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https://issues.apache.org/jira/browse/PDFBOX-4657?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16935344#comment-16935344
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ASF subversion and git services commented on PDFBOX-4657:
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Commit 1867347 from Tilman Hausherr in branch 'pdfbox/branches/2.0'
[ https://svn.apache.org/r1867347 ]

PDFBOX-4657: don't disable interpolation for downscaled stencils to avoid them 
becoming white or black

> Use smooth interpolation for stencils too
> -----------------------------------------
>
>                 Key: PDFBOX-4657
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-4657
>             Project: PDFBox
>          Issue Type: Improvement
>          Components: Rendering
>    Affects Versions: 2.0.17
>            Reporter: Tilman Hausherr
>            Assignee: Tilman Hausherr
>            Priority: Major
>              Labels: interpolation, pattern
>             Fix For: 2.0.18, 3.0.0 PDFBox
>
>
> This came up with the PDF in PDFBOX-4627... the pattern was invisible. This 
> is because interpolation is currently disabled for all stencils. This 
> invisibility problem is solved by using the rendering hints when a stencil is 
> downscaled. Currently we don't, due to a past problem with the file 
> survey.pdf (PDFBOX-1094). However this problem no longer occurs, likely due 
> to other changes in the last 5 years.



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