accepted

WebGPU Exposure Color Pipeline

This report separates published implementation state from accepted evidence. Every value below comes from the schema-v2 registry, the emitted source manifest, or promoted same-lab artifacts.

Open demo Owning skill Published source manifest Registry JSON Tracked v2 bundle manifest Canonical source

Lab id: webgpu-exposure-color-pipeline
Kind: Canonical Lab
Owning skill: Exposure And Color Grading
Execution: rendering
Three.js: 0.185.1
Source hash: sha256:f238d4795026d7eee618bb68657735e143873008a57b23f304866b075361dc97
Published bundle hash: sha256:45227bfccf749ebc2a2a76074f0ae9eefaf8ca9bbae007f33cc0cf52be3f6809
Build revision: sha256:b951f17018466135b2d841a246127bf96c7f617f6274e73736ec257a7293369f
Renderer: Not promoted
Backend: Not promoted
Evidence contract: v2
Tracked release bundle: Present

Claim verdicts

canonicalAcceptancePASS

hardwarePerformanceNOT_CLAIMED

Promoted same-lab media

No same-lab evidence image is promoted for this report. The page intentionally shows status and proof requirements instead of substitute art.

Required capability and runtime proof

Capabilities

native-webgpuaccepted

mechanism-metrics.json backend.isWebGPUBackend=true; WebGPUBackend r185 correctness bundle.

storage-buffersaccepted

storage-resources.json + mechanism-metrics histogram/partial storage byte ledger from native capture.

storage-atomicsaccepted

full-histogram tier uses atomic histogram counters; storage-resources.json histogramBytes recorded.

Runtime proof

renderer-initaccepted

capture-contract + mechanism-metrics after await renderer.init() on native WebGPU backend.

compute-readbackaccepted

exposure-readback.json GPU meter state + validate:artifacts oracle keyLuminance/targetEV parity on the v2 bundle.

current-adapter-timingincomplete

No named-adapter timestamp capture accepted; performance remains INSUFFICIENT_EVIDENCE.

Capture state

Field	Published value
Primary route	`/demos/webgpu-exposure-color-pipeline/`
Cameras	`near, design, far`
Seeds	`0x00000001, 0x9e3779b9`
Modes	`final, meter-source, histogram, adaptation, meter-mask, tone-map, lut`
Capture time	`Not present in the promoted report data`
Adapter identity	`Not promoted`
Raw readback hashes	`Not promoted`

Fixed routes

Kind	Id	Startup state	Status
scenario	`emitter`	`{"scenario":"emitter"}`	accepted
scenario	`gray-card`	`{"scenario":"gray-card"}`	accepted
scenario	`swatches`	`{"scenario":"swatches"}`	accepted
scenario	`bright-window`	`{"scenario":"bright-window"}`	accepted
scenario	`masked-ui`	`{"scenario":"masked-ui"}`	accepted
mechanism	`log-luminance-reduction`	`{"tier":"balanced-log-reduction","mode":"meter-source","scenario":"emitter"}`	accepted
mechanism	`histogram-and-percentiles`	`{"tier":"full-histogram","mode":"histogram","scenario":"emitter"}`	accepted
mechanism	`adaptation`	`{"tier":"balanced-log-reduction","mode":"adaptation","scenario":"bright-window"}`	accepted
mechanism	`metering-masks`	`{"tier":"full-histogram","mode":"meter-mask","scenario":"masked-ui"}`	accepted
mechanism	`tone-mapping`	`{"tier":"balanced-log-reduction","mode":"tone-map","scenario":"swatches"}`	accepted
mechanism	`lut-grading`	`{"tier":"full-histogram","mode":"lut","scenario":"swatches"}`	accepted
tier	`full-histogram`	`{"tier":"full-histogram"}`	accepted
tier	`balanced-log-reduction`	`{"tier":"balanced-log-reduction"}`	accepted
tier	`minimum-fixed-shot`	`{"tier":"minimum-fixed-shot"}`	accepted

Locked tier contracts

full-histogram · accepted

{
  "targetClass": "current-adapter correctness",
  "frameTargetMs": null,
  "resolutionPolicy": {
    "meterGrid": [
      64,
      36
    ],
    "lutEdge": 32
  },
  "mechanismLimits": {
    "meter": "histogram-percentile",
    "histogramBins": 64
  },
  "resourceLimits": {
    "storageBytes": 872
  },
  "degradationFromPrevious": [],
  "preservedInvariants": [
    "GPU EV ownership",
    "single tone map",
    "single output transform"
  ]
}

balanced-log-reduction · accepted

{
  "targetClass": "current-adapter correctness",
  "frameTargetMs": null,
  "resolutionPolicy": {
    "meterGrid": [
      64,
      36
    ],
    "lutEdge": 32
  },
  "mechanismLimits": {
    "meter": "weighted-log"
  },
  "resourceLimits": {
    "storageBytes": 320
  },
  "degradationFromPrevious": [
    "remove histogram clear/bin/prefix/percentile dispatches"
  ],
  "preservedInvariants": [
    "GPU EV ownership",
    "single tone map",
    "single output transform"
  ]
}

minimum-fixed-shot · accepted

{
  "targetClass": "controlled shot",
  "frameTargetMs": null,
  "resolutionPolicy": {
    "meterGrid": null,
    "lutEdge": 32
  },
  "mechanismLimits": {
    "meter": "fixed-shot"
  },
  "resourceLimits": {
    "storageBytes": 320
  },
  "degradationFromPrevious": [
    "disable meter updates",
    "retain authored fixed EV"
  ],
  "preservedInvariants": [
    "single tone map",
    "single output transform"
  ]
}

Limitations

1 required runtime-proof record remain incomplete.
No current-hardware performance claim is published without named-adapter timestamp evidence.