Hi,
The type of PDF software you have on your computer, the printer settings you have selected, the size of the image you are saving, and what Snagit feels will print the picture in the best way without compromising the quality.
To use the Print to PDF setting, in Editor, choose Print > Select Printer > Adobe PDF.
In the Printer dialog box, click the Page setup button. Select the options you need. (long captures will automatically be broken up into pages using this option.)
Then, just chose Print!
I hope this works !!!
PS. If you don't have a print option for PDF, you can surf the web and look for a PDF writer... many times you can find one free.