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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
Section: Chapter Questions
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images.py 1 "un 2 File: invert.py 3 Project 7.7 4 Defines and tests a function for inverting images. 5 """ 6 7 from images import Image 8 invert.py 9 def invert(image): 10 11 12 def black And White (image): 13 14 15 16 17 18 19 20 21 22 23 24 25 def grayscale (image): 26 27 28 29 30 31 32 33 34 35 36 def main(): 37 46 """Inverts an image to its negative.""" """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: smokey.gif """Converts an image to grayscale.""" for y in range(image.getHeight()): for x in range(image.getWidth()): (r, g, b) = image.getPixel(x, y) r = int(r * 0.299) g= int(g * 0.587) b = int(b* 0.114) lum = r + g + b image.setPixel(x, y, (lum, lum, lum)) 38 39 40 41 42 43 """grayscale (image) 44 invert(image) 45 image.draw()""" filename=input("Enter the image file name: ") image Image (filename) #Invert image invert(image) image.draw() #Covert to greyscale, then invert #Convert to black and white, then invert """blackAndWhite (image) invert(image) image.draw()""" 47 48 49 50 51 if __name__ == "__main__": 52 main() 53 | +
Transcribed Image Text:images.py 1 "un 2 File: invert.py 3 Project 7.7 4 Defines and tests a function for inverting images. 5 """ 6 7 from images import Image 8 invert.py 9 def invert(image): 10 11 12 def black And White (image): 13 14 15 16 17 18 19 20 21 22 23 24 25 def grayscale (image): 26 27 28 29 30 31 32 33 34 35 36 def main(): 37 46 """Inverts an image to its negative.""" """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: smokey.gif """Converts an image to grayscale.""" for y in range(image.getHeight()): for x in range(image.getWidth()): (r, g, b) = image.getPixel(x, y) r = int(r * 0.299) g= int(g * 0.587) b = int(b* 0.114) lum = r + g + b image.setPixel(x, y, (lum, lum, lum)) 38 39 40 41 42 43 """grayscale (image) 44 invert(image) 45 image.draw()""" filename=input("Enter the image file name: ") image Image (filename) #Invert image invert(image) image.draw() #Covert to greyscale, then invert #Convert to black and white, then invert """blackAndWhite (image) invert(image) image.draw()""" 47 48 49 50 51 if __name__ == "__main__": 52 main() 53 | +
Instructions 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. An example of the program is shown below: Original Original Image & Inverted Image Grading Inverted When you have completed your program, click the Submit button to record your score.
Transcribed Image Text:Instructions 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. An example of the program is shown below: Original Original Image & Inverted Image Grading Inverted When you have completed your program, click the Submit button to record your score.
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