Pass colormaps

Add named or unnamed vispy colormaps to existing layers.

Tags: visualization-basic

Python (.py)

Notebook (.ipynb)

/home/runner/work/docs/docs/.venv/lib/python3.12/site-packages/napari/_qt/qt_event_loop.py:50: UserWarning: System theme detection requires a Qt6 backend. Please switch to PyQt6 or PySide6 to use it.
  theme_type=get_system_theme(),
/home/runner/work/docs/docs/.venv/lib/python3.12/site-packages/napari/_qt/qt_event_loop.py:50: UserWarning: System theme detection requires a Qt6 backend. Please switch to PyQt6 or PySide6 to use it.
  theme_type=get_system_theme(),

import numpy as np
from skimage import data

import napari

histo = data.astronaut() / 255
rch, gch, bch = np.transpose(histo, (2, 0, 1))

viewer = napari.Viewer()

rlayer = viewer.add_image(
    rch, name='red channel', colormap='red', blending='additive'
)
glayer = viewer.add_image(
    gch, name='green channel', colormap='green', blending='additive'
)
blayer = viewer.add_image(
    bch, name='blue channel', colormap='blue', blending='additive'
)

if __name__ == '__main__':
    napari.run()