A mapping for an asinh stretch, estimating the linear stretch by zscale
x = asinh(Q (I - z1)/(z2 - z1))/Q
Parameters
----------
image
The image to analyse, or a list of 3 images to be converted to an intensity image
Q : `int`
The asinh softening parameter
pedestal : `float` or sequence of `float`, optional
The value, or array of 3 values, to subtract from the images
N.b. pedestal, if not None, is removed from the images when calculating the zscale
stretch, and added back into Mapping.minimum[]
See also
--------
AsinhMapping
Definition at line 324 of file _rgbContinued.py.