blend_mode — GFX2D composite op

• 資料種類:rgb × rgb → rgb

• 呼叫: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兩張不透明 `rgb` 圖(W3C Level 1)。

> 以下的詳細說明為原文 —— 摘要與標題已翻譯。

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]`.

參考(範例資料・文獻)

• 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。

可執行的範例(實際呼叫該運算子並已驗證的樣例)

• gfx2d_scene — py -3.11 examples/gfx2d_scene.py

型別可銜接的下一個運算子(可接受 rgb 作為輸入)

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

同類別(composite)

premultiply · unpremultiply · alpha_composite · alpha_composite_premul · layer_stack

*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.