Last modified: December 2020

URL: https://cxc.cfa.harvard.edu/sherpa/ahelp/unpack_image.html
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AHELP for CIAO 4.13 Sherpa v1

unpack_image

Context: data

Synopsis

Create an image data structure.

Syntax

unpack_image(arg, coord='logical', dstype=DataIMG)

coord - { 'logical', 'image', 'physical', 'world', 'wcs' }, optional
dstype - optional

Examples

Example 1

>>> img1 = unpack_img("img.fits")
>>> set_data(img1)

Example 2

>>> img = unpack_img('img.fits', 'physical')

Example 3

Read in an image using Crates:

>>> cr = pycrates.read_file('broad.img')
>>> idata = unpack_img(cr)

Example 4

Read in an image using AstroPy:

>>> hdus = astropy.io.fits.open('broad.img')
>>> idata = unpack_img(hdus)

PARAMETERS

The parameters for this function are:

Parameter Definition
arg Identify the data: a file name, or a data structure representing the data to use, as used by the I/O backend in use by Sherpa: an imagecrate for crates, as used by CIAO, or a list of AstroPy HDU objects.
coord Ensure that the image contains the given coordinate system.
dstype The image class to use. The default is `DataIMG` .

Return value

The return value from this function is:

The class of the returned object is controlled by the dstype parameter.


Bugs

See the bugs pages on the Sherpa website for an up-to-date listing of known bugs.

See Also

data
dataspace1d, dataspace2d, datastack, fake, load_arf, load_arrays, load_ascii, load_bkg, load_bkg_arf, load_bkg_rmf, load_data, load_grouping, load_image, load_multi_arfs, load_multi_rmfs, load_pha, load_quality, load_rmf, load_staterror, load_syserror, load_table, pack_image, pack_pha, pack_table, unpack_arf, unpack_arrays, unpack_ascii, unpack_bkg, unpack_data, unpack_pha, unpack_rmf, unpack_table
filtering
load_filter
info
get_default_id, list_bkg_ids, list_data_ids
modeling
add_model, add_user_pars, image_model, image_model_component, image_source, image_source_component, load_table_model, load_template_interpolator, load_template_model, load_user_model, save_model, save_source
psfs
image_kernel
saving
save_arrays, save_data, save_delchi, save_error, save_filter, save_grouping, save_image, save_pha, save_quality, save_resid, save_staterror, save_syserror, save_table
statistics
load_user_stat
visualization
contour, contour_data, contour_model, contour_ratio, contour_resid, image_close, image_data, image_deleteframes, image_fit, image_getregion, image_open, image_ratio, image_resid, image_setregion, image_xpaget, image_xpaset