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https://issues.apache.org/jira/browse/PDFBOX-5314?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tilman Hausherr resolved PDFBOX-5314.
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Assignee: Tilman Hausherr
Resolution: Fixed
> Additional `showTransparencyGroupOnGraphics()` method
> -----------------------------------------------------
>
> Key: PDFBOX-5314
> URL: https://issues.apache.org/jira/browse/PDFBOX-5314
> Project: PDFBox
> Issue Type: New Feature
> Components: Rendering
> Affects Versions: 2.0.24
> Reporter: Henry Iguaro
> Assignee: Tilman Hausherr
> Priority: Minor
> Fix For: 2.0.25, 3.0.0 PDFBox
>
> Attachments: image-2021-11-05-14-36-13-097.png
>
>
> Hey team,
> In one particular feature of our product, we read PDF files (using PDFBox, of
> course) and extract graphical elements as individual images for our
> customers. However, when TGs are decoded, we end up with partial results. For
> example, given the following
> [file|https://github.com/apache/pdfbox/files/7457707/testing.pdf]:
> !https://user-images.githubusercontent.com/2560573/139784518-b3f8965c-79a2-45d6-8200-62fa0e3c4459.png!
> Ideally, our flow should extract its graphical content as an individual image:
> !https://user-images.githubusercontent.com/2560573/139784739-d7562053-0f11-4752-be7f-2ba6659d4816.png!
> But after the TGs is decoded, the results we obtain with our current
> implementation are the following 3 separate images:
> !image-2021-11-05-14-36-13-097.png!
> We found out that if we manage to pass a particular {{Graphics2D}} instance
> to {{showTransparencyGroup()}} we can redirect the rendering of the TG to a
> separate image and achieve our feature.
> We created a PR as a potential proposal for a new protected
> {{showTransparencyGroupOnGraphics()}} method that would extend the current
> {{showTransparencyGroup()}} by taking an additional {{Graphics2D}} argument.
> The link to the PR is here:
> https://github.com/apache/pdfbox/pull/134
> The above is just a suggestion but keen to hear your thoughts, and of course,
> open to better ideas.
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