post oprgb → rgbimport fullseye as fs; fs.ledger.bloom(rgb, threshold=0.8, sigma=4.0, intensity=0.6) (実装を直接呼ぶなら import gfx2d; gfx2d.bloom(rgb, threshold=0.8, sigma=4.0, intensity=0.6)、台帳から引くなら opsgfx2d.get("bloom"))Bleed the bright parts of an image into their neighbourhood.
The classical three steps: isolate what is above threshold, blur it by a
Gaussian of sigma, add intensity times the result back, clip.
A linear-light operator: light spreading in a lens adds radiance. Running
it on sRGB-encoded values makes the halo too strong in the mid-tones —
srgb_to_linear first, linear_to_srgb after.
Exact identities: intensity=0 and threshold >= 1 both return the
input bit for bit, and a black image stays black.
The added energy is not conserved by the clip at the end. The suite measures both halves: on a centred bright blob the Gaussian preserves the bright mass to 5.0e-16 relative, so everything lost after that is the clip — on a random scene with a saturated square, 2.69 % of the pixels clip and 1.65 % of the total energy is thrown away, and neither number is returned to the caller.
py -3.11 examples/gfx2d_scene.pyrgb を入力に取れる)srgb_to_linear · linear_to_srgb · blend_mode · light_mask · normal_map_decode · vignette · chromatic_aberration · film_grain
post)vignette · chromatic_aberration · film_grain · color_lut · color_grade · dither · palette_quantize
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.