Addtion, Substration and Multiplication of values to pixels in each channel seperately

Add_Sub_Mul_values to pixels in each channel seperately

from PIL import Image
import matplotlib.pyplot as plt
   
class pixel_transformation:
    
    def __init__(self):
        self.red_added=0
        self.green_added=0
        self.blue_added=0
        self.red_sub=0
        self.green_sub=0
        self.blue_sub=0
        self.red_factor=1
        self.green_factor=1
        self.blue_factor=1

    def pixel_add(self,img,x=0,y=0,z=0):
        self.img=img
        self.red_added=x
        self.green_added=y
        self.blue_added=z

        red, green, blue = self.img.split()

        for y in range(self.img.height):
            for x in range(self.img.width):
                value = self.img.getpixel((x, y))
                # print(value[0])
                new_color = (value[0] + int(red_added), value[1] + int(green_added), value[2] + int(blue_added))
                img.putpixel((x, y), new_color)

        return img

    def pixel_sub(self,img,x=0,y=0,z=0):
        self.img=img
        self.red_sub=x
        self.green_sub=y
        self.blue_sub=z

        red, green, blue = self.img.split()

        for y in range(self.img.height):
            for x in range(self.img.width):
                value = self.img.getpixel((x, y))
                # print(value[0])
                new_color = (value[0] - int(red_sub), value[1] - int(green_sub), value[2] - int(blue_sub))
                img.putpixel((x, y), new_color)

        return img

    def pixel_mul(self,img,x=1,y=1,z=1):
        self.img=img
        self.red_factor=x
        self.green_factor=y
        self.blue_factor=z

        red, green, blue = self.img.split()

        for y in range(self.img.height):
            for x in range(self.img.width):
                value = self.img.getpixel((x, y))
                # print(value[0])
                new_color = (value[0]*red_factor), (value[1]*green_factor), (value[2]*blue_factor)
                img.putpixel((x, y), new_color)

        return img

px=pixel_transformation()

file_path = "/home/quest/cat.jpg"

red_added = int(input("Red to be added: "))
green_added = int(input("Green to be added: "))
blue_added = int(input("Blue to be added: "))

red_sub = int(input("Red to be substrated: "))
green_sub = int(input("Green to be substracted: "))
blue_sub = int(input("Blue to be substracted: "))

red_factor = int(input("Red Factor to be multiplied: "))
green_factor = int(input("Green Factor to be multiplied: "))
blue_factor = int(input("Blue Factorto be multiplied: "))

img = Image.open(file_path)
img=px.pixel_add(img,red_added,green_added,blue_added)
img.save('pixel_add.png')
plt.imshow(img)
plt.show() 

img = Image.open(file_path)
img=px.pixel_sub(img,red_sub,green_sub,blue_sub)
img.save('pixel_sub.png')
plt.imshow(img)
plt.show() 

img = Image.open(file_path)
img=px.pixel_mul(img,red_factor,green_factor,blue_factor)
img.save('pixel_mul.png')
plt.imshow(img)
plt.show()