photoshop with the Geographic Imager plugin.
> 
> Ted Florence
> Avenza Systems Inc. -  Developers of MAPublisher & Geographic Imager 
> Visit  http://www.avenza.com
> MAPublisher - When Map Quality Matters (r)
> 
> 
> On Thu, 7 Dec 2006, YuGo wrote:
> 
>> Hi,
>> I want to merge GeoTiff files.
>> I have many files as tiles.so,I excute this from command line.
>> How I do?
>>
>> this is exaple files.
>> http://www2.gtec-ni.com/geotiff/G684106.tif
>> http://www2.gtec-ni.com/geotiff/G684107.tif
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> 
>