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Denis Lehmann 2020-05-08 21:03:02 +02:00
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huepaper.py Executable file
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#!/usr/bin/env python
import argparse
import os.path
import random
import sys
from PIL import Image, ImageDraw, ImageOps
from colour import Color
# Create base image from four colors, width and height
# c1 - top left
# c2 - top right
# c3 - bottom right
# c4 - bottom left
def create_base_image(c1, c2, c3, c4):
# Lambda for adding four colors
add = lambda c1, c2, c3, c4 : (c1[0] + c2[0] + c3[0] + c4[0], c1[1] + c2[1] + c3[1] + c4[1], c1[2] + c2[2] + c3[2] + c4[2])
# Lambda for multiplying a color with a factor
mul = lambda c, x : (c[0] * x, c[1] * x, c[2] * x)
# Lambda for scaling a color from [0 , 1] to [0, 255]
cor = lambda c : (int(c[0] * 255), int(c[1] * 255), int(c[2] * 255))
# Lambda for calculating a color at x and y in range [0, 1]
# Color limits are set at creation
col = lambda x, y, c1 = c1, c2 = c2, c3 = c3, c4 = c4 : cor(add(mul(c1, (1.0 - x) * (1.0 - y)), mul(c2, x * (1.0 - y)), mul(c3, x * y), mul(c4, (1.0 - x) * y)))
# Create image
imgage = Image.new('RGBA', (width, height))
pixels = imgage.load()
for x in range(0, width):
for y in range(0, height):
pixels[x, y] = col(x / (width - 1), y / (height - 1))
return imgage
# Get base color
def get_base_color(color_string = None):
# If no color string is given, create a random color
if not color_string:
hue = random.uniform(0, 1)
sat = random.uniform(sat_min, sat_max)
lum = random.uniform(lum_min, lum_max)
base_color = Color(hue = hue, saturation = sat, luminance = lum)
print('Selected random base color: {}'.format(base_color.hex))
# Else try to parse string
else:
try:
base_color = Color(color_string)
except:
print('Not a valid color expression: {}'.format(color_string))
sys.exit(1)
return base_color
# Create colors from a base color
def create_colors(base_color):
colors = []
max_sat_diff = 0.1
max_lum_diff = 0.1
# Create four random colors similar to the given base_color
for i in range(0, 4):
tmp_hue = base_color.hue + random.uniform(-max_hue, max_hue)
if tmp_hue > 1.0:
tmp_hue -= 1
tmp_sat = base_color.saturation + random.uniform(-max_sat_diff, max_sat_diff)
tmp_sat = min(sat_max, max(sat_min, tmp_sat))
tmp_lum = base_color.luminance + random.uniform(-max_lum_diff, max_lum_diff)
tmp_lum = min(lum_max, max(lum_min, tmp_lum))
color = Color(hue = tmp_hue, saturation = tmp_sat, luminance = tmp_lum)
colors.append(color.rgb)
return tuple(colors)
# Add emblem to an image from a filepath
def add_emblem(image, filepath):
# Load image
try:
emblem_image = Image.open(filepath)
except Exception as e:
print('Failed to load emblem: {}'.format(e))
sys.exit(1)
# Exit if emblem is too big
if emblem_image.size[0] > width or emblem_image.size[1] > height:
print('Emblem can\'t be bigger than the wallpaper')
sys.exit(1)
# Insert emblem in the center
offset = ((image.size[0] - emblem_image.size[0]) // 2, (image.size[1] - emblem_image.size[1]) // 2)
image.alpha_composite(emblem_image, offset)
return image
# Add lines to an image
def add_lines(image, color):
line_image = Image.new('RGBA', (width, height), (0, 0, 0, 0))
draw = ImageDraw.Draw(line_image)
# Set color
color = tuple(map(lambda x : int(x * 255), color))
# Generate lines
number_of_lines = random.randint(1, 3)
scale = width / 100.0
base_width = random.randint(int(2 * scale), int(5 * scale))
rand_width = lambda base_width = base_width : base_width + random.randint(-base_width // 2, base_width // 2)
space = rand_width() // 2
offset = random.randint(0, space)
for i in range(0, number_of_lines):
line_width = rand_width()
x = offset + space + (line_width // 2)
draw.line((x, 0, x, height), fill = color, width = line_width)
offset += space + line_width
# Mirror line image eventually
orientation = random.randrange(2)
if orientation == 1:
line_image = ImageOps.mirror(line_image)
# Add line image to input image
image.alpha_composite(line_image, (0, 0))
return image
# Add pixelation to image
def add_pixelation(image, x, y):
image = image.resize((x, y))
image = image.resize((width, height), Image.BOX)
return image
# Save image to filepath
def save_image(filepath, image):
save = True
# Check whether file exists
if os.path.isfile(filepath):
overwrite = input('The file {} already exists. Do you want to overwrite it? [y/N] '.format(filepath))
if overwrite != 'y' and overwrite != 'Y':
save = False
if save:
try:
image.save(filepath)
except Exception as e:
print('Failed to save wallpaper: {}'.format(e))
'''
Main
'''
def main():
global width, height, max_hue, sat_min, sat_max, lum_min, lum_max
# Initialize parser
parser = argparse.ArgumentParser(description = 'Create wallpapers based on color hues.')
