read_matrix (
        self,
        ijk_origin,
        ijk_size,
        ijk_step,
        time=None,
        progress=None,
        )

Reads a submatrix from a potentially very large file. Returns 3D NumPy matrix with zyx index order.

__init__ (
        self,
        priism_data,
        wavelength,
        wave_index,
        min_intensity,
        max_intensity,
        element_type,
        )