It really depends on what java printing and the printer driver do... our
code is the same.
If I'd have a choice, I'd always use dpi=0 which will take the native
printer resolution. This can be higher than 600dpi.
Yes, using a specific dpi means that the print job will get bigger and
bigger. Doing that means that an image is created first, and that one is
rendered.
I tried printing from PDFDebugger which uses default settings (dpi = 0)
and can confirm that the color parts look blurry in XPS. (Btw these are
NOT images, the only image is the printer symbol) However I did it with
CIB PDF brewer (i.e. I printed to a PDF file) and it looks fine. I also
tried to print the XPS file with CIB but then I got a null pointer
error, so I can't test that one (this is a bug in XPS or in CIB). I
wanted to do that to find out whether the contents of the XPS file are
bad, or just the display. Please try this yourself. A software similar
to CIB is e.g. PDF Creator.
Tilman
Am 08.01.2016 um 16:46 schrieb Tres Finocchiaro:
Correction....
To be able to represent this visually, I've taken the following picture of
a rendering done using each approach and sent to the XPS Document writer:
** *http://i.imgur.com/nBaaJoP.png *(i had incorrectly marked each
rendering)*
- [email protected]
On Fri, Jan 8, 2016 at 10:44 AM, Tres Finocchiaro <
[email protected]> wrote:
Hi,
I'm trying to determine the best way to achieve high resolution PDF
printing with PDFBOX 2.0.
Our programmer recently wrote some logic to use PDFPrintable but I noticed
the fonts were rasterized, so I started converting the code to use
PDFPageable instead (since we had upgraded from a system which used
silentPrint()). However, I'm having mixed results.
What I've found is:
- When DPI (such as 600dpi) is provided as a parameter to PDFPageable,
the images render much nicer, but the fonts get rasterized.
- Rasterizing the fonts seems to make the print job much, much
larger.
- Rasterizing the fonts is observable at a high zoom factor (not
observable to the naked eye).
- When the default DPI is provided (AFAIK, Zero, or simply omitted),
the images render quite grainy, but the fonts appear vector.
To be able to represent this visually, I've taken the following picture of
a rendering done using each approach and sent to the XPS Document writer:
http://i.imgur.com/JlTpGht.png
The PDF we're using is available for preview and download here:
https://github.com/qzind/qz-print/blob/2.0/assets/pdf_sample.pdf
So the question is, why does a higher DPI have a negative effect on
rendering? Are we not using this improperly? Thanks in advance!
-Tres
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