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https://issues.apache.org/jira/browse/PDFBOX-4516?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17087002#comment-17087002
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Tilman Hausherr commented on PDFBOX-4516:
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Testing the workaround is a pain, because almost every rendering is different.
The reduce the differences I decided to do the workaround only if a scaling is
smaller than 0.2, but I just found out the TvT file was still poorly rendered.
Changing the threshold to 0.25 helps.
> 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, 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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