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Buglog #129
- Tuesday, July 10 1990 @ 11:07 PM GMT
- Contributed by: admin
- Views: 1,148
MODULE: onedspec.splot, onedspec.calibrate
SYSTEM: V2.9
SYSTEM: V2.9
NUMBER: 129 MODULE: onedspec.splot, onedspec.calibrate SYSTEM: V2.9 DATE: Tue Jul 10 17:07:46 MST 1990 FROM: valdes BUG: In SPLOT the first pixel is ignored. In CALIBRATE the wavelength scale for extinction correction will be in error by one pixels. STATUS: These two bugs are related because the header parameter NP1, which is the offset to the first valid pixel, should be zero in most cases but a bug fix in Nov. 1989 put in a minimum value of 1. The symptom in SPLOT is to lose the first pixel but the wavelength scale is correctly compensated. In CALIBRATE the wavelength scale is not compensated though the error should be extremely small since the calibrations are interpolations from a smooth curve. There is no easy work around for SPLOT. If the one pixel wavelength error in CALIBRATE is a concern one could reset the wavelength zero point parameter W0 or CRVAL1 to be greater by WPC or CDELT1; i.e. make the starting wavelength parameter refer to pixel 2. Note that this will make the wavelengths wrong for SPLOT and other ONEDSPEC tasks. This bug is corrected in V2.10. NUMBER: 198 MODULE: images.imcombine SYSTEM: V2.10.2 DATE: Wed Jan 20 16:30:10 MST 1993 FROM: valdes BUG: The CCDCLIP and CRREJECT algorithms quietly fail to reject any pixels. The basic source code is actually correct but due to a dependency condition based on file dates the wrong derived code wes used resulting in a mismatched argument list. This mismatch generally results in the rejection algorithm seeing that there are zero images to process and so no rejection is done. The workarounds are to use a different rejection option or the CCDRED.COMBINE version which is the same except for the ccdtype, keyword mapping, and filter subset features. STATUS: Fixed in V2.10.3. NUMBER: 408 MODULE: ccdred.ccdmask SYSTEM: V2.10-V2.11.1 DATE: Fri Aug 14 10:11:44 MST 1998 FROM: valdes BUG: Single bad pixels are not found. There is no workaround. The code fix is simple. In file noao$imred/ccdred/src/t_ccdmask.x change line 198 from: if (data[i,j] < low && data[i,j] > high) { to: if (data[i,j] < low || data[i,j] > high) { Contact iraf@noao.edu for instructions on how to update an IRAF package, in this case CCDRED. STATUS: Fixed for next release.
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