I want to display an image matrix variable on Google Colab, I have a function to change the BGR image to Grayscale, but if I display it using the function plt.imgshow() from matplotlib the image that comes out is not grayscale. I try to use the "image" function Image in IPython.display but the results don't come out, below is the script that I made
!wget "https://www.duckietown.org/wp-content/uploads/2018/05/duckietown_nice-1024x683.jpg" -O dt.jpg
import sys
import cv2
import numpy as np
from matplotlib import pyplot as plt
from IPython.display import Image
image = cv2.imread('./dt.jpg')
H, W = image.shape[:2]
gray = np.zeros((H, W), np.uint8)
for i in range(H):
for j in range(W):
gray[i, j] = np.clip(0.299 * image[i, j, 0] + 0.587 * image[i, j, 1] + 0.114 * image[i, j, 2], 0, 255)
imgGray = gray
Image(imgGray)
How do I fix this? is there a function that can display images on Google Colab besides the two functions above?
Do this. It'll show image in grayscale.
import sys
import numpy as np
from matplotlib import pyplot as plt
from IPython.display import Image
image = cv2.imread('./dt.jpg')
val = np.subtract(image,128)
plt.imshow(np.abs(val), cmap=plt.get_cmap('gray'),vmin=0,vmax=255)
plt.title('Image'), plt.xticks([]), plt.yticks([])
plt.show()