fullseye

vignette — GFX2D post op

• データ種: rgb → rgb
• 呼び出し: import fullseye as fs; fs.ledger.vignette(rgb, strength=0.6, radius=1.0, power=2.0) (実装を直接呼ぶなら import gfx2d; gfx2d.vignette(rgb, strength=0.6, radius=1.0, power=2.0)、台帳から引くなら opsgfx2d.get("vignette"))

使い方

Darken towards the corners: out = rgb * (1 - strength * t**power).

t is the distance from the geometric centre ((h-1)/2, (w-1)/2) divided by radius times the half-diagonal, clipped at 1. The factor at t = 0 is exactly 1, so strength=0 is the exact identity and — for an odd-sized image, where a pixel actually sits on the centre — that pixel is returned untouched. An even-sized image has no centre pixel: its four innermost pixels are 0.707 px out and are already attenuated, which is geometry rather than a rounding error.

参考(サンプルデータ・文献)

• サンプルデータ カタログ(DL URL / ライセンス) — 2-D は skimage.data(BSD/public)+ 合成、3-D は実データ源(Stanford/PDS 等)の DL URL。
• 演算子の来歴・参考文献 — この op 族の元になった研究/手法の出典。
• アルゴリズムの正典(著者・年)と用途は上記ファミリ使い方ガイドに記載。

実行できる例(この op を実際に呼ぶ検証済みサンプル)

• gfx2d_scene — py -3.11 examples/gfx2d_scene.py
• poc_search_sweep_width — py -3.11 examples/poc_search_sweep_width.py
• poc_solar_el_inspection — py -3.11 examples/poc_solar_el_inspection.py

型が繋がる次の op(rgb を入力に取れる)

srgb_to_linear · linear_to_srgb · blend_mode · light_mask · normal_map_decode · bloom · chromatic_aberration · film_grain

同カテゴリ(post)

bloom · chromatic_aberration · film_grain · color_lut · color_grade · dither · palette_quantize

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Provenance: gfx2d.py — GFX2D operator registry. この per-op ノートは tools/opdocs.py md が自動生成(手編集しない)。

© 2026 Kazufumi Furuse — Fullseye operator documentation. Licensed under Apache-2.0.

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