docs: add datashader reductions example - #21
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New examples/datashader_reductions.ipynb explaining how the datashader backend aggregates a continuous colour when primitives share a pixel, on the real Xenium cells dataset (squidpy): - why a reduction is needed (default max) - datashader_reduction: max vs mean vs sum (colorbar scale differs), plus count and std - method='datashader' for large images (morphology_focus) - the datashader contrast caveat (aggregate range, not norm percentiles) Executed against spatialdata-plot v0.4.1; committed with outputs. Adds the examples gallery card + toctree + thumbnail. Closes P0.4 of the doc-coverage analysis.
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Summary
Adds
examples/datashader_reductions.ipynbdocumentingdatashader_reduction=— how the datashader backend combines a continuous colour when primitives share a pixel. Real Xeniumcells(squidpy.datasets.cells()).Covers:
max)datashader_reduction:maxvsmeanvssum(the colorbar scale differs), pluscountandstdmethod="datashader"for large images (morphology_focus)Extends the datashader story from the performance tutorial (which only shows the backend on/off toggle). Executed against spatialdata-plot v0.4.1, committed with outputs. Adds the examples gallery card + toctree + thumbnail.
Part of the documentation-expansion series from the 0.4.0/0.4.1 gap analysis (P0.4).