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 maximize_red(pic):
new_pic = media.copy(pic)
for pix in new_pic:
media.set_red(pix, 255)
return new_pic
def maximize_red(pic):
new_pic = media.copy(pic)
for pix in new_pic:
media.set_red(pix, 255)
return new_pic
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_red(pic, new_red_average):
''' Take the Picture pic and set the average value of all red pixels in
the picture to the Integer new_average. Return scaled picture.
Assume that the picture will have some colour component in it'''
old_average = float(red_average(pic))
for pixel in pic:
new_red = (new_red_average / old_average) * media.get_red(pixel)
if new_red > 255:
new_red = 255
media.set_red(pixel, int(new_red))
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_red(pic, new_red):
'''Set the average red of a Picture pic to a new average new_red'''
average_red = red_average(pic)
pixel_ratio = float(new_red)/ average_red
for pixel in pic:
red = media.get_red(pixel)
target_red = pixel_ratio * red
if target_red > 255.0:
target_red = 255
change_red = media.set_red(pixel, int(target_red))
import media
f = media.choose_file()
pic = media.load_picture(f)
for p in media.get_pixels(pic):
media.set_red(p,0)
media.show(pic)
# -*- coding: utf-8 -*-
import media
pic = media.load_picture(media.choose_file())
for p in media.get_pixels(pic):
new_red = int(2 * media.get_red(p))
media.set_red(p, new_red)
media.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
f = media.choose_file()
pic = media.load_picture(f)
for p in media.get_pixels(pic):
r = media.get_red(p)
media.set_red(2*r)
media.show(pic)