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Buglog #483
- Wednesday, May 16 2001 @ 08:46 PM GMT
- Contributed by: admin
- Views: 1,447
MODULE: immatch.psfmatch
SYSTEM: V2.11
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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