fullseye

blend_mode — GFX2D composite op

• データ種: rgb × rgb → rgb
• 呼び出し: import fullseye as fs; fs.ledger.blend_mode(base, top, mode='normal', opacity=1.0) (実装を直接呼ぶなら import gfx2d; gfx2d.blend_mode(base, top, mode='normal', opacity=1.0)、台帳から引くなら opsgfx2d.get("blend_mode"))

使い方

Blend two opaque rgb images with a named mode (W3C Level 1).

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(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

型が繋がる次の op(rgb を入力に取れる)

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

同カテゴリ(composite)

premultiply · unpremultiply · alpha_composite · alpha_composite_premul · layer_stack

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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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