SNToner.py | Sepia&Negative Effect in Images

#! /usr/bin/env python
# SNToner.py
# Author: Abdul Fatir
# E-Mail: abdulfatirs@gmail.com

from PIL import Image
# Opening the Raw Image File
raw_image = Image.open("raw.png")
WIDTH,HEIGHT = raw_image.size
# Creating Image objects for Sepia and Negative Images
sepia_image = Image.new("RGB",(WIDTH,HEIGHT))
neg_image = Image.new("RGB",(WIDTH,HEIGHT))
# Loading Pixel Data for all images
raw_pixels = raw_image.load()
sepia_pixels = sepia_image.load()
neg_pixels = neg_image.load()

for Y in range(HEIGHT):
    for X in range(WIDTH):
        # Getting RGB of each pixel
        R,G,B = raw_pixels[X,Y]
        oR = (R*.393) + (G*.769) + (B*.189)
        oG = (R*.349) + (G*.686) + (B*.168)
        oB = (R*.272) + (G*.534) + (B*.131)
        # Writing pixel data after doing necessary manipulations
        sepia_pixels[X,Y] = (int(oR),int(oG),int(oB))
        neg_pixels[X,Y] = (255-R,255-G,255-B)
# Saving the images
sepia_image.save('sepia.png')
neg_image.save('negative.png')