Option for conversion to PNG

Hi, This plugin looks great, well made. I think it would be useful to have an option on the settings page to convert to PNG rather than JPG. In my opinion most PDFs are graphical in nature (simple colours) so PNG would be a closer match for compression/quality; JPG is generally better for photographs.

I see you have some code published for implementing this as a filter, but I’d rather not be editing functions.php to configure plugins

https://wordpress.org/plugins/pdf-image-generator/