Re: PDF DPI

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Ray Wadkins wrote:
> I understand about dpi and image quality for printing.  My images are 
> the right size.  My problem was that I had (possibly,
> incorrectly) assumed that the page size needed to be 8.5 * 300 by 11 * 
> 300.  But when the press operator opened the file, he got a file with 
> larger dimensions than I intended because (I believe) the file was 
> assumed to be 72dpi instead of my 300.  I was hoping to change what that 
> assumption was. 

PDF is a resolution-independent format. You don't need to specify or 
set, or even imply a resolution.

The size of the PDF should be 8.5 x 11. Everything goes in that at the 
size you'd like it to come out the other end.

The only thing you need to be careful of is images. From the 
documentation for PDF::API2::Content 
(http://search.cpan.org/~areibens/PDF-API2-0.73/lib/PDF/API2/Content.pm)

 > Per default this has a 72dpi resolution, so if you want an image to 
have a 150 or 300dpi resolution, you should specify a scale of 72/150 
(or 72/300) or adjust width/height accordingly.

So if you have a bitmap'd image in your PDF, it will come in as if the 
resolution (of the image) was 72dpi. If you want it to be 300dpi then 
you need to scale it to 72/300.

(By the way, there's not much use in using a resolution over 200 for 
full color printing and over 150 for black and white printing unless 
you're printing at *very* high line-screens or if the bitmaps are 
graphics rather than photos. And if they're graphics, I'd be pushing 
toward the 600dpi range)

Cheers!
Rick Measham

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