How to detect two different colors using `cv2.inRange` in Python-OpenCV?

Question

How can I define \"lower\" and \"upper\" range of two different color, such as red and blue (because red and blue are not next to each other in the HSV color)

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Answer 1

# Make a copy of the image

image_copy = np.copy(image)
## TODO: Define the color selection boundaries in RGB values
# play around with these values until you isolate the blue background

lower_blue = np.array([200,0,0]) 
upper_blue = np.array([250,250,255])

# Define the masked area

mask = cv2.inRange(image_copy, lower_blue, upper_blue)
# Vizualize the mask

plt.imshow(mask,cmap='gray')