slice op• Data kinds: rgbvolume → rgbimage
• Call: import fullseye as fs; fs.ledger.vol_label_slice_rgb(rgbvol, index: 'int', axis='z') (to call the implementation directly, import volcolor; volcolor.vol_label_slice_rgb(rgbvol, index: 'int', axis='z'); from the registry, opsvolcolor.get("vol_label_slice_rgb"))
Take one RGB cross-section out of a coloured volume (axial / coronal / sagittal).
*axis* is "z"/"axial"/0 (returns (H, W, 3)), "y"/"coronal"/1 ((D, W, 3)), "x"/"sagittal"/2 ((D, H, 3)). The 2 returned axes differ per axis -- natural, since 1 axis is removed from (D, H, W), but a caller expecting (H, W) gets a picture with rows and columns swapped, without an exception. The 3 shapes are pinned by tests/test_volcolor.py::test_slice_axes_shapes_and_content.
*index* must be non-negative. Silently accepting -1 as "the last slice" would let an out-of-range request pass as the last slice (a figure whose cut position is off by 1 does not look "broken" to either a machine or an eye).
Returns a contiguous float64 (..., 3) copy. Raises ValueError for a bad volume, an unknown *axis*, or an out-of-range / negative *index*.
• Sample-data catalog (download URLs / licences) — 2-D uses skimage.data (BSD/public domain) plus synthetic images; 3-D lists download URLs for real data sources (Stanford, PDS, …).
• Operator provenance and references — the sources of the research/methods this op family came from.
• The canonical algorithm (author, year) and its uses are named in the family usage guide above.
• voxel_labels_color — py -3.11 examples/voxel_labels_color.py
rgbimage as input)—
slice)*Provenance: volcolor.py — VOLCOLOR operator registry. This per-op note is generated by tools/opdocs.py md (do not hand-edit).*
© 2026 Kazufumi Furuse — Fullseye operator documentation. Licensed under Apache-2.0.