Hey guys.
I have some NAIP imagery in MrSID format. It displays, but the black
area where counties meet is really ugly. The MrSIDs are 3 one-byte
bands: R/G/B The bands do not specify a NODATA but I figure that 0/0/0
(all black) may be usable as a NODATA value, via a PROCESSING directive.
It works nicely, suppressing the black halos and making the
almost-seamless effect where the counties intersect. BUT... it only does
so if I don't show all 3 bands. If I specify any combination of BAND
directives, I get a greyscale image (of course) and the NODATA works
(black halos are gone, so counties are near seamless).
PROCESSING "NODATA=0"
PROCESSING "BANDS="1,2"
#PROCESSING "BANDS="3"
#PROCESSING "BANDS="1,3"
But, if I do not specify the BAND or if I specify all 3 bands, I get the
black halos as if the NODATA were not specified. What gives? Is there
something special I must do to have the NODATA take effect for 3 or more
bands?
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