Skip to main content
Help improve PyPI by participating in a 5-minute user interface survey!

A Matplotlib normalize object that replicates DS9 image stretching

Project Description

ds9norm
=======

This file implements a matplotlib Normalize object which mimics the
functionality of image scaling functions in
`ds9 <http://ds9.si.edu/site/Home.html>`__. It provides 5 ways of
configuring image scaling:

- Clipping the low and high intensities at specified percentiles
(``clip_lo``, ``clip_hi``)
- Specifying an intensity transfer function for ramping from black to
white (``stretch``)
- Setting the mid-point of this transfer function (``bias``, akin to
dragging the right mouse button left/right in ds9)
- Setting how sharp the transition from black-white is (``contrast``,
akin to dragging the right mouse button up/down in ds9)

Examples
--------

See the `example
notebook <http://nbviewer.ipython.org/github/glue-viz/ds9norm/blob/master/Examples.ipynb>`__

.. code:: python


data = fits.getdata('M51.fits')
norm = DS9Normalize(bias=0.2)
figure, axs = plt.subplots(ncols=3, nrows=3, squeeze=False, tight_layout=True)

for ax, bias in zip(axs[2], [.2, .5, .8]):
ax.imshow(data, norm=DS9Normalize(bias=bias))
ax.set_title('Bias = %0.1f' % bias)

for ax, contrast in zip(axs[1], [0.5, 1, 2]):
ax.imshow(data, norm=DS9Normalize(contrast=contrast))
ax.set_title('Contrast = %0.1f' % contrast)

for ax, stretch in zip(axs[0], ['linear', 'sqrt', 'arcsinh']):
ax.imshow(data, norm=DS9Normalize(stretch=stretch))
ax.set_title(stretch)

.. figure:: gallery.png
:alt: ds9norm demo

ds9norm demo
Build Status
------------

[|Build Status|\ ]
(https://travis-ci.org/glue-viz/ds9norm?branch=master) [|Coverage
Status|\ ] (https://coveralls.io/r/glue-viz/ds9norm)

.. |Build Status| image:: https://travis-ci.org/glue-viz/ds9norm.png
.. |Coverage Status| image:: https://coveralls.io/repos/glue-viz/ds9norm/badge.png

Release history Release notifications

This version
History Node

0.1

Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Filename, size & hash SHA256 hash help File type Python version Upload date
ds9norm-0.1.tar.gz (4.9 kB) Copy SHA256 hash SHA256 Source None Aug 7, 2014

Supported by

Elastic Elastic Search Pingdom Pingdom Monitoring Google Google BigQuery Sentry Sentry Error logging CloudAMQP CloudAMQP RabbitMQ AWS AWS Cloud computing Fastly Fastly CDN DigiCert DigiCert EV certificate StatusPage StatusPage Status page