Hi,
Yes shading can be very slow, especially at high dpi. The attachment
didn't get through, please upload to a sharehoster or create a ticket.
If you need to register then add a meaningful text, e.g. the subject of
this post so we know you're not a spammer. Also retry with 2.0.31 and
3.0.2 just to be sure. However I'm pessimistic that this can be fixed.
Tilman
On 19.07.2024 19:56, Larry Lynn wrote:
Hello PDFBox users and maintainers,
We have a PDF that causes performance problems when we use PDFBox to
convert it to an image with renderImageWithDPI(). We're calling
renderImageWithDPI() with 650 DPI. I realize this is a very high
value - we're using it for high fidelity original images that will
later be downsampled. On my work laptop which has fairly strong
hardware, the conversion takes 25 minutes and consumes 20GB of
memory. CPU and memory usage is reduced if we use a lower DPI.
The PDF is 1 page long. It contains type 4 shading / Gouraud free
form triangle meshes. We've been aware of some performance issues
with type 4 shading for a little while now, but the PDFs that
contained the type 4 shading belonged to our customers and we were not
authorized to share them. We finally found a problem input document
that is non-sensitive and that we are authorized to share. I've
attached a copy of the problem PDF to this email.
I searched the archives for the users and the developers mailing list
and I didn't find anything specifically about this issue.
I searched through the PDFBox jira tickets and I found a couple of
tickets that looked similar: PDFBOX-2901 & PDFBOX-4491. PDFBOX-2901
seems to most closely describe what we're seeing, but that was closed
in PDFBox 2.0.0, and our issue still reproduces with PDFBox 2.0.28.
Should I refer this issue over to the developers mailing list or
create a PDFBox Jira ticket for this?
Thanks and Regards,
Larry Lynn
--
*Larry Lynn*
**Staff *Software Engineer*
*Workiva Inc*.
*448 E. Main St, Bozeman, MT, 59715
*
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