AsinhStretch¶
-
class
astropy.visualization.
AsinhStretch
(a=0.1)[source]¶ Bases:
astropy.visualization.BaseStretch
An asinh stretch.
The stretch is given by:
\[y = \frac{{\rm asinh}(x / a)}{{\rm asinh}(1 / a)}.\]- Parameters
a : float, optional
The
a
parameter used in the above formula. The value of this parameter is where the asinh curve transitions from linear to logarithmic behavior, expressed as a fraction of the normalized image. Must be in the range between 0 and 1. Default is 0.1
Attributes Summary
A stretch object that performs the inverse operation.
Methods Summary
__call__
(values[, clip, out])Transform values using this stretch.
Attributes Documentation
-
inverse
¶ A stretch object that performs the inverse operation.
Methods Documentation
-
__call__
(values, clip=True, out=None)[source]¶ Transform values using this stretch.
- Parameters
values : array_like
The input values, which should already be normalized to the [0:1] range.
clip : bool, optional
If
True
(default), values outside the [0:1] range are clipped to the [0:1] range.out :
ndarray
, optionalIf specified, the output values will be placed in this array (typically used for in-place calculations).
- Returns
result :
ndarray
The transformed values.