サンプル

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

MIT-0

実行証拠

宣言環境と署名済み検証実行を分け、証明範囲を明確にします。

宣言された環境 node linux x64 node node npm

環境	コントラクト	ステージ	実行日
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

HOW

ゴール: 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.
パッケージ: three 0.185.1
シンボル: CanvasRenderingContext2D.getImageData
環境: node
作成日: 2026-08-19T13:04:55Z

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.