parser.add_argument('-W', '--width', default = 1920, type = int, help = 'width of wallpaper (defaul: 1920)')
parser.add_argument('-H', '--height', default = 1080, type = int, help = 'height of wallpaper (default: 1080)')
parser.add_argument('-c', '--color', help = 'color, the wallpaper is generated from (uses a random color if not given)')
parser.add_argument('-p', '--preview', action = 'store_true', help = 'preview wallpaper')
parser.add_argument('-o', '--output', help = 'file where to save the wallpaper to (default: None)')
parser.add_argument('-l', '--lines', nargs = '?', const = 0.1, type = float, help = 'include one to three random lines in base color with given opacity in range [0, 1] (default: 0.1)')
parser.add_argument('-lb', '--lines_bright', nargs = '?', const = 0.1, type = float, help = 'include one to three bright random lines with given opacity in range [0, 1] (default: 0.1)')
parser.add_argument('-ld', '--lines_dark', nargs = '?', const = 0.1, type = float, help = 'include one to three dark random lines with given opacity in range [0, 1] (default: 0.1)')
parser.add_argument('-e', '--emblem', help = 'emblem to add in the center of the wallpaper')
parser.add_argument('-P', '--pixelate', help = "pixelate image (e.g. 42x42)")
parser.add_argument('-hue', default = 0.1, type = float, help = 'maximum hue to differ from given color in range [0, 1] (default: 0.1)')
parser.add_argument('-smin', default = 0.2, type = float, help = 'minimum satisfaction for colors in range [0, 1] (default: 0.2)')
parser.add_argument('-smax', default = 1.0, type = float, help = 'maximum satisfaction for colors in range [0, 1] (default: 1.0)')
parser.add_argument('-lmin', default = 0.2, type = float, help = 'minimum luminance for colors in range [0, 1] (default: 0.2)')
parser.add_argument('-lmax', default = 0.9, type = float, help = 'maximum luminance for colors in range [0, 1] (default: 0.9)')
# Get args
args = parser.parse_args()
width = args.width
height = args.height
color = args.color
preview = args.preview
output = args.output
lines = args.lines
lines_bright = args.lines_bright
lines_dark = args.lines_dark
emblem = args.emblem
pixelate = args.pixelate
max_hue = args.hue
sat_min = args.smin
sat_max = args.smax
lum_min = args.lmin
lum_max = args.lmax
# Check preconditions
if not preview and not output:
parser.error('You must either set -p (--preview) or -o (--output)')
if pixelate:
try:
values = pixelate.split('x')
px = int(values[0])
py = int(values[1])
except:
parser.error('Pixelation value must be set in form: 42x42')
# Main routine
base_color = get_base_color(color)
c1, c2, c3, c4 = create_colors(base_color)
image = create_base_image(c1, c2, c3, c4)
if lines:
image = add_lines(image, base_color.rgb + (lines,))
if lines_bright:
image = add_lines(image, (1.0, 1.0, 1.0, lines_bright))
if lines_dark:
image = add_lines(image, (0.0, 0.0, 0.0, lines_dark))
if emblem:
image = add_emblem(image, emblem)
if pixelate:
image = add_pixelation(image, px, py)
if preview:
image.show()
if not output:
save = input('Do you want to save the image? [y/N] ')
if save == 'y' or save == 'Y':
path = input('Enter the path where the wallpaper shall be saved: ')
save_image(path, image)
if output:
save_image(output, image)
if __name__ == '__main__':
main()