AsinhZScaleMapping#

class lsst.afw.display.AsinhZScaleMapping(image, Q=8, pedestal=None)#

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

Qint

The asinh softening parameter

pedestalfloat 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[]