How do I edit .ecw mosaic to remove white unwanted surrounds

WillowWillow Global Mapper UserPosts: 1
edited October 2014 in Raster Data
Hi Forum Members
I am new to Global Mapper and need help with the following please.

I have a Brisbane high res mosaic .ecw file that has been cropped with the white surrounds next to the imagery.
The imagery tiles within the mosaic are an unusual shape, but have been cropped as a larger square.
What is the easiest way to crop the white space away from the file?
I would like to clean the file up so I can convert it to OSM tiles.

Any advice would be fantastic.


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