print an image via percentage

DO THIS FIRST then print.   I'd make a copy of the image scaled down to 59% SAVE and PRINT that.
Try not to wrap your head around printing at an exact size- all the information is in the image- make it whatever sze you want.

for example:  If you are printing up a greeting card- just add the image then grab a cornerr control node- the little whit box on a corner and make it whatever size you need. 

Your options are based upon the printer you have.   

You have two printer interfaces:  the one built into the program- which is somewhat limited, and the one which all your programs uses, a system printer interface.  

I have two printers:  a color lazerjet- which allows scaling on a print, and an inkjet, which does not. 

I would just save the image to a place you can find, and then print it using your system printer interface (which is the one I show just above this comment)--- choices and options vary based upon the printer you have.

Below is how you might want to do it from within the program.   Do whatever makes you happy.