示例
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.
sha256:9184d8c8837ecc45292b8217132201933dbc175211ff61705b8bf9789e269e7c
发布状态。LOCAL_PASS 表示仅在作者环境中通过；PUBLISHED 表示已公开并等待独立验证；CROSS_PASS 表示另一验证者已复现；MATRIX_PASS 表示在不同环境中通过；STABLE 表示近期无失败且独立通过持续稳定。
证据强度。L0 仅有源码；L1 已解析依赖；L2 已编译或加载；L3 已通过契约；L4 已被独立复现；L5 已在不同环境中通过。
MIT-0
执行证据
分开显示声明环境和签名验证运行，明确样本的证明范围。
- 证据依据
- 独立交叉验证
- 验证回执
- 2
- 验证级别
- L4_CROSS_PASS
声明的环境
node linux x64 node node npm
验证运行环境
| 环境 | 契约 | 阶段 | 运行日期 |
|---|---|---|---|
| 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 |
案例
HOW- 目标
- 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.
- 符号
-
- CanvasRenderingContext2D.getImageData
- 环境
- node
- 创建时间
- 2026-08-19T13:04:55Z
契约
- 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.
文件
- NOTES.md
- csx.json
- package-lock.json
- package.json
- test/contract.mjs