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https://issues.apache.org/jira/browse/PDFBOX-5231?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17373199#comment-17373199
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Tilman Hausherr commented on PDFBOX-5231:
-----------------------------------------
I do not have these errors (I used PDFDebugger). Try running this without
multithreading.
> Text part of picture converted from pdf to jpg by pdfBox2.0.23 looks very
> unclear.
> ----------------------------------------------------------------------------------
>
> Key: PDFBOX-5231
> URL: https://issues.apache.org/jira/browse/PDFBOX-5231
> Project: PDFBox
> Issue Type: Bug
> Affects Versions: 2.0.23
> Environment: Linux kp-kylin-04 4.19.90-17.5.ky10.aarch64 #1 SMP Fri
> Aug 7 13:35:33 CST 2020 aarch64 GNU/Linux
> Java(TM) SE Runtime Environment (build 1.8.0_251-b08)
> Reporter: LuoWeiWei
> Priority: Blocker
> Attachments: private.png
>
>
> *Text part in converted jpg looks particularly unclear like attached picture.*
> *The pdf url: (ps. I can't upload the pdf to the attachments)*
> http://nos.netease.com/nts-bucket-output/chongwudian.pdf
> **
> *When I use the same jar to convert in my local environment and other server,
> it turns to be clear .*
> *So I doubt it may be caused by system environment, and it's system info:*
> _Linux kp-kylin-04 4.19.90-17.5.ky10.aarch64 #1 SMP Fri Aug 7 13:35:33 CST
> 2020 aarch64 GNU/Linux_
> Java(TM) SE Runtime Environment (build 1.8.0_251-b08)
> *And there are some warning message:*
> _July 01, 2021 6:11:46 AM org.apache.pdfbox.pdmodel.font.PDType0Font
> toUnicode_
> _Warning: No Unicode mapping for CID+3108 (3108) in font
> SPIATY+FZLTHJW--GB1-0_
> _July_ _01, 2021 6:11:46_ _AM_ _org.apache.pdfbox.pdmodel.font.PDType0Font
> toUnicode_
> _Warning__: No Unicode mapping for CID+3108 (3108) in font
> SPIATY+FZLTHJW--GB1-0_
> _July_ _01, 2021 6:11:46_ _AM_ _org.apache.pdfbox.pdmodel.font.PDType0Font
> toUnicode_
> _Warning__: No Unicode mapping for CID+3108 (3108) in font
> SPIATY+FZLTHJW--GB1-0_
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