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    Blind Watermark

    Last updated: 2024-02-02 15:51:37
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      Overview

      This document provides an overview of APIs and SDK code samples for blind watermarking.
      API
      Description
      Adds a blind watermark to or extracts a blind watermark from a local image and uploads the image to a bucket.

      Adding Blind Watermark

      Feature description

      You can add a blind watermark when uploading or downloading an object.

      Sample 1: Adding a blind watermark during upload

      opt := &cos.ObjectPutOptions{
          nil,
          &cos.ObjectPutHeaderOptions{
              XOptionHeader: &http.Header{},
          },
      }
      pic := &cos.PicOperations{
          IsPicInfo: 1,
          Rules: []cos.PicOperationsRules{
              {
                  FileId: ".jpg",
                  Rule:   "watermark/3/type/3/text/" + base64.StdEncoding.EncodeToString([]byte("testwatermark")),
              },
          },
      }
      opt.XOptionHeader.Add("Pic-Operations", cos.EncodePicOperations(pic))
      name := "test.jpg"
      filepath := "./test.jpg"
      res, _, err := c.CI.PutFromFile(context.Background(), name, filepath, opt)

      Sample 2: Adding a blind watermark during download

      name = "test.jpg"
      filepath := "watermark.jpg"
      _, err = c.CI.GetToFile(context.Background(), name, filepath, "watermark/3/type/3/text/"+base64.StdEncoding.EncodeToString([]byte("testwatermark")), nil)

      Extracting Blind Watermark

      The request for extracting a blind watermark is the same as that used to simply upload a file to COS, except that you need to add the image processing parameter Pic-Operations to the request header and use the blind watermark extraction parameter watermark/4.

      Sample request

      opt := &cos.ObjectPutOptions{
          nil,
          &cos.ObjectPutHeaderOptions{
              XOptionHeader: &http.Header{},
          },
      }
      pic := &cos.PicOperations{
          IsPicInfo: 1,
          Rules: []cos.PicOperationsRules{
              {
                  FileId: "format2.jpg",
                  Rule:   "watermark/4/type/3/text/" + base64.StdEncoding.EncodeToString([]byte("testwatermark")),
              },
          },
      }
      opt.XOptionHeader.Add("Pic-Operations", cos.EncodePicOperations(pic))
      name := "test2.jpg"
      _, err := c.Object.PutFromFile(context.Background(), name, filepath, opt)
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