图片字符画

复制from PIL import Image

# 将图片转为灰度 ASCII 字符画（亮度映射）
img = Image.open('input.jpg').convert('L')  # 转灰度
width, height = 80, 40
img = img.resize((width, height))

# 字符集从暗到亮
chars = '@%#*+=-:. '
pixels = list(img.getdata())

# 每个像素亮度 0-255 映射到字符索引
result = ''
for i, p in enumerate(pixels):
    idx = p * (len(chars) - 1) // 255
    result += chars[idx]
    if (i + 1) % width == 0:
        result += '\n'

print(result)

复制package main

import (
	"fmt"
	"image"
	_ "image/jpeg"
	"os"
)

func main() {
	f, _ := os.Open("input.jpg")
	defer f.Close()
	img, _, _ := image.Decode(f)

	bounds := img.Bounds()
	w, h := 80, 40
	scaleX := float64(bounds.Dx()) / float64(w)
	scaleY := float64(bounds.Dy()) / float64(h)

	chars := "@%#*+=-:. "
	for y := 0; y < h; y++ {
		for x := 0; x < w; x++ {
			// 取采样点像素的灰度值
			px := int(float64(x)*scaleX + scaleX/2)
			py := int(float64(y)*scaleY + scaleY/2)
			r, g, b, _ := img.At(px, py).RGBA()
			gray := (r*299 + g*587 + b*114) / 1000 >> 8
			idx := gray * (len(chars) - 1) / 255
			fmt.Print(string(chars[idx]))
		}
		fmt.Println()
	}
}

复制// 浏览器端：Canvas 读取图片像素生成 ASCII
const img = new Image();
img.src = 'input.jpg';
img.onload = () => {
  const canvas = document.createElement('canvas');
  const ctx = canvas.getContext('2d');
  const w = 80, h = 40;
  canvas.width = w;
  canvas.height = h;
  ctx.drawImage(img, 0, 0, w, h);

  const imageData = ctx.getImageData(0, 0, w, h);
  const pixels = imageData.data;
  const chars = '@%#*+=-:. ';
  let result = '';

  for (let y = 0; y < h; y++) {
    for (let x = 0; x < w; x++) {
      const idx = (y * w + x) * 4;
      // 灰度 = 0.299R + 0.587G + 0.114B
      const gray = (pixels[idx] * 299 + pixels[idx+1] * 587 + pixels[idx+2] * 114) / 1000;
      const charIdx = Math.floor(gray * (chars.length - 1) / 255);
      result += chars[charIdx];
    }
    result += '\n';
  }
  console.log(result);
};