post op• 資料種類:rgb → rgb
• 呼叫: import fullseye as fs; fs.ledger.vignette(rgb, strength=0.6, radius=1.0, power=2.0)(要直接呼叫實作,import gfx2d; gfx2d.vignette(rgb, strength=0.6, radius=1.0, power=2.0);從台帳取用則 opsgfx2d.get("vignette"))
向四角變暗:out = rgb * (1 - strength * t**power)。
> 以下的詳細說明為原文 —— 摘要與標題已翻譯。
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.
• 範例資料目錄(下載 URL / 授權) —— 2-D 用 skimage.data(BSD/公有領域)加合成圖,3-D 給出真實資料源(Stanford/PDS 等)的下載 URL。
• 運算子來歷與參考文獻 —— 該運算子族所依據的研究/方法出處。
• 演算法的正典(作者、年份)與用途見上面的族使用指南。
• 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
rgb 作為輸入)srgb_to_linear · linear_to_srgb · blend_mode · light_mask · normal_map_decode · bloom · chromatic_aberration · film_grain
post)bloom · chromatic_aberration · film_grain · color_lut · color_grade · dither · palette_quantize
*Provenance: gfx2d.py — GFX2D 運算子登記表。本條目由 tools/opdocs.py md 自動產生(請勿手動編輯)。*
© 2026 Kazufumi Furuse — Fullseye operator documentation. Licensed under Apache-2.0.