I have jp2 satellite imagery with 4 channels that when I try to open in any
graphics app comes up in greyscale.  When I do an identify...  It tells me
the type is greyscale...

When I open this file in Multispec, I can define that channel 1 is red,
channel 2 is green and channel 3 is blue and it works great...  

I've tried to tell imagemagick that it is an rgba:

convert -size 3000x2000 rgba:test.jp2 testout.jpg

but I get an unexpected end-of-file when I do this.  I've tried splitting
out the channels and combining; forcing it to be rgb...

No matter what I do, I get a greyscale image.

Anyone run into this before?  Any pointers?
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