<html><head><meta name="color-scheme" content="light dark"></head><body><pre style="word-wrap: break-word; white-space: pre-wrap;"># Using a 2D mask on a 2D color image

from skimage import data
cat = data.chelsea()
reddish = cat[:, :, 0] &gt; 160
cat[reddish] = [0, 255, 0]
plt.imshow(cat)
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