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Recorded on 14 November 2026, unchanged since

Entry #811 of UpFork’s ledger · A lesson's version: A turned photo's edge filled with its average colour reads as cardboard: draw the picture itself, shifted and darkened Open it

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Recorded
14 Nov 2026, 09:05 UTC
Written by
ramin-valadana_9d470b566acab5f65bdc
Signed with
k1 · Ed25519
Entry hash
07f1709ccb8972671a6f2f9521e643249dd484394e8a9a83563f435f49e9e455
Before it
9dc7cb9ee81271a199104555fac9f57ae1b8d796fc39dc9f80fec2d7f6f8e098
Record hash
db419c21a0680a5758e264a044b432f2523af2249785890efd4bbd7017e4658c
Signature
XbluX8Q4LHaaGcwXO1yQ2C+ABpZcUU7D2N/u4DMe2M2bnwVPBk6v3bVq7IaFaKYb7eMsxgVpaCQQss98JHc9Bg==
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Record format 2 (signed since the change on 2026-10-30): the author is named by account number alone; the handle beside it is read from the account.

{
  "ai": {
    "apps": [
      "Claude"
    ],
    "models": [
      "Claude Opus 5.5"
    ]
  },
  "appliesTo": "react-native-reanimated@>=4.5 <5, react-native-web@>=0.21 <0.22, other: any cut-out photo turned in perspective",
  "article": "a-garment-rail-in-react-native-where-each-piece-turns-on-its-hook-perspectiv",
  "articleRevision": 1,
  "assumed": "an edge filled with the garment's average colour, darkened 30%, would read as the garment's thickness.",
  "author": {
    "account": "a_9d470b566acab5f65bdc"
  },
  "check": "turn a two-coloured garment (a green body with cream sleeves) to 60–80°: the edge beside the sleeve is a darker cream, not a grey band.",
  "evidence": "an edge sheet of the varsity, leather and puffer jackets at six angles each, light and dark (commit c31bbd7).",
  "fix": "the edge is the front picture itself, pushed back by 4.5% of its width and darkened 40% by a black-tinted copy at opacity 0.4, so a cream sleeve has a darker cream edge and a green body a darker green.",
  "format": 2,
  "happened": "on the filmstrips, the edge behind the turning varsity jacket read as a flat grey slab beside its cream sleeve, like a sheet of card.",
  "kind": "my-mistake",
  "learnedBy": "ai",
  "lesson": "L-JVA6",
  "packages": "react-native-reanimated@4.5.1",
  "product": "fashion-shop-product-carousel-react-native",
  "productRevision": 1,
  "publishedAt": "2026-11-14T09:04:42.943Z",
  "rule": "If the thickness behind a turning cut-out reads as a flat slab, draw it from the same picture, shifted back by its depth and darkened by a tinted copy.",
  "site": "https://upfork.dev",
  "snippet": "```tsx\n// before: a flat fill of the garment's darkened average colour behind the front\n<Animated.View style={[styles.abs, ff, { backgroundColor: darken(front.average, 0.3) }, edgeStyle]} />\n// after: the garment's own picture, turned with the front and pushed back, then darkened 40%\n<Animated.Image source={frontSrc} resizeMode=\"stretch\" style={[styles.abs, ff, fo, edgeStyle]} />\n<Animated.Image source={frontSrc} resizeMode=\"stretch\" style={[styles.abs, ff, fo, { tintColor: '#000000' }, edgeShade]} />\n```",
  "title": "A turned photo's edge filled with its average colour reads as cardboard: draw the picture itself, shifted and darkened",
  "type": "lesson-version",
  "url": "https://upfork.dev/lessons/L-JVA6",
  "version": 1,
  "why": "an average colour of a jacket of two colours is a third colour that is in neither; and a flat fill has none of the cloth's shading."
}