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From: Lachezar Dobrev <l.dobrev@gmail.com>
Date: Mon, 18 Jul 2016 14:36:28 +0300
Message-ID: <CA+xsaB1FnkXeziU5J7e7hMAS6KmHsutNmTsajJOAcYe2isnOEg@mail.gmail.com>
Subject: Re: Bolding, enhancing fonts when converting to image.
To: users@pdfbox.apache.org
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archived-at: Mon, 18 Jul 2016 11:36:36 -0000

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  Sorry for the late response.

  The idea to try the bold font variants arose due to the fact that the
parts of the label that had bold fonts looked fine as opposed to the
regular variants.

  Anyway, the solution I went with was rendering the image at 1-to-1 (not
up-scaled), but move the black-point for the grey pixels up to about 5/1,
so that more pixels became black, which looks acceptable. I was unable to
persuade our partners to return larger or bold fonts.


2016-06-30 18:29 GMT+03:00 John Hewson <john@jahewson.com>:

>
> > On 28 Jun 2016, at 08:36, Tilman Hausherr <THausherr@t-online.de> wrote:
> >
> > I realize my answer from yesterday was possibly wrong, because a bold
> font may have different metrics (glyph sizes) than his non-bold
> counterpart. That would have to be checked first.
> >
> > Now if all files come from the same sources and have the same structure,
> you could go through the font resources and change names like
> AAAAAD+DejaVuSans to AAAAAD+DejaVuSans-Bold.  Very dirty.
>
> You could but I suspect that bold fonts too are going to still suffer from
> rendering problems at low DPI.
>
> -- John
>
> > Tilman
> >
> >
> >> Am 28.06.2016 um 14:06 schrieb Lachezar Dobrev:
> >>   I am not expecting anything to do with the library code changing.
> >>   I was hoping there is some bulk-font-change technique that I can do
> with
> >> the PDF after loading, so that text with normal font starts using the
> bold
> >> one. Like iterating the document tree and doing something with it before
> >> rendering the pages.
> >>
> >> 2016-06-27 19:39 GMT+03:00 Tilman Hausherr <THausherr@t-online.de>:
> >>
> >>>> Am 27.06.2016 um 18:10 schrieb Lachezar Dobrev:
> >>>>
> >>>>    Hey all,
> >>>>
> >>>>    I need to print PDFs to images to be forwarded to a low-resolution
> >>>> printer (200 dpi).
> >>>>    Printing works (Yay!), and the ability to specify colour space and
> >>>> resolution helps immensely.
> >>>>
> >>>>    When reading the PDFs I get these error messages:
> >>>>
> >>>> VI 27, 2016 5:53:39 PM
> org.apache.pdfbox.pdmodel.font.PDCIDFontType2Font
> >>>> getawtFont
> >>>> INFO: Can't read the embedded font AAAAAC+DejaVuSans-Bold
> >>>> VI 27, 2016 5:53:39 PM
> org.apache.pdfbox.pdmodel.font.PDCIDFontType2Font
> >>>> getawtFont
> >>>> INFO: Using font DejaVu Sans Bold instead
> >>>> VI 27, 2016 5:53:39 PM
> org.apache.pdfbox.pdmodel.font.PDCIDFontType2Font
> >>>> getawtFont
> >>>> INFO: Can't read the embedded font AAAAAD+DejaVuSans
> >>>> VI 27, 2016 5:53:39 PM
> org.apache.pdfbox.pdmodel.font.PDCIDFontType2Font
> >>>> getawtFont
> >>>> INFO: Using font DejaVu Sans instead
> >>>>
> >>>>    This looks like something I can live with (fonts being
> substituted),
> >>>> but
> >>>> I'm willing to work on that, since text is not Latin, and missing
> glyphs
> >>>> in
> >>>> system available fonts is a thing.
> >>>>
> >>>>
> >>>>    However due to the low resolution, the fact that the printer is
> >>>> Black-And-White (not Gray-Scale!) much of the text becomes grainy and
> >>>> disconnected (thin parts of the letters missing), making the text
> >>>> extremely
> >>>> hard to read.
> >>>>
> >>>>    Is there any way to make all fonts bold (or bold-er), so that the
> text
> >>>> (after being converted to black-and-white) would be easier to read
> when
> >>>> printed in low-resolution? I can not perform any post-rendering
> >>>> enhancements, because there are bar-codes in the printed content that
> >>>> become unreadable if smeared or thickened.
> >>>>
> >>>>    I'm fixed to using PDFBox 1.8.1 (that's what's available in the
> >>>> project).
> >>>>
> >>>> There's nothing that can be done in PDFBox, as you are bound to a
> version
> >>> (and I assume you can't modify it) and there is no feature like you
> >>> describe. You could replace the font in the font directory but this
> would
> >>> likely have sideeffects on other applications.
> >>>
> >>>
> >>> Tilman
> >>>
> >>>
> >>>
> >>>
> >>>
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