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Buglog #483

  • Wednesday, May 16 2001 @ 08:46 PM GMT
  • Contributed by:
  • Views: 1,447
MODULE: immatch.psfmatch
SYSTEM: V2.11
NUMBER:	483
MODULE:	immatch.psfmatch
SYSTEM:	V2.11
DATE:	Wed May 16 14:46:37 MST 2001
FROM:	davis

BUG:	There is a symmetry problem in the convolution step if the psf
	matching kernel does not have 180 degree rotational symmetry, due
	to the fact that convolution kernel is not being flipped properly 
	before doing the convolution. The workaround is to create the
	psf matching kernel, rotate it 180 degrees, and then apply it
	with psfmatch or use the psfmatching kernel directly with 
	fconvolve.

	A floating point error may occur in the replace algorithm in
	rare cases due to the input to the log function not being checked
	for 0.0 values. The only workaround is to try the filter options
	'none' or 'model'.


STATUS:	Fixed for the next release of iraf. A fixed version of psfmatch
	is available in the external addon package immatchx.

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