tikz: a `transparency group=knockout` example

DominikPeters / tikz.dev-issues

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tikz: a `transparency group=knockout` example #42

Open muzimuzhi opened 2 months ago

muzimuzhi commented 2 months ago

Describe the bug

The last /tikz/transparency group example for knockout looks different from that in pgfmanual. The node content is lost, just like how the corresponding PDF is rendered by TeXstudio's poppler-based PDF reader.

Founding when replying to https://github.com/pgf-tikz/pgf/issues/1315.

Screenshots

HTML https://tikz.dev/tikz-transparency#pgf./tikz/transparency:group
PDF pgfmanual (v3.1.10), page 364

Device / OS / Browser

Seems irrelevant.

DominikPeters commented 2 months ago

Not surprising since that PNG file is made by poppler. Unfortunately ImageMagick also does not render it correctly, so the trick that worked for the various pgfplots examples in February (e.g. https://github.com/DominikPeters/tikz.dev-issues/issues/29) does not work here.