def reduce_width(pic, reducing_factor):
''' Take Picture pic and return a duplicate of it that is horizontally
compressed by an Integer reducing_factor'''
# Create a new Picture with the appropriate old height and new width, and
# initialize the colour to black (all colour components are zero).
new_width = (pic.get_width() - 1) / reducing_factor + 1
new_height = pic.get_height()
newpic = media.create_picture(new_width, new_height, media.black)
# Iterate through all the Pixels in the large image, and copy
# a portion of that Pixel's colour components into the correct
# Pixel position in the smaller image.
for pixel in pic:
# Find the corresponding Pixel in the new Picture.
x_coordinate = media.get_x(pixel)/reducing_factor;
y_coordinate = media.get_y(pixel);
newpixel = media.get_pixel(newpic, x_coordinate, y_coordinate)
# Add the appropriate fraction of this Pixel's colour components
# to the components of the corresponding Pixel in the new Picture.
new_red = newpixel.get_red() + pixel.get_red()/reducing_factor
new_blue = newpixel.get_blue() + pixel.get_blue()/reducing_factor
new_green = newpixel.get_green() + pixel.get_green()/reducing_factor
media.set_red(newpixel, int(new_red))
media.set_blue(newpixel, int(new_blue))
media.set_green(newpixel, int(new_green))
return newpic
def test_pixel_set_get_RGB(self):
"""Test setting and getting the red, green, and blue of a pixel."""
pic = media.create_picture(WIDTH, HEIGHT)
p = media.get_pixel(pic, WIDTH - 1, HEIGHT - 1)
media.set_red(p, 1)
self.assert_(media.get_red(p) == 1)
media.set_green(p, 2)
self.assert_(media.get_green(p) == 2)
media.set_blue(p, 3)
self.assert_(media.get_blue(p) == 3)
def test_pixel_set_get_RGB(self):
"""Test setting and getting the red, green, and blue of a pixel."""
pic = media.create_picture(WIDTH, HEIGHT)
p = media.get_pixel(pic, WIDTH - 1, HEIGHT - 1)
media.set_red(p, 1)
self.assert_(media.get_red(p) == 1)
media.set_green(p, 2)
self.assert_(media.get_green(p) == 2)
media.set_blue(p, 3)
self.assert_(media.get_blue(p) == 3)
def scale_green(pic, new_green_average):
''' Take the Picture pic and set the average value of all green pixels in
the picture to the Integer new_green_average. Return scaled picture
Assume that the picture will have some colour component in it'''
old_average = float(green_average(pic))
for pixel in pic:
new_green = (new_green_average * media.get_green(pixel)) / old_average
if new_green > 255:
new_green = 255
media.set_green(pixel, int(new_green))
return pic
def reduce_width(pic, factor):
'''Create a new picture newpic that has a reduced width of pic by a
factor of factor.'''
new_height = pic.get_height()
new_width = (pic.get_width() + factor - 1) / factor
newpic = media.create_picture(new_width, new_height, media.black)
for pixel in pic:
x = media.get_x(pixel)
y = media.get_y(pixel)
newpixel = media.get_pixel(newpic, x/factor, y)
new_red = newpixel.get_red() + pixel.get_red()/factor
new_blue = newpixel.get_blue() + pixel.get_blue()/factor
new_green = newpixel.get_green() + pixel.get_green()/factor
media.set_red(newpixel, new_red)
media.set_blue(newpixel, new_blue)
media.set_green(newpixel, new_green)
return newpic
def expand_width(pic, expand_factor):
'''Create a new picture new_pic that has an expanded width of pic by a
factor of expand_factor.'''
height = media.get_height(pic)
width = expand_factor * media.get_width(pic)
new_pic = media.create_picture(width, height, media.black)
for pixel in new_pic:
x = media.get_x(pixel)
y = media.get_y(pixel)
new_pixel = media.get_pixel(pic, x / expand_factor, y )
new_red = new_pixel.get_red() + pixel.get_red()
new_blue = new_pixel.get_blue() + pixel.get_blue()
new_green = new_pixel.get_green() + pixel.get_green()
media.set_red(pixel, new_red)
media.set_blue(pixel, new_blue)
media.set_green(pixel, new_green)
return new_pic
def scale_green(pic, new_green):
'''Set the average green of a Picture pic to a new average new_green'''
average_green = green_average(pic)
pixel_ratio = float(new_green) / average_green
for pixel in pic:
green = media.get_green(pixel)
target_green = pixel_ratio * green
if target_green > 255.0:
target_green = 255
change_green = media.set_green(pixel, int(target_green))
# -*- coding: utf-8 -*-
import media
pic = media.load_picture(media.choose_file())
media.show(pic)
for p in media.get_pixels(pic):
new_green = int(0.5 * media.get_green(p))
media.set_green(p, new_green)
media.show(pic)
if __name__ == '__main__':
nose.runmodule()
import media
pic = media.load_picture('pic207.jpg')
media.show(pic)
for p in media.get_pixels(pic):
new_blue = int(0.7 * media.get_blue(p))
new_green = int(0.7 * media.get_green(p))
media.set_blue(p, new_blue)
media.set_green(p, new_green)
media.show(pic)
def to_celsius(t):
return (t - 32.0) * 5.0 / 9.0
def above_freezing(t):
return t > 0
import media
f = media.choose_file()
pic = media.load_picture(f)
for p in media.get_pixels(pic):
media.set_green(p,media.get_green(p)/2)
meida.show(pic)
import media
f = media.choose_file()
pic = media.load_picture(f)
for p in media.get_pixels(pic):
r = media.get_red(p)
g = media.get_green(p)
b = media.get_blue(p)
gray = (g + b + r ) / 3
media.set_green(gray)
media.set_blue(gray)
media.set_red(gray)
import media
if __name__ == '__main__':
filename = media.choose_file()
pic = media.load_picture(filename)
media.show(pic)
# Reduce the blue and green by 30% each to make
# the red stand out.
for pixel in pic:
value = media.get_blue(pixel)
new_blue = int(value * 0.7)
media.set_blue(pixel, new_blue)
value = media.get_green(pixel)
new_green = int(value * 0.7)
media.set_green(pixel, new_green)
media.show(pic)
