Hi,
This is weird, RenderingHints.VALUE_RENDER_QUALITY is in the default
settings?! See in the source code,
PDFRenderer.createDefaultRenderingHints().
antialiasing is off when bitonal destination.
Tilman
Am 05.04.2019 um 17:48 schrieb STAMPF Lukas:
Thanks, seems like it wasn't the antialiasing. Turning it off and on didn't
change the results between 2.0.13 and 2.0.14. What did help however was
hints.put(RenderingHints.KEY_RENDERING,
RenderingHints.VALUE_RENDER_QUALITY);
Setting this on 2.0.14 seems to restore the 2.0.13 behavior. Could be
coincidence though. Need to verify it with a larger amount of documents first.
Has something about this setting changed between versions when rendering in
BINARY mode?
Lukas
-----Ursprüngliche Nachricht-----
Von: Tilman Hausherr <[email protected]>
Gesendet: Freitag, 5. April 2019 17:00
An: [email protected]
Betreff: Re: QR Image Detection Down 2.0.13 -> 2.0.14
Yes, PDFRenderer now allows to pass rendering hints.
Tilman
Am 05.04.2019 um 16:42 schrieb STAMPF Lukas:
Hi,
I am using PDFBox to generate BufferedImages which I feed to ZXing 3.3.3 to
do QR scanning. When I updated from 2.0.13 to 2.0.14 I noticed a severe
reduction in scanning reliability. I guess its related to this change
https://issues.apache.org/jira/browse/PDFBOX-4391
This is the render command I use:
bim = pdfRenderer.renderImageWithDPI(pageCounter, dpi,
ImageType.BINARY);
I try multiple dpi settings between 150 and 300, to increase my changes to find
a QR code.
Is there some flag I can set to test out if the antialiasing causes this?
Kind regards
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