Table of Contents
ccdsub - sub/average of an image, and optionally reorder axes.
ccdsub takes a subimage from an image, as
described by a new set of coordinates in X, Y and/or Z (since the expression
of the selected axes is arbitrary, the resulting coordinate system may
Since cubes/images produced by this program may have dummy axes
(length 1), you will need to use ccdslice(1NEMO)
to get rid of them, or
use the dummy= keyword below.
If no parameters are given, other than in=
and out=, the image is copied straight through, which is still a great
way to test your I/O subsystem, assuming your image fits in memory.
following parameters are recognized in any order if the keyword is also
To reorder a cube from xyz to zxy and back to xyz, the 2nd step
will have a perhaps non-intuitive axis reordering, since it refers to the
new "zxy" order:
- Input image file
- Output image file
- X coordinates
to select. Valid numbers are 1..nx. By default all will be selected. See also
- Y coordinates to select. Valid numbers are 1..ny. By default
all will be selected.
- Z coordinates to select. Valid numbers are 1..nz. By
default all will be selected.
- Number X to aver (size remains same)
- Number Y to aver (size remains same)
- Number Y to aver
(size remains same)
- Up to three values (between 0 and 1) to
take that fraction of that axis for subsetting the cube. Using this option
will override the corresponding x=, y= and/or z=. Any axis not specified
will inherit the corresponding x=, y= or z=. Default: not used.
- Write out dummy axes as well? [true]
- New order of axes after
all previous actions have been taken. The default is no reordering, i.e. keep
it in xyz order. To reverse only the X and Y axis, reorder=yxz is needed.
ccdsub cube0 - reorder=zxy | ccdsub - cube1 reorder=yzx
1993 code written PJT
22-Feb-97 man page written PJT
12-aug-02 more doc PJT
17-jun-03 WCS for simple subsetting PJT
9-apr-09 V1.6 replace skip= with dummy=, fix bug nzaver= PJT
18-jun-09 V2.0a fixed bug when Z size if different from XY PJT
24-dec-2020 V2.4 add centerbox= PJT
Table of Contents