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Inverting an image makes it look like a photographic negative. Define a function named invert. This function expects an image as an argument and resets each RGB component to 255 minus that component. Be sure to test the function with images that have been converted to grayscale and black and white as well as color images.

Inverting an image makes it look like a photographic negative. Define a function named invert. This function expects an image as an argument and resets each RGB component to 255 minus that component. Be sure to test the function with images that have been converted to grayscale and black and white as well as color images.

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
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Inverting an image makes it look like a photographic negative.

Define a function named invert. This function expects an image as an argument and resets each RGB component to 255 minus that component. Be sure to test the function with images that have been converted to grayscale and black and white as well as color images.

 

 

1 "" 2 File: invert.py 3 Project 7.7 4 Defines and tests a function for inverting images. 5 """ 7 from images import Image 8 9 def invert(image): 10 """Inverts an image to its negative."** 11 12 def blackAndWhite (image): 13 14 15 16 17 18 19 20 21 22 23 24 25 def grayscale(image): 26 27 28 29 30 31 32 "Converts an image to black and white.""" blackPixel = (0, 0, 0) || || || whitePixel (255, 255, 255) for y in range(image.getHeight()): - for x in range (image.getWidth()): (r, g, b) = image.getPixel(x, y) average (r + g + b) // 3 if average < 128: = image.setPixel(x, y, blackPixel) image.setPixel(x, y, whitePixel) else: """Converts an image to grayscale.' for y in range(image.getHeight()): for x in range (image.getWidth()): (r, g, b) = image.getPixel(x, y) I = int(r* 0.299) = g int(g* 0.587) b int(b* 0.114) || || ||
Transcribed Image Text:1 "" 2 File: invert.py 3 Project 7.7 4 Defines and tests a function for inverting images. 5 """ 7 from images import Image 8 9 def invert(image): 10 """Inverts an image to its negative."** 11 12 def blackAndWhite (image): 13 14 15 16 17 18 19 20 21 22 23 24 25 def grayscale(image): 26 27 28 29 30 31 32 "Converts an image to black and white.""" blackPixel = (0, 0, 0) || || || whitePixel (255, 255, 255) for y in range(image.getHeight()): - for x in range (image.getWidth()): (r, g, b) = image.getPixel(x, y) average (r + g + b) // 3 if average < 128: = image.setPixel(x, y, blackPixel) image.setPixel(x, y, whitePixel) else: """Converts an image to grayscale.' for y in range(image.getHeight()): for x in range (image.getWidth()): (r, g, b) = image.getPixel(x, y) I = int(r* 0.299) = g int(g* 0.587) b int(b* 0.114) || || ||
33 34 35 36 def main(): 37 38 39 40 44 42 43 44 41 45 46 47 48 49 50 51 if 52 53 filename input("Enter the image file name: ") image Image (filename) #Invert image invert(image) image.draw() = lum = r + g + b image.setPixel(x, y, (lum, lum, lum)) #Covert to greyscale, then invert 'grayscale(image) || || || invert(image) image.draw()""" #Convert to black and white, then invert """blackAndWhite (image) invert(image) image.draw()""" __name__ main() "__main__":
Transcribed Image Text:33 34 35 36 def main(): 37 38 39 40 44 42 43 44 41 45 46 47 48 49 50 51 if 52 53 filename input("Enter the image file name: ") image Image (filename) #Invert image invert(image) image.draw() = lum = r + g + b image.setPixel(x, y, (lum, lum, lum)) #Covert to greyscale, then invert 'grayscale(image) || || || invert(image) image.draw()""" #Convert to black and white, then invert """blackAndWhite (image) invert(image) image.draw()""" __name__ main() "__main__":
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