srgb_to_linear — GFX2D colorspace op

• Data kinds: rgb → rgb

• Call: import gfx2d; gfx2d.srgb_to_linear(img) (or opsgfx2d.get("srgb_to_linear"))

Usage

sRGB-encoded values to linear light (IEC 61966-2-1).

An alpha channel, if present, is not transformed — coverage is already

linear. Accepts `(H, W), (H, W, 1|3|4)`.

Use this before anything that adds or scales light (:func:radial_light,

:func:light_mask, :func:normal_map_shade, :func:bloom) if the input

came out of an image file. Skipping it does not raise: it makes highlights

bloom too early and shadows too dark, by the amount quoted in the module

docstring.

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.

• The canonical algorithm (author, year) and its uses are named in the family usage guide above.

Runnable examples (verified samples that actually call this op)

• gfx2d_scene — py -3.11 examples/gfx2d_scene.py

Ops the type connects to (they accept rgb as input)

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

Same category (colorspace)

linear_to_srgb

*Provenance: gfx2d.py — GFX2D operator registry. This per-op note is generated by tools/opdocs.py md (do not hand-edit).*

© 2026 Kazufumi Furuse — Fullseye operator documentation. Licensed under Apache-2.0.