02-17-2014
Where are exactly are you stuck?
How far have you gotten so far?
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LEARN ABOUT DEBIAN
regdiff
regdiff(7) SAORD Documentation regdiff(7)
NAME
RegDiff - Differences Between Funtools and IRAF Regions
SYNOPSIS
Describes the differences between Funtools/ds9 regions and the old IRAF/PROS regions.
DESCRIPTION
We have tried to make Funtools regions compatible with their predecessor, IRAF/PROS regions. For simple regions and simple boolean algebra
between regions, there should be no difference between the two implementations. The following is a list of differences and incompatibili-
ties between the two:
o If a pixel is covered by two different regions expressions, Funtools assigns the mask value of the first region that contains that
pixel. That is, successive regions do not overwrite previous regions in the mask, as was the case with the original PROS regions.
This means that one must define overlapping regions in the reverse order in which they were defined in PROS. If region N is fully con-
tained within region M, then N should be defined before M, or else it will be "covered up" by the latter. This change is necessitated
by the use of optimized filter compilation, i.e., Funtools only tests individual regions until a proper match is made.
o The PANDA region has replaced the old PROS syntax in which a PIE accelerator was combined with an ANNULUS accelerator using AND. That
is,
ANNULUS(20,20,0,15,n=4) & PIE(20,20,0,360,n=3)
has been replaced by:
PANDA(20,20,0,360,3,0,15,4)
The PROS syntax was inconsistent with the meaning of the AND operator.
o The meaning of pure numbers (i.e., without format specifiers) in regions has been clarified, as has the syntax for specifying coordi-
nate systems. See the general discussion on Spatial Region Filtering for more information.
SEE ALSO
See funtools(7) for a list of Funtools help pages
version 1.4.2 January 2, 2008 regdiff(7)