Makes sense, let me summarise.

Definition of done

• Add option to PDF configuration panel for transparent background. Makes sure this configuration is also saved in preferences like the others.
• Modify PDF export accordingly

To my understanding and through trial and error this feature does not seem possible! I have exported images from other programs with a "transparent" background, and when the PDF is opened, they white rectangle is drawn in. Changing the alpha to 0 and making the canvas transparent both still resulted in the white rectangle being drawn. I believe this is due to the fact that PDF requires there to be a canvas, as opposed to PNG which acts as a bitmap. This is my current understanding, if you know otherwise please feel free to reach out

Thanks @Meta-Ace. How did you actually check whether the PDF has transparent background? In which program? Based on my own research it does seem that PDFs can have transparent backgrounds.

Come had a program that already supported exporting transparent backgrounds, I don't know which exactly and we selected transparent background for PDF and when we opened it it was a white background. I would have to ask him which program it was.

Hi again, I did a bit more research and was able to create PDF with transparent background. I think you didn't have the proper software to actually check that it's transparent - hence the confusion. I found this trick with Acrobat Reader settings. If you check this it will show a grid when transparent

Then by commenting out line size.setBackgroundColor(new BaseColor(col.getRed(), col.getGreen(), col.getBlue())); on PDFExporter class you should get a transparent background.

Added new checkbox in PDF config menu