Option to set barcode image resolution?

First of all, thank you for this great module, I am finding it hugely useful! I'm using it to create printable PDF tickets to email to event attendees, which will be scanned at the event and checked against their name and ID.

The one thing that I would find very helpful as far as creating a more refined appearance in the tickets is if the image resolution was higher -- the fonts come out looking jagged when they're printed. It would be great to have the option of creating the barcode images at 300dpi as well as the standard 72dpi.

Thanks for your time and consideration!