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https://issues.apache.org/jira/browse/PDFBOX-1989?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13938596#comment-13938596
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John Hewson commented on PDFBOX-1989:
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+1
> Save LZW and other encoded PDImageXObject resources
> ---------------------------------------------------
>
> Key: PDFBOX-1989
> URL: https://issues.apache.org/jira/browse/PDFBOX-1989
> Project: PDFBox
> Issue Type: Improvement
> Components: PDModel
> Affects Versions: 2.0.0
> Reporter: Tilman Hausherr
> Assignee: Tilman Hausherr
> Priority: Minor
> Fix For: 2.0.0
>
>
> The "logo" image of the file from PDFBOX-1147.png isn't extracted because
> PDImageXObject.getSuffix() returns null. Changing getSuffix() so that it
> returns png brings us a correct file.
> With some other images, e.g. the raw_image_demo.pdf file, getSuffix() brings
> an NPE when getPDStream().getFilters() returns null. This happens with images
> that are uncompressed. Returning "png" for this case also brings us a nice
> image.
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