Digital BW, The Print

My margins on 16 in. roll paper came out to a max 15.35 in. width, 
and I need 15.6 in. to use pre-cut 16x20 in. mats! 

Can someone tell me if/how to print as close to 16 in. width as 
possible?   I don't know what the prints margins are, and also using 
the custom paper size set-up...? 

Thanks in advance! 
SteveB  


--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Andrew Unger" 
<ungram@f...> wrote:
> 
> --- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Stephen 
> Billard" <stephenb@S...> wrote:
> > QTR should be centering the image on the physical page if you 
check
> > "Centered". Is this not what is happening?
> 
> My image on letter size was was just over 10" (255mm)x7.25"  
> (185mm), landscape.  With center checked and to fit unchecked and 
> image reduced to 96% the left margin was 13.5mm, the right was 
> 9.5mm, top was 16.5mm and bottom was 13mm.  Using my eyeballing 
> method proved different but no better.  After considering this I 
> noticed that all sizes of paper share minimum margins of .125 on 
the 
> long side and .556 on the short side. This obviously must be taken 
> into consideration in determining the maximum size of the image.  
> 
> Andrew