iraf.net

last week I was reducing ctio 2dfruti data on Orion, and I kept
encountering a "segmentation error" while doing "transforms" on
a series of images. The transformation worked fine for the
first 6, failed on the 7th (with this error message), worked on the
8th, failed on the 9th, worked on the 10th and 11th, failed on the
12th, etc. Upon examining the images (which were "reals") I found
that the failure was occuring on a secton of the image where all
of the values were constant -0.3 in value. Adding "1" using imarith
to these images cured the problem and transform worked fine then.
I was using a spline3 interpolation.