Articles pages: (The articles are just for graphic editing software engineer to accumulate knowledge to design better software for the end customers. They are not well-organized.)
Related knowledge of photo editing software:
Image To PDF (PDF E-Book Maker) introduction
How to Convert Image to Pdf with Image2pdf
How to Convert PDF to Image Files
Why should you convert JPEG images into PDF documents?
How can you convert JPEG images into PDF documents?
Convert JPEG Photographs into PDF Documents
How to Convert JPG Files to PDF Files for Free
How to Convert PNG files to PDF