Feature: Add support for Image/Logo Watermarks

[Anubhav-Mondal]

Description

Currently, the tool only supports adding text-based watermarks to PDF files. This issue proposes adding a feature that allows users to upload an image (PNG or JPEG) to be used as a watermark. This is essential for branding and corporate document security.

Implementation Hints

1. Use pdfDoc.embedPng or pdfDoc.embedJpg to load the image bytes.

2. Utilize page.drawImage() with the opacity and transformation parameters.

3. Calculate the aspect ratio to prevent image stretching during scaling.

Suggested Labels

NSoC'26, enhancement

[Anubhav-Mondal]

Hi, @JhaSourav07 I would like to work on this issue. Please assign me.

[JhaSourav07]

@Anubhav-Mondal

Sure I am assigning this to you.