iraf.net

NUMBER:	484
MODULE: mscimage, geotran, rotate, imlintran, [g/s/w]register, imtranspose,
	im3dtran
SYSTEM:	V2.11
DATE:	Fri Jun  1 11:39:39 MST 2001
FROM:	valdes

BUG:    When writing an output FITS image extension, for example,

	    cl> imtranspose abc out.fits[ext2,append]

	the following type of error may occur

	    Attempt to write out of bounds on file (.fits_NNNN)

	where NNNN is some four digit number.  This occurs when the input
	data is operated upon in subblocks where the line dimension is
	smaller than the output dimension.  Therefore, the workaround is to
	set the line buffer block size (e.g. nxblock or len_blk) to
	be the size of the largest image dimension.  Alternatively one
	can create a single image intermediate file and then append that
	to the output with IMCOPY.

	THIS ONLY APPLIES TO CREATING AN OUTPUT EXTENSION AND DOES NOT
	APPLY TO SIMPLE SINGLE FITS OUTPUT IMAGES.  The most common case
	where output extensions are used is when running the mosaic task
	MSCIMAGE which calls GEOTRAN internally.  The workaround for that
	task is to set 'nxblock' to a value larger than the largest input
	extension dimension.

STATUS: This problem is under investigation.