illusion_checker_shadow — GENERATIVE illusion op

• Data kinds: none → rgb (an op determined by its arguments alone — it takes no image or data input)

• Call: import fullseye as fs; fs.ledger.illusion_checker_shadow(size: 'int' = 46, n: 'int' = 8, light: 'float' = 0.62, dark: 'float' = 0.31) -> 'np.ndarray' (to call the implementation directly, import illusion; illusion.illusion_checker_shadow(size: 'int' = 46, n: 'int' = 8, light: 'float' = 0.62, dark: 'float' = 0.31) -> 'np.ndarray'; from the registry, opsgenerative.get("illusion_checker_shadow"))

Usage

> This operator's description has not been translated yet. The original text follows as it is.

チェッカーシャドウ。印を付けた 2 マスは厳密に同じ画素値。

影の係数を `dark / light` に取ると、影の中の明マスは影の外の暗マスと

数として同じになる。★この図は `aa=0`(反エイリアスなし)で描く ——

縁の混色が入ると「厳密に同値」という主張のほうが嘘になるため。

不変量: :data:CHECKER_PATCHES の 2 マス —— 影の外の暗マス (2,3) と

影の中の明マス (5,5) —— の画素値が完全に一致(差が厳密に 0)。

★ここは一度間違えた。対にすべきは「暗マス × 影なし」と「明マス × 影あり」で、

同じ明暗のマスを 2 つ選んでも当然ながら一致しない(実測 0.31 の差が出た)。

絵は「それらしく」見えてしまうので、数で確かめるまで気づけない ——

この族が守ろうとしているのと同じ型の事故。

Detailed usage guide

• generative_art family guide

References (sample data, literature)

• 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.

Runnable examples (verified samples that actually call this op)

• (none yet)

Ops the type connects to (they accept rgb as input)

—

Same category (illusion)

illusion_cafe_wall · illusion_muller_lyer · illusion_ponzo · illusion_zollner · illusion_poggendorff · illusion_fraser_spiral · illusion_ebbinghaus · illusion_kanizsa


*Provenance: illusion.py — GENERATIVE 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.