Printing to pdf

[jbv at souslelogo.com]

Hi list,

I have a stack with several cards 750 x 1000px.
I am trying to print these cards as pdf, but
according to this lesson
https://lessons.livecode.com/m/4071/l/29177-how-to-create-pdfs-using-livecode
the stack size should be 575 x 800 to fit a A4
document ratio.
Is it possible to "force" the printing to different
sizes, without clipping the content of the cards ?

I tried :
print card x into 0,0,750,1000
but the cards are still clipped.

The pdf I need to build is not for printing, only
for reading on screen.

Thank you in advance.
jbv