[daip] aips_gripe

[Eric Greisen]

Lincoln Greenhill writes:
 > {04-JUN-2003 12:24:38}
 > {rglinux2     UN-REGISTERED!!!!!!!}
 > {   24  31DEC03  LINX}
 > { }
 > { }
 > { }
 > {When TASAV is run on an image, it sets the ref pixels to 1.  All other
 >  header parameters look OK.
 >   }
 > {TASAV loses ref pixels when it is run on an image.}
 > { }
 > { }

When TASAV makes a 1-pixel image it must re-adjust the reference pixel
for the selected BLC.  I suppose it could select BLC=1, in which case
the ref pixel would be off the "image" and unchanged.  Instead, it
sets BLC to the ref pixel - so the new ref pixel is (barring fractions
anyway) 1.  The CC file for example keeps all as Delta X from the ref
pixel - so it is only important to retain the coordinate value at the
ref pixel and the increments at the ref pixel.

N.B. SUBIM and all other sub-image selections also change the ref
pixel location.

Eric Greisen