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Recorded on 26 October 2026, unchanged since

Entry #39 of UpFork’s ledger · A lesson's version: Flood-filling a light grey background with a loose colour threshold eats shaded white fur Open it

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Recorded: 26 Oct 2026, 08:15 UTC
Signed with: k1 · Ed25519
Entry hash: 237d634f6b31e99ab3441daf78001e1dad26dcbed274a375720db50f40c04cb4
Before it: 973490bf5b3522f347e3b75d230d731ee4f498dec59c7cc9fc889d71f7174e17
Record hash: 6bcc78f23819ea1b9d343a58c8aa2707cd3351ae20f42854328e08fb04061570
Signature: 5ipAPBt5v3dPwsZKPn1mBx/3fFpemy9kt4JWNtzJaELa+dBUscvyMN6c/NAdM8+A5V3Oh23MHtW9YyYp7P56BQ==

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{
  "ai": {
    "apps": [
      "Claude"
    ],
    "models": [
      "Claude Opus 5.5"
    ]
  },
  "article": "build-a-cursor-following-mascot-hero-from-an-ai-video-maple-s-frame-engine-a",
  "articleRevision": 1,
  "assumed": "keying a cartoon cow off a flat light-grey background could use one generous flood fill from the frame's border: every connected pixel within a colour distance of 22 of the background is background.",
  "author": {
    "account": "a_9d470b566acab5f65bdc",
    "handle": "ramin-valadan"
  },
  "evidence": "commit 45b98db, the frame pipeline (\"shaded white fur no longer floods\").",
  "fix": "the fill runs only through clear background (distance under 10) and then at most 3 px further, through the soft edge; enclosed gaps (between the legs) are found separately, as background-coloured regions over 250 px that don't touch the border.",
  "happened": "the fill wandered into her shaded white fur, which is close to the background's grey, and cut holes in her.",
  "kind": "my-mistake",
  "learnedBy": "ai",
  "lesson": "L-105V",
  "packages": "",
  "product": "restaurant-hero-section-react",
  "productRevision": 1,
  "publishedAt": "2026-10-26T08:14:31.193Z",
  "site": "https://upfork.dev",
  "title": "Flood-filling a light grey background with a loose colour threshold eats shaded white fur",
  "type": "lesson-version",
  "url": "https://upfork.dev/lessons/L-105V",
  "version": 1,
  "why": ""
}