==================
Backwards Incompatible Changes
------------------------------
- The following helper functions in `sunkit_image.coalignment` have been removed, with no replacement.
This is because they are designed to be internal helper functions.
If you need to use them in your own code create a copy of the functions from the ``sunkit-image`` source code.
- ``parabolic_turning_point``
- ``calculate_clipping``
- ``check_for_nonfinite_entries``
- ``get_correlation_shifts``
- ``clip_edges``
- ``find_best_match_location``
- ``calculate_shift`` (`100 <https://github.com/sunpy/sunkit-image/pull/100>`__)
- The following helper functions in `sunkit_image.radial` have been removed, with no replacement.
This is because they are designed to be internal helper functions.
If you need to use them in your own code create a copy of the functions from the ``sunkit-image`` source code.
- ``fit_polynomial_to_log_radial_intensity``
- ``calculate_fit_radial_intensity``
- ``normalize_fit_radial_intensity``
- Made the following functions in `sunkit_image.trace` private:
1. ``curvature_radius`` (renamed to ``_curvature_radius``)
2. ``erase_loop_in_image`` (renamed to ``_erase_loop_in_image``)
3. ``initial_direction_finding`` (renamed to ``_initial_direction_finding``)
4. ``loop_add`` (renamed to ``_loop_add``)
These were never intended to be used by users but for the user-facing functions. (`136 <https://github.com/sunpy/sunkit-image/pull/136>`__)
- Dropped support for Python 3.8 by increasing minimum required Python version to 3.9.
Dropped support for sunpy 4.0 and 4.1 by increasing minimum required sunpy version to 5.0.
Dropped support for scikit-image 0.18 by increasing minimum required scikit-image version to 0.19. (`155 <https://github.com/sunpy/sunkit-image/pull/155>`__)
Features
--------
- Add two examples demonstrating the usage of ``~sunkit_image.coalignment.mapsequence_coalign_by_match_template`` and ``~sunkit_image.coalignment.mapsequence_coalign_by_rotation``. (`90 <https://github.com/sunpy/sunkit-image/pull/90>`__)
- Added the `sunkit_image.granule` module which provides functions to segment granulation in images of the solar photosphere.
The key functionality is contained in the `~sunkit_image.granule.segment` function, which
segments an image into intergranule, granule, faculae, and, optionally, dim granule. (`114 <https://github.com/sunpy/sunkit-image/pull/114>`__)
- ``mypy`` type checking has been enabled on the repository.
Types have not yet been extensively added, but running ``mypy`` does not raise any errors. (`133 <https://github.com/sunpy/sunkit-image/pull/133>`__)
- Several functions have been updated to accept either numpy array or sunpy map inputs.
The following functions now accept either a numpy array or sunpy map, and return the same data type:
- `sunkit_image.enhance.mgn`
- `sunkit_image.trace.bandpass_filter`
- `sunkit_image.trace.smooth`
The following functions now accept either a numpy array or sunpy map, and their return type is unchanged:
- `sunkit_image.trace.occult2` (`135 <https://github.com/sunpy/sunkit-image/pull/135>`__)
- Modifications to the `sunkit_image.granule` module.
1. Increase in speed for large images achieved by computing the initial thresholding on a random subset of pixels.
2. Increase accuracy on images with spatially varying background flux levels achieved by applying a local histogram equalization before computing the initial thresholding.
3. Prevention of errors in finding "dim centers" in images that have all-granule edges achieved by adding a "padding" of zero pixels around the edges.
4. Correction of the assignment of the values 2 and 3 to brightpoints and dim centers. (`154 <https://github.com/sunpy/sunkit-image/pull/154>`__)
Improved Documentation
----------------------
- Added two notes to `sunkit_image.enhance.mgn` detailing prerequisites for using this function. (`126 <https://github.com/sunpy/sunkit-image/pull/126>`__)
- Added a tutorial (:ref:`sphx_glr_generated_gallery_rgb_composite.py`) demonstrating how to create an RGB image with three different maps. (`128 <https://github.com/sunpy/sunkit-image/pull/128>`__)