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js 图片处理-去除背景

圣杰 2022-02-28 阅读 97
removeImgBgFromLoadedImage(img) {
      const rgba = [0, 0, 0, 255];
      const tolerance = 180;
      var imgData = null;
      const [r0, g0, b0, a0] = rgba;
      var r, g, b, a;
      const canvas = document.createElement('canvas');
      const context = canvas.getContext('2d');
      const w = img.width;
      const h = img.height;
      canvas.width = w;
      canvas.height = h;
      context.drawImage(img, 0, 0);
      imgData = context.getImageData(0, 0, w, h);
      for (let i = 0; i < imgData.data.length; i += 4) {
        r = imgData.data[i];
        g = imgData.data[i + 1];
        b = imgData.data[i + 2];
        a = imgData.data[i + 3];
        const t = Math.sqrt((r - r0) ** 2 + (g - g0) ** 2 + (b - b0) ** 2 + (a - a0) ** 2);
        if (t > tolerance) {
          imgData.data[i] = 0;
          imgData.data[i + 1] = 0;
          imgData.data[i + 2] = 0;
          imgData.data[i + 3] = 0;
        }
      }
      context.putImageData(imgData, 0, 0);
      const newBase64 = canvas.toDataURL('image/png');
      console.log("newBase64", newBase64);
      this.dataURLtoBlob(newBase64)
    },
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