[Taxacom] Page size of BHL generated PDFs

[Dean Pentcheff]

Apologies in advance for doing this all in English units, but it's what we
are stuck with in the U.S.

For the journal I looked at, I think the page height is really about 10"
and had a BHL image height of 2378 pixels. Hence it looks as though the
pages are scanned at about 250 dots per inch (based on the single example I
picked [N=1 science at its finest]).

If we assume that the PDF-constructor somewhere slaps in a resolution of 72
dots per inch (common for screen displays), then that yields the roughly
3.5x enlargement of the resulting document.

I suspect there's a setting in iTextSharp (which BHL is using to do the PDF
generation) that needs to be tweaked to supply the actual dots-per-inch of
the scan, preventing the default 72 dots-per-inch from being imposed on the
document.

-Dean
-- 
Dean Pentcheff
pentcheff at gmail.com
dpentche at nhm.org


On Wed, Mar 27, 2013 at 1:31 PM, Dilrukshan Wijesinghe <
dpwijesinghe at yahoo.com> wrote:

> Yes, of course, you can adjust the page size via your PDF reader's page
> magnification/zoom setting or scale the pages for printing.
>
> But my point is that if I get BHL to generate a PDF and then view that PDF
> at 100% magnification the pages of the publication appear very much larger
> than they should be, requiring adjusting the PDF reader's magnification to
> 25%-50%. The preliminary pages which BHL adds to a PDF (BHL logo and source
> reference) are not affected and remain at normal size. The fact that there
> IS a problem is obvious if I compare the size of these preliminary pages
> and the size of the publication pages.
>
>
> Perhaps someone connected with from BHL can comment?
>
> Priyantha
>
>
> D. P. Wijesinghe
> dpwijesinghe at yahoo.com
>
>
>
> ________________________________
>  From: "metzlere at msu.edu" <metzlere at msu.edu>
> To: taxacom at mailman.nhm.ku.edu
> Cc: dpwijesinghe at yahoo.com
> Sent: Wednesday, March 27, 2013 2:46 PM
> Subject: [Taxacom] Page size of BHL generated PDFs
>
>
>
> Dear Priyantha,
>
> I tried to duplicate your situation by going to the link you gave.  I use
> Adobe PDF X Pro, and everything worked just fine.  The PDF Reader allows me
> to adjust ths size of the page on the screen which gave me complete
> flexibility.
>
> I can save the PDF to my hard drive for later editing.
>
> If I want to print the page to my printer, my printer allows me to scale
> the page size so that bigger pages cn be reduced o fit.
>
> And, lastly, PDF files can be opened in Adobe Photoshop for resizing.
>
> Based on my experience and software, I find that BHL needs no adjustment.
>
> I understand frustration when things don't work the way you want.  Good
> luck.
>
> Eric
>
> Eric H. Metzler
> Alamogordo NM
> metzlere at msu.edu
>
>
> Dilrukshan Wijesinghe dpwijesinghe at yahoo.com via msu.edu   11:34 AM (56
> minutes ago)
> to Steve, taxacom
> No, I am not scanning actual hardcopies, I am simply using BHL's PDF
> generating capability. If you have used this feature you might know that
>  you can select a range of pages (for example, a specific paper) from a
>  periodical in the BHL collection, e.g. Annals and Magazine of
> Natural History (http://www. biodiversitylibrary.org/bibliography/15774#/summary) and BHL will generate a PDF and email you the
> link for downloading the
> PDF. This is a very useful feature since you can build your own
>  collection of PDFs of the older taxonomic literature that might be of
>  interest to you. This feature used to work fine before but my recent
>  attempts have all
> resulted in page sizes much larger than the original. Not sure what
> needs to be adjusted on BHL.
>
> Priyantha
>
>
> D. P. Wijesinghe
> dpwijesinghe at yahoo.com
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