iraf.net

NUMBER:	231
MODULE:	imcombine, ccdred.combine
SYSTEM:	V2.10.2
DATE:	Tue Nov  9 09:17:12 MST 1993
FROM:	valdes

BUG:	If there are fewer pixels at some point than that specified by nkeep
	parameter, such as caused by offsetting, thresholding, or masking,
	then the tasks try to add data from the nonexistent images resulting
	either in garbage or a segmentation violation.  The workaround
	is to use nkeep or 1 or 0 rather a higher value unless there
	are no offsets or other factors that will result in a smaller
	number of points than the number of images at some points.

STATUS:	This has been fixed for V2.10.3.  This also resulted in a change
	in how a negative nkeep is used.  In the new version, if one
	specifies a maximum number to reject, that number applies to
	the initial set of pixels rather than to the total number of
	images.