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fix(napari): cycle glasbey colours via CyclicLabelColormap #42

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Merged
lguerard merged 1 commit into from
Jun 25, 2026
Merged

fix(napari): cycle glasbey colours via CyclicLabelColormap #42

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23 changes: 19 additions & 4 deletions src/patchworks/plugins/napari.py
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Original file line number Diff line number Diff line change
Expand Up @@ -260,11 +260,26 @@ def view_in_napari(
if glasbey:
try:
import glasbey as _glasbey

# bias lighter so colours read on napari's dark canvas
label_kwargs["colormap"] = _glasbey.create_palette(
256, lightness_bounds=(40, 100)
import numpy as np
from napari.utils.colormaps import CyclicLabelColormap

# glasbey palette (biased lighter so colours read on the dark
# canvas), wrapped in a CyclicLabelColormap so each label value
# cycles through a distinct colour. Passing the raw palette list
# makes napari map large label IDs past the end -> one flat colour.
palette = _glasbey.create_palette(256, lightness_bounds=(40, 100))
colors = np.array(
[
[
int(h[1:3], 16) / 255,
int(h[3:5], 16) / 255,
int(h[5:7], 16) / 255,
1.0,
]
for h in palette
]
)
label_kwargs["colormap"] = CyclicLabelColormap(colors=colors)
except ImportError:
logger.warning(
"glasbey not installed; using napari's default label colours "
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