vignette — GFX2D post op

• 数据种类:rgb → rgb

• 调用:import gfx2d; gfx2d.vignette(rgb, strength=0.6, radius=1.0, power=2.0)(或 opsgfx2d.get("vignette"))

用法

向四角变暗:`out = rgb * (1 - strength * t**power)`。

> 以下的详细说明为原文 —— 摘要与标题已翻译。

`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(示例数据・文献)

• 示例数据目录(下载 URL / 许可证) —— 2-D 用 skimage.data(BSD/公有领域)加合成图,3-D 给出真实数据源(Stanford/PDS 等)的下载 URL。

• 算子来历与参考文献 —— 该算子族所依据的研究/方法出处。

• 算法的正典(作者・年份)与用途见上面的族使用指南。

可运行的示例(实际调用该算子并已验证的样例)

• gfx2d_scene — py -3.11 examples/gfx2d_scene.py

类型可衔接的下一个算子(可接受 rgb 作为输入)

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

同类别(post)

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

*Provenance: gfx2d.py — GFX2D 算子登记表。本条目由 tools/opdocs.py md 自动生成(请勿手工编辑)。*

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