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https://issues.apache.org/jira/browse/PDFBOX-5091?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17277172#comment-17277172
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Volker Ullmann commented on PDFBOX-5091:
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The docs say, the _image downscaling optimization threshold_ will only be taken
into account if the rendering hints _bicubic_ and _quality_ are set.
As mentioned above we don't set any rendering hints, so I suppose defaults will
be used and the threshold value is ignored.
Furthermore I did some test runs playing with rendering settings (speed versus
quality) and the only remarkable difference is the quality of the resulting
image. In fact the average processing time is nearly the same for _quality_
(bicubic interpolation, antialiased rendering, highest render quality) as for
_speed_ (Nearest Neighbor interpolation, nonantialiased rendering, fastest
rendering methods).
Seems that the rendering hints and image downscaling optimization threshold
won't help me.
Do you have any other ideas?
> Performance issue when saving PDF to image after upgrading from PDFBox 2.0.20
> to 2.0.21
> ---------------------------------------------------------------------------------------
>
> Key: PDFBOX-5091
> URL: https://issues.apache.org/jira/browse/PDFBOX-5091
> Project: PDFBox
> Issue Type: Bug
> Environment: JDK 8 on Windows10
> Reporter: Volker Ullmann
> Priority: Minor
> Attachments: single_page.pdf
>
>
> We use PDFBox to save the first page of a PDF as an image to provide a
> preview of the document. These PDFs can be relatively complex as they may
> contain ten thousands of objects, especially map data. The results are still
> fine, but when we upgraded from 2.0.20 to 2.0.21 we had a notable performance
> decrease. Saving the first page of the attached sample document now takes
> nearly 20 sec on my developer machine, compared to 4 sec with 2.0.20.
>
>
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