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https://issues.apache.org/jira/browse/PDFBOX-2364?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14145130#comment-14145130
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John Hewson commented on PDFBOX-2364:
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Ok, I've figured it out, the behaviour of the "Interpolate" flag isn't strictly
specified and is left to the "conforming reader" to choose. Page 2 of
mori-cvpr01.pdf from PDFBOX-2302 shows that Acrobat uses nearest-neighbour when
scaling up small images on the page. However, the file from PDFBOX-2338 which
this issue is about, renders smoothly in Acrobat. The difference is that the
second PDF has images which are being scaled _down_.
It seems that Acrobat honours the Interpolate flag when scaling up, but not
scaling down, which makes some sense.
> CCITT image renders incorrectly
> -------------------------------
>
> Key: PDFBOX-2364
> URL: https://issues.apache.org/jira/browse/PDFBOX-2364
> Project: PDFBox
> Issue Type: Bug
> Components: Rendering
> Affects Versions: 2.0.0
> Reporter: John Hewson
> Labels: CCITTFaxDecode, ccitt
> Attachments: PDFBOX-2338-2038866.jpg, PDFBOX-2338-p6.jpg
>
>
> The file from PDFBOX-2338 has a CCITT image on p6 which renders incorrectly.
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