[daip] question

[Eric Greisen]

Farhad Zadeh wrote:
> Hi Eric,
> Hope all is well.
> 
> I am trying to make a background subtracted GBT map
> and I was wondering if there is a way I could make a noise map in aips and
> then subtract it from the image.
> I can look at the region away from the Galactic  plane and get the 
> background noise but don't know how to make a background image of the 
> same size and subtract it from the real  image in aips?. Any suggestions?
> I appreciate.
> Cheers,
> Farhad
> 
> 

Are you just trying to subtract a constant?  The RESCALE verb will do 
that.  Otherwise you need in some way to make a real image of the real 
background.  That image may be rescaled and resampled with tasks like 
OHGEO or HGEOM.  PATGN is a way to make an arbitrary image but this does 
not sound all that arbitrary...

Eric Greisen