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https://issues.apache.org/jira/browse/PDFBOX-1094?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14107328#comment-14107328
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John Hewson commented on PDFBOX-1094:
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Yes, the device's DPI also needs to be taken into account. In the PDF model the
parent stream's initial transform should already include any device transform.
However, PDFBox doesn't do this, instead it applies the device transform to the
Graphics2D before rendering (see PDFRenderer, line 200, and note my TODO
comment below). So technically, we only need to take into account the parent
stream's initial matrix, as in my previous comment, but in the current
implementation of PDFBox we'd also need to scale that using the device matrix
to account for DPI, as you say.
Valid fixes for this are to either:
1. Stop using Graphics2D#scale for device scaling in PDFRenderer, instead set
the initial stream matrix in PDFStreamEngine. Then pass the initial stream
matrix to the tiling pattern (this is the solution I proposed some time ago).
2. Have PageDrawer extract the initial scale from Graphics2D#getTransform and
pass it to the tiling pattern in addition. This fixes the DPI problem but not
the fact that TilingPaint will be drawn to the Graphics2D using the CTM instead
of the stream's initial matrix, so that aspect will still be wrong.
> Pattern colorspace support
> --------------------------
>
> Key: PDFBOX-1094
> URL: https://issues.apache.org/jira/browse/PDFBOX-1094
> Project: PDFBox
> Issue Type: Improvement
> Components: Rendering
> Affects Versions: 1.6.0
> Reporter: Andreas Lehmkühler
> Assignee: Andreas Lehmkühler
> Priority: Minor
> Attachments: ColoredTilingPaint.patch, PATTYP1.pdf, PATTYP2.pdf,
> PDF32000_2008_pg737.pdf, PDFBOX-1094-065514-XStep32767.pdf,
> PDFBOX-1094-094730.pdf, PDFBOX-1094-096213-p18.pdf, PDFStreamEngine.patch,
> PageDrawer.patch, _pdfbox-1094-tiling_pattern.pdf-1-blurry.png,
> jagpdf_doc_patterns.pdf, jagpdf_doc_patterns.pdf-1.png,
> pdfbox-1094-pdf32000_2008_pg737.pdf-1.png,
> pdfbox-1094-pdf32000_2008_pg737.pdf-1.png,
> pdfbox-1094-tiling_pattern.pdf-1.png, pdfbox-1094-tiling_pattern.pdf-1.png,
> pdfbox-1094-tiling_pattern.pdf-1.png, pdfbox-1861-tracemonkey.pdf-13.png,
> pdfbox-1861-tracemonkey.pdf-13.png, tiling_pattern.pdf
>
>
> PDFBox doesn't support PDPattern colorspaces
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