将整数数组解码为PNG (JavaScript，node.js)

const fs = require('fs');
const { createCanvas, loadImage } = require('canvas');

function decodeIntArrayToPNG(intArray, width, height, outputPath) {
  const canvas = createCanvas(width, height);
  const context = canvas.getContext('2d');

  // 将整数数组转换为图像数据
  const imageData = context.createImageData(width, height);
  for (let i = 0; i < intArray.length; i++) {
    const value = intArray[i];
    const r = (value >> 16) & 0xFF;
    const g = (value >> 8) & 0xFF;
    const b = value & 0xFF;
    const a = 255; // 设置透明度为255，不透明
    const pixelIndex = i * 4;
    imageData.data[pixelIndex] = r;
    imageData.data[pixelIndex + 1] = g;
    imageData.data[pixelIndex + 2] = b;
    imageData.data[pixelIndex + 3] = a;
  }

  // 将图像数据绘制到画布上
  context.putImageData(imageData, 0, 0);

  // 将画布保存为PNG文件
  const buffer = canvas.toBuffer('image/png');
  fs.writeFileSync(outputPath, buffer);
}

// 示例用法
const intArray = [16711680, 65280, 255]; // RGB颜色值对应的整数数组
const width = 3;
const height = 1;
const outputPath = 'output.png';
decodeIntArrayToPNG(intArray, width, height, outputPath);