Sample
three 0.185.1: ImageUtils.sRGBToLinear and Lut extract pixel buffers via CanvasRenderingContext2D.getImageData, converting canvas textures through non-linear sRGB transfer curves that alter all 4 channels including alpha while mapping Lut colormaps top-down.
Verified sample for npm three 0.185.1: ImageUtils.sRGBToLinear and Lut extract pixel buffers via CanvasRenderingContext2D.getImageData, converting canvas…
sha256:9184d8c8837ecc45292b8217132201933dbc175211ff61705b8bf9789e269e7c
This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured.
How many distinct signing keys filed a passing contract receipt. One is the author alone; more than one means somebody else built it too. A key is self-generated with nothing registered behind it, so it counts keys, not people.
MIT-0
Execution evidence
The declared environment and the signed runs are kept apart, so you can see exactly what this sample ran and where.
- Evidence basis
- Signed contract pass
- Verification receipts
- 2
- Signing keys that built it
- 2
Declared environment
node linux x64 node node npm
Verification-run environments
| Environment | Contract | Stages | Run |
|---|---|---|---|
| node 22 · linux alpine/x64 · docker ed25519:d91480838ac982c9 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · node-typescript@1 |
2026-08-19 |
| node 22 · linux alpine/x64 · docker ed25519:2175b912ea1c23b1 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · node-typescript@1 |
2026-08-19 |
Case
HOW- Goal
- ImageUtils.sRGBToLinear and Lut extract pixel buffers via CanvasRenderingContext2D.getImageData, converting canvas textures through non-linear sRGB transfer curves that alter all 4 channels including alpha while mapping Lut colormaps top-down.
- Packages
- Symbols
-
- CanvasRenderingContext2D.getImageData
- Environment
- node
- Created
- 2026-08-19T13:04:55Z
Contract
- ImageUtils.sRGBToLinear extracts canvas pixel data via CanvasRenderingContext2D.getImageData and applies the sRGB-to-linear conversion curve across all 4 channels, transforming translucent alpha values rather than preserving alpha intact.
- ImageUtils.sRGBToLinear on HTMLCanvasElement creates a new canvas and puts converted ImageData without mutating the source canvas in place.
- ImageUtils.sRGBToLinear on raw byte buffers uses Math.floor truncation while ImageData uses Uint8ClampedArray nearest-integer rounding.
- Lut.updateCanvas queries CanvasRenderingContext2D.getImageData for a 1xN buffer and populates color stops from top (y=0, i=1.0) to bottom (y=N-1, i=0.0) with full opacity (alpha=255).
- ImageUtils.sRGBToLinear returns unsupported objects directly with a warning when neither canvas interfaces nor data buffers are present.
Files
- NOTES.md
- csx.json
- package-lock.json
- package.json
- test/contract.mjs