[R-sig-Geo] Problem with ignoring background value

Ophelia Wang opheliawang at mail.utexas.edu
Mon May 26 00:03:21 CEST 2008

Hi all,

Thanks for all the responses. I finally fixed the problem by creating a binary
mask that sets the aerial photos as 1 and the white background (layer 1=255,
layer 2=254 and 255, layer 3=255) as 0. I then used the mask function in Erdas'
utilities to mask out the unwanted background.


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