Why am getting the error?

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Python

ERROR- if r < (75,0,0) and g < (0,75,0) and b < (0,0,255) and b > (0,0,128) : ValueError: operands could not be broadcast together with shapes (558,800) (3,)

import cv2
import numpy as np
from PIL import Image

#image=Image.open('flower.png')
image=cv2.imread("flower.png")
arr=np.array(image)
#arr[:,:]=[,,0]
print(arr[10,10,:])
print(arr.shape)
print(arr.dtype)
print(arr.size)
print(arr.ndim)
print(arr)
r =image[:,:,0]
g =image[:,:,1]
b =image[:,:,2]
print(r,g,b)

'''Rmask= np.all(image==b,axis=-1)
image[Rmask]=[255,255,255]'''

if r  < (75,0,0) and g  < (0,75,0) and b < (0,0,255) and b > (0,0,128) :
       r=(255, 255, 255) 
       g=(255, 255, 255)
       b=(255, 255, 255)

image.show()

# assign blue channel to zeros
#arr[:,:,2] = np.zeros([arr.shape[0], arr.shape[1]])


#img=Image.fromarray(arr)
#img.save('flowerr.png')
#img.show()

What I have tried:

How to solve this ?
ERROR- if r < (75,0,0) and g < (0,75,0) and b < (0,0,255) and b > (0,0,128) : ValueError: operands could not be broadcast together with shapes (558,800) (3,)