Image watermark does not display on PDF

Aspose.PDF Product Family
1

Hi,

I tried to use the ‘Add Image Watermark to PDF’ feature of Aspose PDF in my environment, following the steps described in the link below:

However, I encountered an issue where the image watermark does not appear in the original PDF.

I also attempted to add a background to a newly created PDF, and in that case, the image watermark displayed correctly. But when working with an original PDF, it seems that the API is not functioning as expected.

I am currently using the following library with a free trial:
Aspose.PDF 23.8 | Process Acrobat PDF Files via Java API

Is this problem possibly caused by the limitations of the trial version?

Thanks.

2

@Rich_Huang

With the trial version, you will only be able to access 4 elements of any collection of the API. However, you can remove this restriction using a 30-days free temporary license. In case issue still persists, please share your sample PDF with us so that we can test the scenario in our environment and address it accordingly.

3

Guiding Questions.pdf (29.7 キロバイト)
@asad.ali
Thank you for your reply. I have applied a temporary license and imported it into our environment.

I have noticed that in some cases, the image watermark displays correctly, but in others, it does not work.

I suspect that this issue may be related to the content of the PDF. I have attached an example PDF file that demonstrates the problem.

Your assistance in investigating this matter would be greatly appreciated.

Rich

4

@Rich_Huang

We apologize for the trouble. Would it be possible if you can please share the image as well that you are using to add the watermark?

5

original.img.png (49.6 キロバイト)
@asad.ali
Thanks for your reply. Please refer to the attachment.

Best regards,
Rich

6

@Rich_Huang

We are checking it and will get back to you shortly.

7

@Rich_Huang

We have opened the following new ticket(s) in our internal issue tracking system and will deliver their fixes according to the terms mentioned in Free Support Policies.

Issue ID(s): PDFJAVA-43168

You can obtain Paid Support Services if you need support on a priority basis, along with the direct access to our Paid Support management team.

8

@Rich_Huang

The reason why image is not displayed - the document already has nontransparent background (white rectangle). And new background is placed after it.
So, to resolve the issue - we recommend to delete redundant rectangle (the first found rectangle is actual background) :

Document doc = new Document(dataDir + "Guiding Questions.pdf");
BackgroundArtifact background = new BackgroundArtifact();
background.setBackgroundImage(new FileInputStream(dataDir + "original.img.png"));

background.setOpacity(0.5);
background.setArtifactHorizontalAlignment(HorizontalAlignment.Center);
background.setArtifactVerticalAlignment(VerticalAlignment.Center);
background.setBackground(false);

Page item = doc.getPages().get_Item(1);
OperatorCollection contents = item.getContents();

for (Operator op : contents) {
    if (op instanceof Re) {
        contents.delete(op.getIndex());
        break;
    }
}

item.getArtifacts().add(background);
doc.save(dataDir + "watermark_23_11_fixed.pdf");

watermark_23_11_fixed.pdf (136.9 KB)