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https://issues.apache.org/jira/browse/PDFBOX-4516?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17092171#comment-17092171
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Tilman Hausherr commented on PDFBOX-4516:
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Differences look good. Other files that look much better:
- PDFJS-8741-p1-patternscaling.pdf
- pop-bugzilla64892-p3-slow.pdf
- PDFJS-2922-p5.pdf
Overall performance goes down 16%. Performance of files with scanned papers
will be worst. The first page of PDFBOX-2158-077702.pdf takes 3x as long with
the smooth scaling than before.
> PDFBox text and images are blurry even after rendering with high DPI
> --------------------------------------------------------------------
>
> Key: PDFBOX-4516
> URL: https://issues.apache.org/jira/browse/PDFBOX-4516
> Project: PDFBox
> Issue Type: Bug
> Components: Rendering
> Affects Versions: 2.0.15, 2.0.19
> Environment: Oracle Java 8 update125 on both Mac OS X and centos
> Reporter: Jack
> Priority: Major
> Labels: interpolation, quality
> Attachments: PDFBOX-4516-59.png, PDFBOX-4516-better-72dpi.jpg,
> PDFBOX-4516-output-default.png, PDFBOX-4516-output-improved.png,
> PDFBOX-4516_TvT-better-72dpi.jpg, PDFBOX-4516_TvT.pdf,
> PDFBOX-4815-dithered-stencil-bad-36dpi.jpg,
> PDFBOX-4815-dithered-stencil-bad-72dpi.jpg,
> PDFBOX-4815-dithered-stencil-better-36dpi.jpg,
> PDFBOX-4815-dithered-stencil-better-72dpi.jpg,
> PDFBOX-4815-dithered-stencil.pdf, PDFBox4516.java,
> Screenshot-PDFBOX-1359.pdf-page17.png, defaultDPI.png, highDPI.png,
> lowDPI.png, original.pdf
>
>
> I tried to render image with different DPI, found PDFBOX performs poorly on
> the input pdf file, I have to put a very high DPI to get a reasonable good
> image. Could anyone pls help take a look? Thanks
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