iraf.net

NUMBER:	403
MODULE:	fixpix, ccdproc, display
SYSTEM:	V2.11-V2.11.1
DATE:	Fri Jun  5 09:45:47 MST 1998
FROM:	valdes

BUG:	When fixing regions by interpolation along columns/across lines,
	which may be set by the user or automatically by finding the
	narrowest direction across a region of bad pixels, it is possible
	to get a segmentation error or error related to referencing invalid
	memory.  Whether this error occurs depends on the contents
	of memory.  If no error occurs the result is correct.

	One workaround is to use only interpolation across columns/along
	lines if this makes sense.  Another workaround is to add a dummy
	region with interpolation along columns covering all the columns.
	For example the first or last line as in '1 3072 1 1' for an image
	with 3072 columns.  It is also possible to break up the operation
	in FIXPIX using multiple passes.  For example if a bad pixel region
	is described by the rectangle '2000 3024 510 512' then two passes
	using '2000 2500 510 512' and '2500 3024 510 512' may work.

STATUS:	Fixed in the next release.