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Posted to users@pdfbox.apache.org by Lachezar Dobrev <l....@gmail.com> on 2016/06/27 16:10:34 UTC
Bolding, enhancing fonts when converting to image.
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).
Re: Bolding, enhancing fonts when converting to image.
Posted by Lachezar Dobrev <l....@gmail.com>.
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 <jo...@jahewson.com>:
>
> > On 28 Jun 2016, at 08:36, Tilman Hausherr <TH...@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 <TH...@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
> >>>
> >>>
> >>>
> >>>
> >>>
> >>> ---------------------------------------------------------------------
> >>> To unsubscribe, e-mail: users-unsubscribe@pdfbox.apache.org
> >>> For additional commands, e-mail: users-help@pdfbox.apache.org
> >
> >
> > ---------------------------------------------------------------------
> > To unsubscribe, e-mail: users-unsubscribe@pdfbox.apache.org
> > For additional commands, e-mail: users-help@pdfbox.apache.org
> >
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@pdfbox.apache.org
> For additional commands, e-mail: users-help@pdfbox.apache.org
>
>
Re: Bolding, enhancing fonts when converting to image.
Posted by John Hewson <jo...@jahewson.com>.
> On 28 Jun 2016, at 08:36, Tilman Hausherr <TH...@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 <TH...@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
>>>
>>>
>>>
>>>
>>>
>>> ---------------------------------------------------------------------
>>> To unsubscribe, e-mail: users-unsubscribe@pdfbox.apache.org
>>> For additional commands, e-mail: users-help@pdfbox.apache.org
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@pdfbox.apache.org
> For additional commands, e-mail: users-help@pdfbox.apache.org
>
---------------------------------------------------------------------
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Re: Bolding, enhancing fonts when converting to image.
Posted by Tilman Hausherr <TH...@t-online.de>.
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.
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 <TH...@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
>>
>>
>>
>>
>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: users-unsubscribe@pdfbox.apache.org
>> For additional commands, e-mail: users-help@pdfbox.apache.org
>>
>>
---------------------------------------------------------------------
To unsubscribe, e-mail: users-unsubscribe@pdfbox.apache.org
For additional commands, e-mail: users-help@pdfbox.apache.org
Re: Bolding, enhancing fonts when converting to image.
Posted by Lachezar Dobrev <l....@gmail.com>.
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 <TH...@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
>
>
>
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@pdfbox.apache.org
> For additional commands, e-mail: users-help@pdfbox.apache.org
>
>
Re: Bolding, enhancing fonts when converting to image.
Posted by Tilman Hausherr <TH...@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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Re: Bolding, enhancing fonts when converting to image.
Posted by Lachezar Dobrev <l....@gmail.com>.
That sounds like a sensible solution.
Lanczos looks a bit over-the-top. I'll probably try the AWT down-scaling
first. Thanks for the pointer.
2016-06-28 0:27 GMT+03:00 John Hewson <jo...@jahewson.com>:
> I'd recommend rendering to an image at a higher DPI (say 4x) and then
> scaling-down that image using lanczos (just Google for a Java
> implementation). Then threshold that image to binary - an adaptive
> threshold might work well here.
>
> -- John
>
> > On 27 Jun 2016, at 09:10, Lachezar Dobrev <l....@gmail.com> wrote:
> >
> > 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).
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@pdfbox.apache.org
> For additional commands, e-mail: users-help@pdfbox.apache.org
>
>
Re: Bolding, enhancing fonts when converting to image.
Posted by John Hewson <jo...@jahewson.com>.
I'd recommend rendering to an image at a higher DPI (say 4x) and then scaling-down that image using lanczos (just Google for a Java implementation). Then threshold that image to binary - an adaptive threshold might work well here.
-- John
> On 27 Jun 2016, at 09:10, Lachezar Dobrev <l....@gmail.com> wrote:
>
> 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).
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