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Recorded on 26 October 2026, unchanged since

Entry #210 of UpFork’s ledger · A lesson's version: React Native Skia's web canvas is Display P3 but draws the sRGB numbers it gets: saturated colours come out stronger Open it

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Recorded: 26 Oct 2026, 13:20 UTC
Signed with: k1 · Ed25519
Entry hash: 055251d76375742e58e9be486f241e463da9843f2322cf7e3beea730064969ea
Before it: 73ed0ac8730e2dd715c9ec5f6d15764a2281adcef9cdb0073a96cf82c3300313
Record hash: 8156dc439b5914e7cb6c21fcd12025bd86bc466464902f9d2db69f837f1562b2
Signature: /0HKiJcSAfa6aI133kPebspp9H3uOgZhQiihiXUxQvVza8v6iTYxk14YwjNqnbEnsB0QDhNl/nAZ0rscpls1CA==

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{
  "ai": {
    "apps": [
      "Claude"
    ],
    "models": [
      "Claude Opus 5.5"
    ]
  },
  "article": "confirm-button-a-liquid-two-step-delete-for-react-native-and-seven-skia-trap",
  "articleRevision": 1,
  "assumed": "a colour handed to a Skia `<Canvas>` shows on the web as the same sRGB colour it does in CSS.",
  "author": {
    "account": "a_9d470b566acab5f65bdc",
    "handle": "ramin-valadan"
  },
  "evidence": "the build's pixel samples before and after; oklab.ts lines 34–60; commits 9604802 and 8f6724b; `lib/web-colors.tsx` in Goal Ring and Gooey Tab Bar.",
  "fix": "on the web, Confirm Button turns its OKLab colours into linear sRGB, converts them with the linear sRGB to linear Display P3 matrix, and encodes the result; the same sample then read (215, 52, 58). Goal Ring and Gooey Tab Bar later got a general version, `WebColors`: the canvas's content is drawn into a layer whose colour filter does the same conversion in linear light, and only where the browser has P3 canvases (`'drawingBufferColorSpace' in WebGL2RenderingContext.prototype`). Goal Ring's `#22C55E`, which had shown as `#00C952`, then read `#22C55E`.",
  "happened": "the danger red `#D7343A`, (215, 52, 58), came out as (234, 20, 49) in the screenshot, while the greys were exact. A plain square filled with the literal colour did the same, so it wasn't the blending or the shadow. On the web, React Native Skia's view sets the WebGL2 context's `drawingBufferColorSpace` to `\"display-p3\"` whenever it sizes its canvas (`SkiaPictureView.web.js`), and CanvasKit still writes the sRGB numbers it's given, so the browser reads them as P3 numbers, with wider primaries: more saturation. Greys are the same numbers in both spaces, so they don't move.",
  "kind": "not-in-docs",
  "learnedBy": "ai",
  "lesson": "L-D7H0",
  "packages": "@shopify/react-native-skia@2.6.2",
  "product": "confirm-button-react-native",
  "productRevision": 1,
  "publishedAt": "2026-10-26T13:19:26.932Z",
  "site": "https://upfork.dev",
  "title": "React Native Skia's web canvas is Display P3 but draws the sRGB numbers it gets: saturated colours come out stronger",
  "type": "lesson-version",
  "url": "https://upfork.dev/lessons/L-D7H0",
  "version": 1,
  "why": ""
}