[AstroPy] zscale in astropy.visualization

[ES.Enrique Perez]

There is img_scale.py that implements zscale:

# Written by Min-Su Shin
# Department of Astronomy, University of Michigan (2009 - )
# Department of Astrophysical Sciences, Princeton University (2005 - 2009)
#
# You can freely use the code.
#
# http://www.astrobetter.com/making-rgb-images-from-fits-files-with-pythonmatplotlib/
#


> El 12/4/2016, a las 15:11, Thomas Robitaille <thomas.robitaille at gmail.com> escribió:
> 
> Hi John,
> 
> As far as I know there is no implementation of zscale in
> astropy.visualization, but it would be great to have one! I've opened
> an issue here:
> 
> https://github.com/astropy/astropy/issues/4773
> 
> If anyone is interested in implementing this, just comment on the issue!
> 
> Cheers,
> Tom
> 
> 
> On 11 April 2016 at 19:06, John K. Parejko <parejkoj at uw.edu> wrote:
>> Is there something akin to the ds9-style zscaling algorithm in astropy.visualization (or elsewhere in astropy)? I don't see anything named as such, but maybe it is called differently?
>> 
>> This is the algorithm described in this iraf.net email from Frank Valdes:
>> 
>> http://iraf.net/forum/viewtopic.php?showtopic=134139
>> 
>> Thanks,
>> John
>> 
>> --
>> *************************
>> John Parejko
>> parejkoj at uw.edu
>> http://staff.washington.edu/parejkoj/
>> Department of Physics and Astronomy
>> University of Washington
>> Seattle, WA
>> **************************
>> 
>> 
>> 
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>> 
>> 
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