[daip] Re: AIPS: lwpla

[Amy Mioduszewski]

Hi Shane,

O.K., first you are making the rotation measure a grayscale, so there 
isn't really a background in this case, i.e., each pixel is assigned a 
color in the grayscale.  If you just had contours then you would have a 
background color that you could change with PLCOLORS.  The reason you 
got a white "background" when you used a grayscale is that is the color 
it assigned those pixels because there is no flux there.  The color 
pallet you are using (OFMFILE) assigns black to that level.  So there 
isn't really a bug in LWPLA.  You could write your own OFMFILE (see 
EXPLAIN OFMFILE) and that might solve your problem, but you are going to 
have to experiment a bit.

EXAMPLE:
I took a copy of RAINBOW.001 (in $AIPSOFM) and changed the first line from:
0 :     0     0     0
to:
0 : 10000 10000 10000
this assigned white to level "0" rather than black.

Cheers,

Amy