Daniel Persson created PDFBOX-4306:
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Summary: Image clipping area rounding error
Key: PDFBOX-4306
URL: https://issues.apache.org/jira/browse/PDFBOX-4306
Project: PDFBox
Issue Type: Bug
Reporter: Daniel Persson
Attachments: page-1.pdf, page-2.pdf, patch.diff, test.jpg
Creating images with PDFBox and merging them together when you have two pages
that connect will create a white line between the images.
We have looked into the issue and tried to fix it and found that the clipping
area is a bit to tight so the images will not be rendered correctly. My guess
is that this is due to a rounding error when using floats.
Most of the graphics functions in java use double precision and PDFBox uses
floats so when using layer upon layer of bounding boxes intersecting the
clipping area it might get skewed to a bad bounding box.
I've added a patch to this issue with the code we use as a workaround today.
It's by no means the final solution to the problem but it resolves the white
line issue.
To be sure that you get the error when generating the images use the following
command
```
java -jar pdfbox-app-3.0.0-SNAPSHOT.jar PDFToImage -dpi 150 -quality 0.95
-format jpg page-1.pdf
```
We run java 8 on our machines.
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