blend_mode — GFX2D composite op

• 数据种类:rgb × rgb → rgb

• 调用:import gfx2d; gfx2d.blend_mode(base, top, mode='normal', opacity=1.0)(或 opsgfx2d.get("blend_mode"))

用法

用指定的混合模式合成两张不透明 `rgb` 图(W3C Level 1)。

> 以下的详细说明为原文 —— 摘要与标题已翻译。

With an opaque backdrop the specification reduces to a lerp,

`Co = (1 - opacity)*Cb + opacity*B(Cb, Cs), so opacity=0` returns the

backdrop exactly and `mode="normal", opacity=1` returns the source

exactly. Both identities are checked bit-for-bit in the test suite.

Named `blend_mode and not blend because :func:imagemorph.blend`

already owns that name for a two-image cross-fade; two functions called

`blend` with different signatures is exactly the kind of collision this

library's naming test exists to prevent.

Raises ValueError: unknown mode, mismatched shapes, opacity outside

`[0, 1], values outside [0, 1]`.

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 · light_mask · normal_map_decode · bloom · vignette · chromatic_aberration · film_grain

同类别(composite)

premultiply · unpremultiply · alpha_composite · alpha_composite_premul · layer_stack

*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.