I am currently writing an program that allows users to use their own image to stamp a PDF document. Users can load a PDF file from local disk, stamp it with an image, and save back. In addition to stamping PDF, users can control the size of image and the location of on PDF document.

In my previous searches, i should create a stamp, set its size, and position it to a PDF document page. There is nothing wrong with these operations.

Till now, i have successfully mark an existing PDF document with a user-provided image. And the stamp is correctly positioned on the PDF page. However, an error is reported when i set the stamp size. I cannot get it as required size.

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Answers

According to your description, problems below may related to your project.

• Image transparency issues. Maybe your PDF document does not support transparency.
• Bug comes while adding image to PDF. Image size setting may be ignored in your project.

Try XsPDF!

You can choose to insert stamp image directly into PDF document. And image size setting can be easily implemented. Alternatively, you can choose to use XsPDF PDF singing feature to sign pdf with image directly. (see online tutorials from the upper links).