Create a Colorful Random Pixel Art on a Black Canvas with Python

Today we will create a simple exercise: randomly fill sparse colorful pixels on a black background.

1. Main Process

Create a 512 × 512 canvas with an opaque black background, then randomly select pixels with a certain probability and assign each a color chosen from seven preset colors (red, orange, yellow, green, cyan, blue, purple).

2. Install required Python library

First install Python and add the python and pip commands to the environment path.

pip install pillow

3. Create RGBA image canvas

from PIL import Image
width = 512
height = 512
# Image size 512x512
img = Image.new('RGBA', (width, height), (0, 0, 0, 255))

4. Randomly color 3% of the pixels

# Set selection probability to 0.03 (3%)
percent = 0.03
# Iterate over all pixels
for i in range(512):
    for j in range(512):
        # random.random() returns a uniform value between 0 and 1
        if random.random() <= percent:
            # Choose a random color from the predefined list
            rgba = random.choice(colors)
            # Set pixel color
            img.putpixel((j, i), rgba)

5. Save the image

img.save('c.png', 'PNG')
print("哈哈， 五彩斑斓的黑大功告成！")
img.show()

Result

Final image:

Full code

#!/bin/env python
# coding: utf-8
# author: ZhangTao
# Date  : 2019/12/12
#  五彩斑斓的黑

from PIL import Image
import random

width = 512
height = 512
# 图片大小为 512x512
img = Image.new('RGBA', (width, height), (0, 0, 0, 255))

# 预设7中颜色，后面随机生成像素点颜色要用到
colors = [
    # 赤
    (255, 0, 0, 255),
    # 橙
    (255, 128, 0, 255),
    # 黄
    (255, 255, 0, 255),
    # 绿
    (0, 255, 0, 255),
    # 青
    (0, 255, 255, 255),
    # 蓝
    (0, 0, 255, 255),
    # 紫
    (128, 0, 255, 255)
]

# 设定挑选的点概率 0.01 就是1%
percent = 0.01
# 遍历 512x512 图像的所有像素点
for i in range(512):
    for j in range(512):
        # 因为 random.random() 产生的随机数是 0到 1 之间均匀分布的
        # 就直接用 random.random()产生随机值是 0 到 percent之间的就改变颜色
        if random.random() <= percent:
            # 从预设的colors颜色列表中随机挑选一个颜色
            rgba = random.choice(colors)
            # 设定坐标颜色
            img.putpixel((j, i), rgba)

img.save('c.png', 'PNG')
print("哈哈， 五彩斑斓的黑大功告成！")
img.show()