如何通过Vue实现图片的正片叠底和混合模式？

<template>
  <img src="@/assets/image.jpg" alt="image" ref="image" />
</template>

<script>
export default {
  computed: {
    processImage() {
      const canvas = document.createElement("canvas");
      const ctx = canvas.getContext("2d");
      const image = this.$refs.image;
      canvas.width = image.width;
      canvas.height = image.height;

      ctx.drawImage(image, 0, 0);

      const imageData = ctx.getImageData(0, 0, canvas.width, canvas.height);
      const data = imageData.data;

      // 遍历每个像素点
      for (let i = 0; i < data.length; i += 4) {
        const red = data[i]; // 红色通道值
        const green = data[i + 1]; // 绿色通道值
        const blue = data[i + 2]; // 蓝色通道值

        // 计算新的颜色值
        data[i] = red * 0.5;
        data[i + 1] = green * 0.5;
        data[i + 2] = blue * 0.5;
      }

      ctx.clearRect(0, 0, canvas.width, canvas.height);
      ctx.putImageData(imageData, 0, 0);

      return canvas.toDataURL();
    },
  },
};
</script>

<template>
  <img :src="processImage" alt="processed image" />
</template>

<template>
  <div class="blend-mode-container">
    <img src="@/assets/image.jpg" alt="image" />
    <img src="@/assets/mask.png" alt="mask" class="mask" />
  </div>
</template>

<style>
.blend-mode-container {
  position: relative;
}

.mask {
  position: absolute;
  top: 0;
  mix-blend-mode: multiply;
}
</style>