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https://issues.apache.org/jira/browse/PDFBOX-4300?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16593469#comment-16593469
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Jesse Long commented on PDFBOX-4300:
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PDFBOX-4300-1.patch is just for the createFromGrayImage() method. I intend to
implement the same idea for createFromRGBImage() and PredictorEncoder but don't
have the time right now. Hey, it's something :)
> Reduce im memory buffers when creating grayscale images
> -------------------------------------------------------
>
> Key: PDFBOX-4300
> URL: https://issues.apache.org/jira/browse/PDFBOX-4300
> Project: PDFBox
> Issue Type: Improvement
> Components: PDModel
> Affects Versions: 2.0.11
> Reporter: Jesse Long
> Priority: Minor
> Attachments: PDFBOX-4300-1.patch
>
>
> LosslessFactory uses ByteArrayOutputStreams when creating PDF image data.
> First, it creates a BAOS in which to store the data, then a BAOS in which to
> store the flate encoded data. Finally the flate encoded data is written to
> the PDImageXObject's stream.
> We could instead create an empty PDStream, give it a filter, and write the
> image data directly into the stream. We then instantiate a PDImageXObject
> giving it the already created stream.
> This would dramatically reduce RAM requirement if a scratchfile is in play.
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