iraf.net

NUMBER:	177
MODULE:	images.imcombine, ccdred.combine, onedspec.scombine
SYSTEM:	V2.10-V2.10.1
DATE:	Wed Aug 12 10:30:19 MST 1992
FROM:	valdes

BUG:	The minmax rejection option when used with a final average and with
	weights does not correct for the rejected pixels in the weights
	normalization.  For example with four images having identical
	weights and rejecting the high and low the final output is the sum
	of the middle pixels divided by 4 instead of 2.  There is no
	workaround.  If the weights are equal the end result is just that
	the mean intensity levels are low by a constant factor.  However,
	when the weights are not equal the final result will have pixel
	position dependent effects.

STATUS:	Fixed for V2.10.2