Hi,
The annotation contains an appearance that is either provided or
generated by PDFBox; in your file, it is provided. This is an ordinary
PDF structure with a content stream etc. It uses a "multiply" blendmode.
In PageDrawer.fillPath() it happens in
graphics.setComposite(graphicsState.getNonStrokingJavaComposite());
This is a blendcomposite that is created by
BlendComposite.getInstance(blendMode, (float) nonStrokingAlphaConstant);
more can be seen in BlendComposite.java and BlendMode.java.
I suspect that you'll have troubles with other PDFs that uses blend
modes, e.g. the ones in
https://issues.apache.org/jira/browse/PDFBOX-4095
https://issues.apache.org/jira/browse/PDFBOX-3000
Tilman
On 13.02.2025 20:15, Rich Stafford wrote:
PDFBox users:
I have a simple PDF that contains some text, and an 'annotation' highlight
covering the text. Using PDFBox 3.0.2, when I render it to a raster format,
the 'annotation' is transparent and the text behind it shows up.
However, when I render it to SVG (using batik svggen.SVGGraphics2D), the
highlight is opaque.
I've put the sample PDF and the generated SVG in a public folder as follows:
PDF: s3://webdl.equorum.com/misc/I20250156.pdf
SVG original: s3://webdl.equorum.com/misc/I20250156.svg
SVG opacity: s3://webdl.equorum.com/misc/I20250156-opacity.svg
The highlight is rendered as a 'g' object in the SVG near the end of the file,
with a 'fill:rgb(255,255,49)'. If I add a 'opacity:0.4;' attribute to that
object, then the contained text appears properly. The I20250156-opacity.svg has
been modified to add the opacity attribute.
I guess what I need to find is what rendering call from PDFBox is being made to
render the 'annotation' highlight. I've already sub-classed the SVGGraphics2D
class to handle some other image related issues, so hopefully I can find the
corresponding calls to handle this as well?
Thanks for your assistance,
Rich Stafford
Chief Scientist
eQuorum Corporation
---------------------------------------------------------------------
To unsubscribe, e-mail: users-unsubscr...@pdfbox.apache.org
For additional commands, e-mail: users-h...@pdfbox.apache.org
