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https://issues.apache.org/jira/browse/PDFBOX-4363?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16726580#comment-16726580
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simon steiner commented on PDFBOX-4363:
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Can this be done for TilingPaint also
> [Patch] Add a common interface PDShadingPaint for all shading paints
> --------------------------------------------------------------------
>
> Key: PDFBOX-4363
> URL: https://issues.apache.org/jira/browse/PDFBOX-4363
> Project: PDFBox
> Issue Type: Improvement
> Components: Rendering
> Affects Versions: 2.0.12
> Reporter: Emmeran Seehuber
> Assignee: Tilman Hausherr
> Priority: Minor
> Fix For: 2.0.13, 3.0.0 PDFBox
>
> Attachments: pdshadingpaint_base_interface.patch,
> shadingpaint_generic_baseclass.patch
>
>
> The attached patch adds an common interface PDShadingPaint to all
> PDShading-based Paint's. It allows to access the underlying PDShading object
> and the matrix of the paint.
> At the moment it is not possible to access this fields without using dirty
> accessibility hacks, see also [this
> commit|https://github.com/rototor/pdfbox-graphics2d/commit/8603f6f9c781604d4684b8cb46499703c34b4711].
> Why would you need that? I need that for my
> [PdfBoxGraphics2D|https://github.com/rototor/pdfbox-graphics2d] adapter. I
> draw PDF pages using PDFRenderer/PageDrawer back into a PDF. While doing so I
> derive from both classes and change / filter certain aspects of the PDF. One
> use case is to extract a specific seperation color into its own PDF page,
> remap it to another color and also draw some overfill (i.e. a additional
> border of 0.5pt around all shapes drawn with this color). This so prepared
> page is then used with a machine which glues foil (gold, silver or copper) on
> the places marked with that color.
> You can look at an [example
> here|https://github.com/rototor/pdfbox-graphics2d/blob/master/src/test/java/de/rototor/pdfbox/graphics2d/PdfRerenderTest.java],
> it does not use a seperation color, but you should get the idea.
> My long term goal is to be able to use PDFBox for all possible pre-press PDF
> manipulations. E.g. changing/remapping colorspaces, resampling images to the
> target resolution, ...
> At the moment I know of this "special cases" which will need a special
> treatment, as they are normally handled through rendering them first into a
> BufferedImage:
> - Transparency groups
> - Softmasks
> Are there other places which resort to rendering to a BufferedImage first?
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