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spectral extraction: improved logic for initial position of "Manual" background trace #1738

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merged 2 commits into from
Oct 19, 2022
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spectral extraction: improved logic for initial position of "Manual" background trace #1738

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d0bc2e4
improved logic for initial position of "Manual" background trace
kecnry Oct 14, 2022
76b4e4b
tweak logic so manual is always in same position as "OneSided"
kecnry Oct 14, 2022
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3 changes: 3 additions & 0 deletions CHANGES.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -24,6 +24,9 @@ Specviz
Specviz2d
^^^^^^^^^

- Improved logic for initial guess for position of "Manual" background trace in spectral extraction
plugin. [#1738]

API Changes
-----------

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8 changes: 5 additions & 3 deletions jdaviz/configs/specviz2d/plugins/spectral_extraction/spectral_extraction.py
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Expand Up @@ -318,17 +318,19 @@ def _trace_dataset_selected(self, msg=None):
default_bg_width = int(np.ceil(width / 10))
default_width = min(default_bg_width, distance_from_edge * 2)

# sign for one-sided and single trace-pixel depending on whether the brightest pixel is
# above or below the middle of the image
sign = 1 if (brightest_pixel < width / 2) else -1

if self.trace_pixel == 0:
self.trace_pixel = brightest_pixel
if self.trace_window == 0:
self.trace_window = default_width
if self.bg_trace_pixel == 0:
self.bg_trace_pixel = brightest_pixel
self.bg_trace_pixel = brightest_pixel + sign * default_bg_width * 2
if self.bg_separation == 0:
if default_bg_width * 2 >= distance_from_edge:
self.bg_type_selected = 'OneSided'
# we want positive separation if brightest_pixel near bottom
sign = 1 if (brightest_pixel < width / 2) else -1
self.bg_separation = sign * default_bg_width * 2
else:
self.bg_separation = default_bg_width * 2
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