Reducer

------------------

General
^^^^^^^

New Features
^^^^^^^^^^^^

Other Changes
^^^^^^^^^^^^^

Bug fixes
^^^^^^^^^

- Check that the image collection for master images exists before refreshing
it. [128]

------------------

General
^^^^^^^

New Features
^^^^^^^^^^^^

Other Changes
^^^^^^^^^^^^^

Bug fixes
^^^^^^^^^

- The `ImageFileCollection` used to find masters was out of date and not
refreshed if a reduction widget was created before the masters were
created. [127]

------------------

General
^^^^^^^

New Features
^^^^^^^^^^^^

Other Changes
^^^^^^^^^^^^^

- Use combine function for combining images to limit memory usage during
image combination. [120, 121]

- Use ``median`` and ``median_absolute_deviation`` in sigma clipping instead
of the default ``mean`` and ``std``. [106]

- Discard mask/uncertainty from result of image combination unless input
images have mask/uncertainty. [119]

- Choose sensible data type for reduced images based on data type of original
images. [122]

Bug fixes
^^^^^^^^^

- Eliminate huge memory usage by reduction. [118]

------------------

General
^^^^^^^

New Features
^^^^^^^^^^^^

Other Changes
^^^^^^^^^^^^^

- Improve display of images in file browser.

Bug fixes
^^^^^^^^^

- Work around a bug in ccdproc/astropy.nddata that incorrectly creates an
uncertainty as a mask.

- Work around a bug in astropy.io.fits that results in writing incorrect
data values in some cases.

------------------

General
^^^^^^^

New Features
^^^^^^^^^^^^

Other Changes
^^^^^^^^^^^^^

Bug fixes
^^^^^^^^^

- Ensure unsigned int images can be displayed. [115, 116]
- Ensure that combined images can be written. [117]