Auto Mask strokes weight each dab by similarity (log luminance + chromaticity) to the pixel under
its centre and are refined by a cross guided filter on log luminance (max-combined, never removing
paint). Local Noise smooths small-amplitude luminance detail (negative boosts it) and calms colour
noise; Moiré blends chromaticity towards a blurred plane (appended to the GPU mask buffer);
Defringe desaturates purple/green casts on edges. Pixel tests per slider and for the edge
constraint, CPU/GPU equivalence cases, Auto Mask checkbox and Moiré/Defringe sliders in the panel.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
RenderRequest gains an output space (default sRGB; previews stay sRGB). The per-pixel stage converts
scene-linear Rec.2020 to the target primaries, gamut-maps into the target gamut and encodes with the
target curve, on CPU and GPU (WGSL finish kernel reads the matrix, luma weights and curve from its
parameter block). sRGB output is byte-identical to before on the CPU. Export embeds our own
generated ICC profile for the space; AVIF stays sRGB. ExportOptions.colorSpace, export dialog and
MCP export schema. Tests: P3 colour survives a P3 export (decoded through the embedded profile),
every space/format round-trips its profile, GPU equivalence per space.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Up to 8 OkLCh samples (pointColor.pick samples the colour after the mixer on a proxy render);
per sample hue/saturation/luminance shift, variance (compress/expand the spread around the
sample) and an overall + per-axis range with soft edges, applied after the colour mixer in
ColorOps and its WGSL twin (equivalence case). Indexed control specs
(pointColor.<i>.hueShift …) so develop.set/controls/MCP address each sample. Visualize range
is a render overlay (RenderRequest::overlay) drawn after either renderer: the sample's own
edit is left out and colours outside the range turn grey. Point Color flyout in the Color
section with swatches, eyedropper, sliders, visualize and delete.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
curve.refineSaturation (0..100, default 100 = the curve's own saturation): after the tone
curves, the chroma around luma is rescaled so saturation moves from the curve's towards the
pre-curve value, keeping the curve's tone. CPU (finish::refine_saturation) and GPU twin,
equivalence case, slider under the curve editor, crs:CurveRefineSaturation import.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
White-preserving primaries matrix (OkLCh hue rotation / chroma scale of each Rec.2020
primary) plus a luminance-preserving green/magenta shadows tint, applied in scene-linear
light before the tone map. CPU (colorops::calibrate) and GPU (finish.wgsl) with an
equivalence case; seven control specs (calibration.*), a settings group, crs: import
(ShadowTint, Red/Green/BlueHue/Saturation) and a Calibration section at the bottom of the
Edit panel.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
New L3 crate `lightcraft-gpu`: a wgpu device (Metal/Vulkan/DX12; none on wasm32),
WGSL kernels compiled once, buffer/dispatch/readback helpers, and a renderer that
runs the per-pixel stage (tone map, highlights/shadows, clarity/texture/sharpen,
dehaze, local mask terms, OkLCh colour ops, grading, vignette, gamut map, sRGB
encode, curves, grain) on the device. Earlier stages still run on the CPU and are
uploaded (per-stage hybrid). Stage results are cached per view next to the CPU
StageCache (new `StageCache::extension`).
The CPU pipeline stays the oracle and shares its resolved parameters with the
kernels: `finish::FinishParams` / `mask_terms`, `pipeline::plan` (stage-cache keys),
`local::plane_sigmas` / `nr_params` / `wb_matrix_for`, exact LUTs and OkLab
matrices exported for the shader prelude. Equivalence tests (skip without an
adapter): mean |d| < 0.5 LSB, max <= 3 LSB; measured max 1 LSB on Apple M4 Pro.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
