[Python] Error when converting image to array and back to image in python, image is erased

When I run this code, from original image (blue ring attached), at first show I see circle but after if I convert to RGB and do any manipulation(I tried selecting different columns, etc.), I always get a straight line (hopefully attached here too). Eventually I would like to be able to manipulate RGB channels, but for now just display every color channel as same matrix as original blue channel.

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Code is:

from PIL import Image
import matplotlib.pyplot as plt;
import numpy as np
import cv2 as cv

img = Image.open(r"/Users/gadlicht/Downloads/test.jpg") # creating image object
img1 = img.convert("RGB") # using convert method for img1
img1.show()


def magColBlue(x,blurAmount):
x=np.array(x)
print("x first shape is ", np.shape(x))
x=x[:,:,0]
print("x 2nd shape is ", np.shape(x))
print(x)
return x



blueAmount =magColBlue(img1,0)
print("blue shape",np.shape(blueAmount))
imgBlue = Image.fromarray(np.asarray([blueAmount,blueAmount,blueAmount]), 'RGB')
imgBlue.show()

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