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https://issues.apache.org/jira/browse/PDFBOX-4657?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16935346#comment-16935346
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Tilman Hausherr commented on PDFBOX-4657:
-----------------------------------------

* PDFJS-2922-p5.pdf: patterned backgrounds nicer
 * PDFBOX-2187-002145.pdf, page 3: both patterns nicer
 * PDFBOX-2188.pdf, page 3: both patterns now correct. These have been wrong 
for years, always fully black or fully white.
 * gs-bugzilla695910.pdf: pattern nicer
 * PDFBOX-4194-slowprint.pdf: pattern nicer
 * PDFJS-8860-Pattern-Size1.pdf: white patterned background now visible
 * survey.pdf: scrollbar pattern nicer

> 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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