Injecting Watermarks to Images

Prerequisites

• OBS asset access permissions are granted. For details, see Allowing or Disallowing Access to Cloud Assets.
• OBS has been enabled and used.
• Currently, the following image format is supported: .jpg, .jpeg, .jpe, .png, .bmp, .dib, .rle, .tiff, .tif, .ppm, .webp, .tga, .tpic, .gif.

Constraints

• The maximum size of an image is 20 MB.
• The resolution of the image to be watermarked must be greater than 128 x 128 pixels.
• The maximum length of the invisible text watermark is 32 characters.

Injecting Watermarks into OBS Bucket Files

1. Log in to the management console.
2. Click in the upper left corner and select a region or project.
3. In the navigation tree on the left, click . Choose Security and Compliance > Data Security Center .
4. In the navigation tree on the left, choose Data Asset Protection > Image Watermarking. The Image Watermarking page is displayed.
5. Choose OBS Bucket File > Inject Watermark to configure watermark injection for OBS bucket files.
6. Set the path in the File Settings area, as shown in Figure 1.
   Figure 1 File settings
   
   1. Click Add next to Original image path to select the cloud path of the original images. The size of the selected image cannot exceed 20 MB.
   2. Click Add next to Storage destination path to select the destination storage path.
   3. Click the Save Target File Name text box and enter the name of the watermarked image file. The file name contains a maximum of 32 characters, and the file name extension is *.jpg, *.jpeg, *.jpe, *.png, *.bmp, *.dib, *.rle, *.tiff, *.tif, *.ppm, *.webp, *.tga, *.tpic, or *.gif.

7. Watermark type can be visible watermark and invisible watermark.
   • Visible watermark: The watermark content is displayed on the image, as shown in Preview Visible Watermark. Figure 2 describes the related parameters.

     Table 1 Configuring a visible watermark

     Parameter	Description
     Watermark Content	Select the Watermark Content from the drop-down list box. Image watermark Text watermark.
     Image Path	If Watermark Content is set to Image watermark, click Add to select an image on the cloud as the watermark. The watermark image must be in the same area as the original image. Otherwise, the preview fails.
     Text Content	If Watermark Content is set to Text Watermark, click the text box and enter the text watermark content. The value contains 1 to 32 characters.
     Watermark Position	Select the position where the watermark is injected.
     Image Size	Absolute size of the image to be injected. This parameter is displayed when Watermark Content is set to Image watermark. The value ranges from 0 to 100.
     Watermark Size	Size of the text watermark to be injected. This parameter is displayed when Watermark Content is set to Text watermark. The value ranges from 1 to 100.
     Watermark Transparency	Transparency of the watermark to be injected. The value ranges from 1 to 100.
     Horizontal Margin	Horizontal margin of the watermark to be injected relative to the image. The value ranges from 0 to 100.
     Vertical Margin	Vertical margin of the watermark to be injected relative to the image. The value ranges from 0 to 100.
     Font Color	This parameter is displayed when Watermark Content is set to Text watermark. You can click the color bar to select the font color of the text watermark to be injected.

     Figure 2 Configuring a visible watermark
     
   • Invisible watermark: The watermark text is invisible and needs to be extracted using tools. For details about how to extract an invisible watermark, see Extracting Watermarks from Images.
     

     For effective watermark embedding, the resolution of the watermark image should be at least 64 x 64 pixels. Upon extraction, the watermark will be displayed as a downscaled version, resized to precisely 64 x 64 pixels.

     Table 2 Configuring an invisible watermark

     Parameter	Description
     Watermark Content	Select the Watermark Content from the drop-down list box. Image watermark Text watermark.
     Text Content	If Watermark Content is set to Text Watermark, click the text box and enter the text watermark content. The value contains 1 to 32 characters.
     Image path	If Watermark Content is set to Image watermark, click Add to select an image on the cloud as the watermark.

     Figure 3 Configuring an invisible watermark
     

8. After parameters are configured, click OK. The file with watermark injected is automatically downloaded to the specified path on the local PC.
   

   • If you injected a visible watermark, open the target file to view the watermark.
   • If you injected an invisible watermark, extract the watermark from the target file using tools. For details, see Extracting Watermarks from Images.

9. Click Preview to preview the watermark effect in the visible watermark preview area on the right. The invisible watermark cannot be previewed.
10. Click OK to complete watermark injection.

Creating a Local File Watermark Injection Task

1. Log in to the management console.
2. Click in the upper left corner and select a region or project.
3. In the navigation tree on the left, click . Choose Security and Compliance > Data Security Center .
4. In the navigation tree on the left, choose Data Asset Protection > Image Watermarking. The Watermark Injection page is displayed.
5. Click the Local File tab. The Watermark Injection page is displayed.
6. Click Add File to select the image to be watermarked. The image size cannot exceed 20 MB.
7. Watermark type can be visible watermark and invisible watermark.
   • Visible watermark: The watermark content is displayed on the image, as shown in Preview Visible Watermark.
   • Invisible watermark: The watermark text is invisible and needs to be extracted using tools. For details about how to extract an invisible watermark, see Extracting Watermarks from Images.

8. Set the watermark parameters according to Table 3.

   Table 3 Watermark settings

   Watermark Type	Parameter	Description
   Visible watermark	Watermark Content	Select the watermark content from the drop-down list box. Image watermark Text watermark.
   	Watermark Image	When Watermark Content is set to image watermark, click Add File to add a local image as the watermark. The watermark image must be in the same area as the original image. Otherwise, the preview fails.
   	Text Content	This parameter is displayed when Watermark content is set to Text watermark. Click the text box to enter the text watermark content. The text watermark contains 1 to 32 characters.
   	Watermark Position	Select the position where the watermark is injected.
   	Image Size	Absolute size of the image to be injected. This parameter is displayed when Watermark Content is set to Image watermark. The value ranges from 0 to 100.
   	Watermark Size	Size of the text watermark to be injected. This parameter is displayed when Watermark Content is set to Text watermark. The value ranges from 1 to 100.
   	Watermark Transparency	Transparency of the watermark to be injected. The value ranges from 1 to 100.
   	Horizontal Margin	Horizontal margin of the watermark to be injected relative to the image. The value ranges from 0 to 100.
   	Vertical Margin	Vertical margin of the watermark to be injected relative to the image. The value ranges from 0 to 100.
   	Font Color	This parameter is displayed when Watermark Content is set to Text watermark. You can click the color bar to select the font color of the text watermark to be injected.
   Invisible watermark	Watermark Content	Select the watermark content from the drop-down list box. Image watermark Text watermark.
   	Watermark Image	This parameter is displayed when Watermark Content is set to Image watermark. Click Add File to select a local image as the watermark.
   	Text Content	This parameter is displayed when Watermark Content is set to Text watermark. Click the text box to enter the watermark text content.

9. After parameters are configured, click OK. The file with watermark injected is automatically downloaded to the specified path on the local PC.
   

   • If you injected a visible watermark, open the target file to view the watermark.
   • If you injected an invisible watermark, extract the watermark from the target file using tools. For details, see Extracting Watermarks from Images.