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https://issues.apache.org/jira/browse/PDFBOX-5224?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tilman Hausherr resolved PDFBOX-5224.
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Resolution: Fixed
> Optimize SampledImageReader.from1Bit()
> --------------------------------------
>
> Key: PDFBOX-5224
> URL: https://issues.apache.org/jira/browse/PDFBOX-5224
> Project: PDFBox
> Issue Type: Improvement
> Components: Rendering
> Affects Versions: 2.0.24
> Reporter: Tilman Hausherr
> Assignee: Tilman Hausherr
> Priority: Major
> Fix For: 2.0.25, 3.0.0 PDFBox
>
> Attachments: Alfa-p1.pdf
>
>
> From Gunnar Brand:
> {quote}This fixes an issue with a missed logged error + loop breaking if an
> erroneous read falls onto a skipped row.
> It also improves the speed at least by factor twice (due to sign test instead
> of bit masking and boolean flag for subsampling).
> It will be even faster with regions, as there was a poor design choice of
> full inner loop computations even if x was below startX.
> {quote}
> Attached: page 1 of https://archive.org/details/AlfaWaffenkatalog1911
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