Better default TPF stretch

CHANGES.rst

@@ -1,7 +1,7 @@
 0.4.0 (unreleased)
 ------------------
 
-* Support loading, viewing, and slicing through TPF data cubes. [#82]
+* Support loading, viewing, and slicing through TPF data cubes. [#82, #117]
 
 * Default data labels no longer include flux-origin, but do include quarter/campaign/sector. [#111]
 

lcviz/parsers.py

@@ -4,6 +4,7 @@
 import lightkurve
 
 from lcviz.viewers import PhaseScatterView, TimeScatterView
+from lcviz.plugins.plot_options import PlotOptions
 
 __all__ = ["light_curve_parser"]
 
@@ -75,6 +76,11 @@ def light_curve_parser(app, file_obj, data_label=None, show_in_viewer=True, **kw
                                    vid='image', name='image')
                 app.add_data_to_viewer('image', new_data_label)
 
+        # set TPF viewer's stretch to custom defaults:
+        plot_options_plugin = PlotOptions(app=app)
+        if plot_options_plugin is not None:
+            plot_options_plugin._default_tpf_stretch()
+
     else:
         if show_in_viewer:
             for viewer_id, viewer in app._viewer_store.items():

lcviz/plugins/plot_options/plot_options.py

@@ -1,3 +1,5 @@
+import numpy as np
+
 from jdaviz.configs.default.plugins import PlotOptions
 from jdaviz.core.registries import tray_registry
 
@@ -31,6 +33,20 @@ def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
         self.docs_link = f"https://lcviz.readthedocs.io/en/{self.vdocs}/plugins.html#plot-options"
 
+    def _default_tpf_stretch(
+            self, vmin_percentile=5, vmax_percentile=99, tpf_viewer_reference='image'
+    ):
+        viewer = self.app.get_viewer(tpf_viewer_reference)
+        image = viewer.layers[0].get_image_data()
+        vmin, vmax = np.nanpercentile(
+            image, [vmin_percentile, vmax_percentile]
+        )
+
+        self.viewer_selected = tpf_viewer_reference
+        self.stretch_function_value = 'log'
+        self.stretch_vmin_value = vmin
+        self.stretch_vmax_value = vmax
+
     @property
     def user_api(self):
         api = super().user_api