hyperspy.io module

hyperspy.io.assign_signal_subclass(dtype, signal_dimension, signal_type='', lazy=False)

Given record_by and signal_type return the matching Signal subclass.

Parameters

  • dtype (dtype) –

  • signal_dimension (int) –

  • signal_type ({"EELS", "EDS", "EDS_SEM", "EDS_TEM", "DielectricFunction", "", str}) –

  • lazy (bool) –

Returns

Return type

Signal or subclass

hyperspy.io.dict2signal(signal_dict, lazy=False)

Create a signal (or subclass) instance defined by a dictionary

Parameters

signal_dict (dictionary) –

Returns

s

Return type

Signal or subclass

hyperspy.io.load(filenames=None, signal_type=None, stack=False, stack_axis=None, new_axis_name='stack_element', lazy=False, convert_units=False, **kwds)

Load potentially multiple supported file into an hyperspy structure.

Supported formats: hspy (HDF5), msa, Gatan dm3, Ripple (rpl+raw), Bruker bcf and spx, FEI ser and emi, SEMPER unf, EMD, EDAX spd/spc, tif, and a number of image formats.

Any extra keyword is passed to the corresponding reader. For available options see their individual documentation.

Parameters

  • filenames (None, str or list of strings) – The filename to be loaded. If None, a window will open to select a file to load. If a valid filename is passed in that single file is loaded. If multiple file names are passed in a list, a list of objects or a single object containing the data of the individual files stacked are returned. This behaviour is controlled by the stack parameter (see bellow). Multiple files can be loaded by using simple shell-style wildcards, e.g. ‘my_file*.msa’ loads all the files that starts by ‘my_file’ and has the ‘.msa’ extension.

  • signal_type ({None, "EELS", "EDS_SEM", "EDS_TEM", "", str}) – The acronym that identifies the signal type. The value provided may determine the Signal subclass assigned to the data. If None the value is read/guessed from the file. Any other value overrides the value stored in the file if any. For electron energy-loss spectroscopy use “EELS”. For energy dispersive x-rays use “EDS_TEM” if acquired from an electron-transparent sample — as it is usually the case in a transmission electron microscope (TEM) —, “EDS_SEM” if acquired from a non electron-transparent sample — as it is usually the case in a scanning electron microscope (SEM). If “” (empty string) the value is not read from the file and is considered undefined.

  • stack (bool) – If True and multiple filenames are passed in, stacking all the data into a single object is attempted. All files must match in shape. If each file contains multiple (N) signals, N stacks will be created, with the requirement that each file contains the same number of signals.

  • stack_axis ({None, int, str}) – If None, the signals are stacked over a new axis. The data must have the same dimensions. Otherwise the signals are stacked over the axis given by its integer index or its name. The data must have the same shape, except in the dimension corresponding to axis.

  • new_axis_name (string) – The name of the new axis when axis is None. If an axis with this name already exists it automatically append ‘-i’, where i are integers, until it finds a name that is not yet in use.

  • lazy ({None, bool}) – Open the data lazily - i.e. without actually reading the data from the disk until required. Allows opening arbitrary-sized datasets. The default is False.

  • convert_units ({bool}) – If True, convert the units using the convert_to_units method of the axes_manager. If False, does nothing. The default is False.

  • print_info (bool) – For SEMPER unf- and EMD (Berkeley)-files, if True (default is False) additional information read during loading is printed for a quick overview.

  • downsample (int (1–4095)) – For Bruker bcf files, if set to integer (>=2) (default 1) bcf is parsed into down-sampled size array by given integer factor, multiple values from original bcf pixels are summed forming downsampled pixel. This allows to improve signal and conserve the memory with the cost of lower resolution.

  • cutoff_at_kV ({None, int, float}) – For Bruker bcf files, if set to numerical (default is None) bcf is parsed into array with depth cutoff at coresponding given energy. This allows to conserve the memory, with cutting-off unused spectra’s tail, or force enlargement of the spectra size.

  • select_type ({'spectrum_image', 'image', 'single_spectrum', None}) – If None (default), all data are loaded. For Bruker bcf and Velox emd files: if one of ‘spectrum_image’, ‘image’ or ‘single_spectrum’, the loader return single_spectrumns either only the spectrum image or only the images (including EDS map for Velox emd files) or only the single spectra (for Velox emd files).

  • first_frame (int (default 0)) – Only for Velox emd files: load only the data acquired after the specified fname.

  • last_frame (None or int (default None)) – Only for Velox emd files: load only the data acquired up to specified fname. If None, load up the data to the end.

  • sum_frames (bool (default is True)) – Only for Velox emd files: if False, load each EDS frame individually.

  • sum_EDS_detectors (bool (default is True)) – Only for Velox emd files: if True, the signal from the different detector are summed. If False, a distinct signal is returned for each EDS detectors.

  • rebin_energy (int, a multiple of the length of the energy dimension (default 1)) – Only for Velox emd files: rebin the energy axis by the integer provided during loading in order to save memory space.

  • SI_dtype (numpy.dtype) – Only for Velox emd files: set the dtype of the spectrum image data in order to save memory space. If None, the default dtype from the Velox emd file is used.

  • load_SI_image_stack (bool (default False)) – Only for Velox emd files: if True, load the stack of STEM images acquired simultaneously as the EDS spectrum image.

  • dataset_name (string or list, optional) – For filetypes which support several datasets in the same file, this will only load the specified dataset. Several datasets can be loaded by using a list of strings. Only for EMD (NCEM) files.

  • only_valid_data (bool, optional) – Only for FEI emi/ser file in case of series or linescan with the acquisition stopped before the end: if True, load only the acquired data. If False, fill empty data with zeros. Default is False and this default value will change to True in version 2.0.

Returns

Return type

Signal instance or list of signal instances

Examples

Loading a single file providing the signal type:

>>> d = hs.load('file.dm3', signal_type="EDS_TEM")

Loading multiple files:

>>> d = hs.load('file1.dm3','file2.dm3')

Loading multiple files matching the pattern:

>>> d = hs.load('file*.dm3')

Loading (potentially larger than the available memory) files lazily and stacking:

>>> s = hs.load('file*.blo', lazy=True, stack=True)
hyperspy.io.load_single_file(filename, **kwds)

Load any supported file into an HyperSpy structure Supported formats: netCDF, msa, Gatan dm3, Ripple (rpl+raw), Bruker bcf, FEI ser and emi, EDAX spc and spd, hspy (HDF5), and SEMPER unf.

Parameters

filename (string) – File name (including the extension)

hyperspy.io.load_with_reader(filename, reader, signal_type=None, convert_units=False, **kwds)
hyperspy.io.save(filename, signal, overwrite=None, **kwds)