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Demonstrates how to use the minimum blending mode with inverted colormaps. minimum blending uses the minimum value of each R, G, B channel for each pixel. minimum blending can be used to yield multichannel color images on a white background, when the channels have inverted colormaps assigned. An inverted colormap is one where white [1, 1, 1] is used to represent the lowest values, as opposed to the more conventional black [0, 0, 0]. For example, try the colormaps prefixed with I, such as I Forest or I Bordeaux, from ChrisLUTs: https://github.com/cleterrier/ChrisLUTs .
from skimage import data import napari # create a viewer viewer = napari.Viewer() # Add the cells3d example image, using the two inverted colormaps # and minimum blending mode. Note that the bottom-most layer # must be translucent or opaque to prevent blending with the canvas. viewer.add_image(data.cells3d(), name=["membrane", "nuclei"], channel_axis=1, contrast_limits = [[1110, 23855], [1600, 50000]], colormap = ["I Purple", "I Orange"], blending= ["translucent_no_depth", "minimum"] ) if __name__ == '__main__': napari.run()