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https://issues.apache.org/jira/browse/PDFBOX-6032?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18004422#comment-18004422
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Emmeran Seehuber commented on PDFBOX-6032:
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So if I get it correct, your source bytes are a PNG, but it is not possible to
convert this into a PDImage, as it uses some encoding not supported by the
PNGConverter? And the issue is, that it than falls back to the normal lossless
PNG encoder which is of course not the fastest in the world, as it uses ZIP
compression etc.
In this case I would personally prefer to just make an overloaded
createFromByteArray() method which takes a FileType for the fallback encoding.
And let the one without the FileType argument just pass FileType.PNG as the
fallback encoding.
But maybe we should not use the FileType enum here, but instead something like
a new enum EncodingType (Lossless, JPEG).
> Issues encountered while customizing "PDImageXObject"
> ------------------------------------------------------
>
> Key: PDFBOX-6032
> URL: https://issues.apache.org/jira/browse/PDFBOX-6032
> Project: PDFBox
> Issue Type: Wish
> Components: PDModel
> Affects Versions: 3.0.5 PDFBox
> Reporter: Ilgoo Kim
> Priority: Major
>
> In my team, we are using PDFBox to add an PDF-export feature to our editor
> service.
> Unfortunately the performance does not meet our expectations, especially
> when LosslessFactory is invoked within the "createFromByteArray" function of
> PDImageXObject.
> Therefore we customized the "createFromByteArray" function to favor
> JPEGFactory over LosslessFactory in order to improve performance, even at the
> cost of some image quality loss. (based on the criteria through a
> pixel-by-pixel alpha check)
> However, bringing the "createFromByteArray" function into our project
> introduces a problem: since "PNGConverter" is not public, we are forced to
> copy the entire "PNGConverter" class into our codebase as well.
> I was wondering if it would be possible to make the "PNGConverter" class
> public, or alternatively, if there is a recommended way to better customize
> the "createFromByteArray" function.
> Thank you.
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