Hi,
I was able to reduce it further:
https://drive.google.com/file/d/1la-XYjKpDKar8sb9lUI1FTuxNutq682W/view?usp=sharing
The effect with PDFDebugger still happens. Nothing at 100%, line at 150%.
The content stream is now this:
1 0 0 1 7.812 413.676 cm
0 0 m
-0.354 -0.354 l
56.693 -0.354 l
56.693 0 l
55.913 0.354 l
0.354 0.354 l
h
W
n
1 0 0 1 -0.354 0 cm
0.708 w
0 0 m
57.047 0 l
S
From what I see, there is a clipping with width 0.708 and a line with
the same width, but at 100% it isn't shown.
The next thing to do would be to check whether these numbers are passed
1:1 to PageDrawer or if the numbers change.
If they don't change, then it means that Java doesn't display this
because the line (and the clipping "rectangle") is smaller than 1 pixel.
Tilman
On 01.11.2023 18:44, Tres Finocchiaro wrote:
It's mostly in PageDrawer.java search for things line width and clip.
I attempted to make some modifications to PageDrawer, but couldn't figure
out any changed that improved the behavior.
Also convert the PDF to uncompressed and try to change the page content
stream so that only the lines remain, i.e. try to get a "reduced" PDF that
still produces the effect.
The original PDF was encrypted, so this was impossible, but Pitney Bowes
was kind enough to send over an unencrypted PDF. Since I do not know the
PDF format very well, I'm a bit unsure how to make sure it's uncompressed.
Using Acrobat Pro, I was able to remove many of the components of the PDF
while still reproducing the issue. If I remove too many of them, Acrobat
turns the PDF into an image, so this "reduced" PDF still has many items
which can be removed to narrow this down.
https://github.com/qzind/tray/files/13229981/pitney_bowes_simplified.pdf
This new PDF is interesting because a similar issue with vanishing lines
occurs on the box around the C005 text, which makes me believe the issue
will be even easier to narrow down.
Another detail that I find interesting is how these lines render in Adobe
Acrobat. For example, when I stretch the line to be larger, it looks very
odd. I've taken a screenshot from Acrobat to illustrate this:
https://user-images.githubusercontent.com/6345473/279754645-d406b70f-5ff1-430f-88ba-868efdf79973.png
... Furthermore, resizing of this line nearly deadlocks Acrobat on my
computer. I'm not a regular user of Acrobat, so this may be irrelevant,
but it seemed odd that a trivial resize operation on a document with a
single line would be so taxing.
Is the PDF now in a better format for debugging? If not, what can be done
to help narrow down this cause?
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