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https://issues.apache.org/jira/browse/PDFBOX-1990?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13939325#comment-13939325
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Tilman Hausherr commented on PDFBOX-1990:
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NullOutputStream optimized for speed in rev 1578940.
> Support creating PDF from lossless encoded images
> -------------------------------------------------
>
> Key: PDFBOX-1990
> URL: https://issues.apache.org/jira/browse/PDFBOX-1990
> Project: PDFBox
> Issue Type: Improvement
> Reporter: Tilman Hausherr
> Priority: Minor
>
> Currently we support the insertion of TIFF and JPEG into a PDF, but not PNG.
> We can pass a BufferedImage, but this one will be JPEG compressed which is
> not a good thing for graphics with sharp edges. I suggest that we support PNG
> as well. It is possible because the Flate Filter supports both directions.
> My implementation (coming in a few minutes) is just an RGB based start that
> begs for improvement.
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