You can make use of the DATACUBE squash shell script which is a user friendly interface to the KAPPA collapse application allowing you to create both white-light and passband image, e.g.
% squash -p NDF input file: ifu_file Shape: No. of dimensions: 3 Dimension size(s): 59 x 110 x 961 Pixel bounds : 1:59, 1:110, 1:961 Total pixels : 6236890 Wavelength bounds : 4526:10089.8 Lower Wavelength-axis bound : 4526 Upper Wavelength-axis bound : 10089.8 Collapsing: White-light image: 59 x 110 Wavelength range: 4526--10089.8 Angstrom NDF output file: out Output NDF: File: out.sdf %
Figure: The squash script.
Here we make a white-light image from the input data file ifu_file.sdf, saving it as a two-dimensional NDF file out.sdf as well as plotting it in a GWM window (see the figure).
Alternatively we can make use of scripts command-line options and specify the input and output files, along with the wavelength bounds, on the command line, as in this example.
% squash -i ifu_file -o out -l 4526 -u 10089.8 -p
Alternatively we can make direct use of the collapse application.
% collapse IN - Input NDF /@/tmp/aa_squash_collapse/ > ifu_file AXIS - The axis to be collapsed /'1'/ > 3 Collapsing pixel axis 3 from pixel 1 to pixel 961 inclusive... OUT - Output NDF > out %
Here we collapse the cube along the third () axis.
The IFU Data-Product Cookbook