ZScaleInterval

class astropy.visualization.ZScaleInterval(nsamples=1000, contrast=0.25, max_reject=0.5, min_npixels=5, krej=2.5, max_iterations=5)

Bases: astropy.visualization.BaseInterval

Interval based on IRAF’s zscale.

http://iraf.net/forum/viewtopic.php?showtopic=134139

Parameters:

image : array_like

Input array.

nsamples : int, optional

Number of points in array to sample for determining scaling factors. Default to 1000.

contrast : float, optional

Scaling factor (between 0 and 1) for determining min and max. Larger values increase the difference between min and max values used for display. Default to 0.25.

max_reject : float, optional

If more than max_reject * npixels pixels are rejected, then the returned values are the min and max of the data. Default to 0.5.

min_npixels : int, optional

If less than min_npixels pixels are rejected, then the returned values are the min and max of the data. Default to 5.

krej : float, optional

Number of sigma used for the rejection. Default to 2.5.

max_iterations : int, optional

Maximum number of iterations for the rejection. Default to 5.

Methods Summary

get_limits(values)

Methods Documentation

get_limits(values)