Make color transparent but only in a specific area

opheropher Posts: 1
Hi,

Im new to Global Mapper and using v16.
I have a large map (one file ECW format of 8gb) but it has a lot of black.
I want to remove the black parts to be transparent but when I try to remove the black it also removes the black parts of the map (name of cities etc).
Is there a quick and easy way to remove the black areas?

thanks!
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