I have a 300 page PDF document that was delivered to me as a file rendered 
at 72 dpi but with relatively large (19 x 30 inch) individual pages. What 
I'd like toi do is batch convert that to 300 dpi at proportionally reduced 
page size. Is that doable? 

John Smith wrote:
> I have a 300 page PDF document that was delivered to me as a file rendered 
> at 72 dpi but with relatively large (19 x 30 inch) individual pages.

I have never understood what people mean when they say
they have a PDF with a resolution of 72 dpi.
There is no such thing as 'dots per inch' in a PDF file.
Therefore I think the following question is absurd:

  What
> I'd like toi do is batch convert that to 300 dpi at proportionally reduced 
> page size. Is that doable? 

Unless you are talking about the IMAGES inside the PDF file?
br,
Bruno

Exactamente, Bruno. That's why I specified that it is image only, along with 
the page size and resolution gleaneded from opening pages in Photoshop. One 
can change the images a page at a time in Photoshop, but damn, that's a slow 
way to go.

"bruno" <bruno.lowagie@ugent.be> wrote in message 
news:e5jdcf$mg3$1@gaudi2.UGent.be...
> John Smith wrote:
>> I have a 300 page PDF document that was delivered to me as a file 
>> rendered at 72 dpi but with relatively large (19 x 30 inch) individual 
>> pages.
>
> I have never understood what people mean when they say
> they have a PDF with a resolution of 72 dpi.
> There is no such thing as 'dots per inch' in a PDF file.
> Therefore I think the following question is absurd:
>
>  What
>> I'd like toi do is batch convert that to 300 dpi at proportionally 
>> reduced page size. Is that doable?
>
> Unless you are talking about the IMAGES inside the PDF file?
> br,
> Bruno 

John Smith wrote:
> Exactamente, Bruno. That's why I specified that it is image only,

I didn't read that in your mail.

  along with
> the page size and resolution gleaneded from opening pages in Photoshop. One 
> can change the images a page at a time in Photoshop, but damn, that's a slow 
> way to go.

Can't you just change the value of the 'user unit' in the PDF?
br,
Bruno

Hi,

On Wed, 31 May 2006 05:37:11 -0700 "John Smith"
<prometheusN0SPAM2003@cox.net> wrote:

> Exactamente, Bruno. That's why I specified that it is image only,
> along with the page size and resolution gleaneded from opening pages
> in Photoshop. One can change the images a page at a time in
> Photoshop, but damn, that's a slow way to go.

So when you said you want to go from 72 to 300dpi you meant that you
want to resize your pages by a factor of 72/300 w/o touching pixel
data. Of course this _is_ doable. Programmatically using iText, pdflib
or whatnot; for a ready-made "executable" see Multivalent's "Impose"
tool, you can specify "-dim 1x1" and an arbitratry page size (not a
zoom factor, which would be better here).

If you ever came across Java/.net programming, I'd suggest using iText
and adopting a simple PdfStamper example to your needs.

-hwh

"John Smith" <prometheusN0SPAM2003@cox.net> wrote in message
news:Wg6fg.10886$KB.3610@fed1read08...
> I have a 300 page PDF document that was delivered to me as a file rendered
> at 72 dpi but with relatively large (19 x 30 inch) individual pages. What
> I'd like toi do is batch convert that to 300 dpi at proportionally reduced
> page size. Is that doable?

Most printer drivers have the option to scale down. Print it to a pdf
printer and you'll have a pdf again, hopefully *without* any resampling
though.

[Jongware]