JPEG is the most common and popular bitmap format. The form got its name from the name of the organization-developer Joint Photographic Experts Group. Files of this format are used today in all digital cameras and cameras. They have a good compression ratio and support 24-bit color depth. Since such compression significantly reduces image size with virtually no loss of quality, JPEG format is widespread on the Internet. However, the stronger the compression, the worse the quality. In addition, the JPEG format does not support the transparency option.
PDN is a proprietary raster image format that Paint.NET software uses. Paint.NET is free, and you can use it to edit photos for Windows from Microsoft. Often it is positioned as a replacement for MS Paint. It has considerable potential for image processing. The PDN file format, or Paint.NET Image File, was created by the developer Rick Brewster. The format supports a variety of levels, different layers, transparency options, image effects, various bit depths. Using Paint.NET you can only open it. But you can also export files of this format in Paint.NET to a format that is more standard. It is possible to save such a file using Paint.NET in the more popular PNG, JPEG, PSD or GIF formats. Files like PDN or files with the extension .pdn can be converted to PDF without any problems using a PDF printer. This is a virtual printer, and it can be used just like any other printer. It differs from a regular printer in that a PDF printer creates PDF files. You won’t have to print anything on a paper sheet. After all, a PDF printer simply converts the contents of the source file into a PDF file. You only need to open the file with the reader, press the print button, select a virtual PDF printer and click the "Print" button.