engrave_lines — PRINTPATH `npr` op

• データ種: image2d → image2d

• 呼び出し: import fullseye as fs; fs.ledger.engrave_lines(image, spacing_px=6.0, angle_deg=0.0, gamma=1.0, max_width=0.95) (実装を直接呼ぶなら import printpath; printpath.engrave_lines(image, spacing_px=6.0, angle_deg=0.0, gamma=1.0, max_width=0.95)、台帳から引くなら opsprintpath.get("engrave_lines"))

使い方

Copperplate engraving — parallel lines whose width carries the tone.

★Why this earns its place: while the lines do not touch, the ink coverage

of a ruling of width `w and spacing d is exactly w / d`. So the width

needed for a target tone is solved, not tuned: `w = (1 - tone) * d`. The

op therefore has a closed form to be graded against — blur the result and the

local mean must come back to the tone you asked for.

Parameters

----------

image : 2-D array in [0, 1]

spacing_px : float

Line spacing. The finest tone step a ruling can hold is `1 / spacing`.

angle_deg : float

gamma : float

Tone shaping applied before solving for the width (`tone**gamma`).

max_width : float

Widest line as a fraction of the spacing; 1.0 would make solid black and

lose the ruling.

Returns an `image2d`: 1 = paper, 0 = ink.

Raises `ValueError`: spacing below 2 px (the ruling cannot be sampled);

`max_width` outside (0, 1]; non-positive gamma; a non-finite or oversized image.

詳しい使い方ガイド

• printpath ファミリガイド

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)

• poc_beats_fringes_and_screens — py -3.11 examples/poc_beats_fringes_and_screens.py

型が繋がる次の op(`image2d` を入力に取れる)

stipple_points_from_image · stipple_energy · stroke_tone_error · halftone_screen · hatch_field · mosaic_tiles_sites · mosaic_tiles_render · print_layer_defect_map

同カテゴリ(`npr`)

halftone_screen · halftone_moire_period · hatch_field · mosaic_tiles_sites · mosaic_tiles_render

*Provenance: printpath.py — PRINTPATH 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)。*

engrave_lines — PRINTPATH npr op

使い方