tb_env_lightbox — 2D `typed` op

• Data kinds: points → signal

• Call: fullseye.apply(img, "tb_env_lightbox", a=0.5, b=0.5) (the 2-D model is one image plus two scalar knobs a,b∈[0,1])

tb_env_lightbox: input → output

*The figure is the actual output on a synthetic 128×128 input. Left: input, right: output. Point clouds are drawn as a top-down scatter (brightness = z), 1-D series as a line plot, volumes as the maximum-intensity projection along z, videos as the middle frame, complex images as magnitude; return values that are not pictures are shown as the values themselves.*

Sweeping knob a (0.1 / 0.5 / 0.9, the other knob at its default):

▸ tb_env_lightbox: knob a sweep (docs site)

Sweeping knob b (0.1 / 0.5 / 0.9, the other knob at its default):

▸ tb_env_lightbox: knob b sweep (docs site)

Stages (the ops that come before → this op, left to right):

▸ tb_env_lightbox: stages (docs site)

On other images (synthetic scene / photo / coins. Top row: inputs, bottom row: their outputs. Knobs at default):

▸ tb_env_lightbox: other inputs (docs site)

Usage

Environment of a photo light box (broad overhead light + a faintly bright surround). Achromatic.

> The detailed description below is the original text — the summary and the headings are translated.

:func:env_studio が「劇的に見せる」ための暗い部屋 + 小さいソフトボックス 2 灯

なのに対し、こちらは加工面が加工面に見えるための環境。2026-09-05 の実測で

分かった 2 つの条件を満たすように作ってある:

• 周囲が明るいこと ―― 暗い環境だとアルミが真っ黒になる(反射率 ~0.9 の金属が

黒く写るのは、映るものが黒いから)。

• それでも勾配があること ―― 完全に一様な環境では、どんな異方性ローブでも

同じ値を返すので加工目が消える。ブラシ目が見えるのは、目が環境の明暗を

目方向に引き伸ばすからである。

加工目は斜めから見ないと出ない(真上から見た平面は反射方向が全画素で天頂に

集中し、環境の勾配を掃かない)。`optical_camera(tilt_deg=50〜70)` 程度が目安。

2-D 進化レジストリへ橋渡しした optics の op `env_lightbox。実装は同じで、呼び出し規約だけ op(v, a, b) に合わせてある。a が base(既定 0.45)、b が key`(既定 4)を振る。

References (sample data, literature)

• Sample-data catalog (download URLs / licences) — 2-D uses skimage.data (BSD/public domain) plus synthetic images; 3-D lists download URLs for real data sources (Stanford, PDS, …).

• Operator provenance and references — the sources of the research/methods this op family came from.

Try it in Studio

The program below has been verified to run (same input as the figure). In Studio's help this block becomes buttons that load and run it on the spot.

img_to_points 0.50 0.50
tb_env_lightbox 0.50 0.50

▸ Load this pipeline · Load & run

Runnable examples (verified samples that actually call this op)

The examples below call the underlying ledger op env_lightbox. This bridge op is the same implementation adapted to the fn(v, a, b) convention, so the behaviour carries over unchanged (only the call form differs).

• studio_raytrace_scene — py -3.11 examples/studio_raytrace_scene.py

Ops the type connects to (they accept `signal` as input)

identity · tb_create_funct_1d_array · tb_smooth_funct_1d_gauss · tb_smooth_funct_1d_mean · tb_derivate_funct_1d · tb_integrate_funct_1d · tb_zero_crossings_funct_1d · tb_abs_funct_1d

Same category (`typed`)

tb_points_to_voxel · tb_estimate_point_normals · tb_iss_keypoints · tb_project_points · tb_render_point_depth · tb_statistical_outlier_removal · tb_radius_outlier_removal · tb_voxel_grid_downsample

*Provenance: ops.py — 2D operator registry. This per-op note is generated by tools/opdocs.py md (do not hand-edit).*

tb_env_lightbox — 2D typed op