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https://issues.apache.org/jira/browse/PDFBOX-5149?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17314275#comment-17314275
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Emmeran Seehuber commented on PDFBOX-5149:
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I use PDFRenderer with my PdfBoxGraphics2D to "rerender" the PDFs and change
certain aspects in the process. I.e. I do some kind of transformation on the
PDF by rendering it.
For a simple example look
[here|https://github.com/rototor/pdfbox-graphics2d/blob/master/graphics2d/src/test/java/de/rototor/pdfbox/graphics2d/PdfRerenderTest.java#L123].
Depending on what I want to do I want to preserve as much of the original PDF
as possible. So I also try to preserve the PDShadings (this is the code using
the clone utility). This works for most parts, only transparency groups get
"messed up", because they are rasterized as bitmaps by the PDFRenderer. I have
already thought about would could be done to avoid that, but did not yet find
time do some prototyping on this. I would like to be able to use PDFRenderer ->
PdfBoxGraphics2D to process a PDF without loosing anything (i.e. also
preserving all images in their full colorspace etc.). This could be used for
all different kind of things. E.g. optimizing image resolution for web
publishing or even implement a full PrePress PDF transformation (i.e. changing
all colorspaces to be the same target CMYK, reduce resolution of image if they
are way above what the print machine can do and so on).
At the moment I use this to convert some seperation color shapes into forms for
sleeve foils. I.e. if you have some printed wedding card with some gold foil on
it, the gold foil is applied by an extra step. In this step the shape which
should get gold is printed with a CMYK(1,1,1,1) color and then put through a
sleeve foil machine which will put foil where the toner is on the paper. After
this step the real content is printed on the card. I get one PDF which contains
the pages including the seperation color, and I have to preprocess it to get a
page with only the shape for the gold and a page with the "normal" colors of
the page, but without the special color.
So in the long term I would really like to be able to clone objects into new
documents. Maybe adding PDCloneableObject interface and let all stuff which can
really be safe cloned into a new document be implemented by it? Or just
renaming PDFCloneUtility into something like COSInternalCloner? So that nobody
finds it if he not really knows what he wants?
> 3.0.0-RC1: PDFCloneUtility is no longer accessible
> --------------------------------------------------
>
> Key: PDFBOX-5149
> URL: https://issues.apache.org/jira/browse/PDFBOX-5149
> Project: PDFBox
> Issue Type: Bug
> Affects Versions: 3.0.0 PDFBox
> Reporter: Emmeran Seehuber
> Priority: Major
>
> PDFCloneUtility is no longer accessible by default. This is low level
> functionality, which is sometimes required and useful. PDFBox itself is low
> level, so I don't see why you would restrict access to this. Also this API is
> not really complicated nor unstable.
> For now I did a dirty workaround to access it (see
> [here|https://github.com/rototor/pdfbox-graphics2d/commit/5986bc653f83b2c06e5218ac906b9a9bc75f724e#diff-2113e77a03390c0cf920587a642fe7693e5b3c8402de783223035a79e13c2209R1]).
> I would rather like to get rid of this workaround soon.
> Other than that, PDFBox-Graphics2d seems to work fine with PDFBox 3.0.0-RC1.
> I just released a 3.0.0-RC1 version of it.
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