phot.radprof.ee_radius

phot.radprof.ee_radius(
    im,
    center,
    fraction=0.5,
    r_min=0.5,
    r_max=None,
    sum_is_unity=False,
)

Find the radius enclosing a fraction of the total image flux.

Parameters

im : 2-D array: PSF or flux image. Total flux must be positive and contain no NaNs.
center : tuple of float: Center position in (x, y) order.
fraction : float = 0.5: The enclosed flux fraction to find the radius for. Default is 0.5.
r_min : float = 0.5: Lower bound for the search radius in pixels. Default is 0.5.
r_max : float = None: Upper bound for the search radius. If None, defaults to half the minimum image dimension. Default is None.
sum_is_unity : bool = False: If True, treat fraction as the target flux and assume im.sum() == 1. If False (default), use fraction * np.sum(im) as the target.