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Blind Watermark
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Last updated: 2024-02-02 15:51:37
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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