On Apr 12, 2011, at 20:02, Randy Parker wrote:
> On Tue, Apr 12, 2011 at 1:01 PM, Christiaan Hofman <[email protected]> wrote:
>
> On Apr 12, 2011, at 18:53, Randy Parker wrote:
>
> > I suspect that my pdf files have wildly different resolutions, but I don't
> > know how to be sure. Is there a way to display the resolution? If there
> > is not already a simple way, is it a difficult metric to expose?
> >
> > - Randy
>
> A PDF does not have a resolution, it is essentially a vector graphics format.
> It can contain bitmap images, which have a resolution, but that's content,
> not properties of the PDF as a whole, and we have no information about any of
> it.
>
>
> Thank you for the explanation.
>
> I have dozens of single-page blank forms as pdf files that vary in size from
> 8kB to 356 kB. The text density does vary some, but not by a factor of 40,
> so I'm trying to figure out the reason. Perhaps some of them have text
> embedded as images: is there a way to tell if they do? And if they do, how
> large those embedded images are? (I could probably re-create them, replacing
> any such sections with vector text).
>
> I'm interested in this because we print thousands of pages per day from a few
> hundred blank forms per day, and the printer bogs down and even "stalls" for
> 6 - 8 s on pdfs bigger than 1 MB.
>
> - Randy
When you can select the text, it's not an image, otherwise it is (if you're
using the text tool mode). For the rest there can be many reasons why file
sizes differ, though often it's because it contains (large) bitmaps, such as
scanned text. Also encryption (which may be without password) can have
influence on file size and printing performance.
Christiaan
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