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https://issues.apache.org/jira/browse/PDFBOX-3101?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15002648#comment-15002648
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John Hewson commented on PDFBOX-3101:
-------------------------------------
These characters are embedded as bitmaps which is why the quality is low, even
in Acrobat. However, the quality is particularly poor in PDFBox. That's because
Java2D doesn't scale images particularly well and theses images are being
scaled down by a factor of eight.
The good news is that you can work around this by rendering the page image at a
higher scale than you need, e.g. 4x and then scaling-down the resulting image
by 4x using a [high-quality image scaling
algorithm|https://github.com/mortennobel/java-image-scaling].
> Chinese character displayed with bad quality
> --------------------------------------------
>
> Key: PDFBOX-3101
> URL: https://issues.apache.org/jira/browse/PDFBOX-3101
> Project: PDFBox
> Issue Type: Bug
> Components: Rendering
> Affects Versions: 2.0.0
> Environment: ubuntu 12.04 NetBeans IDE 8.0.2
> Reporter: ZHOU Jing
> Attachments: 1.png, ConvertPDFToImages.java, ZH_PDF.pdf
>
>
> When I use PDFRender to render the following PDF file to PNG image, the
> Chinese Character is displayed in poor quality with dashed lines.
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