{
  "title": "Swallowtail butterfly",
  "photographer": "Lisa Redfern (Lisafern)",
  "sourcePage": "https://commons.wikimedia.org/wiki/File:Swallowtail_butterfly_-_Public_Domain.jpg",
  "license": "CC0 1.0 Universal Public Domain Dedication",
  "licenseURL": "https://creativecommons.org/publicdomain/zero/1.0/",
  "dimensions": [
    5184,
    3456
  ],
  "originalBytes": 9148304,
  "outputBytes": 6914997,
  "savedBytes": 2233307,
  "savingPercent": 24.412251713541657,
  "formatChange": "JPEG to JPEG XL",
  "engine": "Actual KarmaDiskOptimize.JPEGXLConversion.convert from freshly built release objects; libjxl 0.12 bridge effort5",
  "verification": {
    "conversionSucceeded": true,
    "receiptPersisted": true,
    "JPEGXLConversion_verifyForCleanup": "passed",
    "fullSourceByteReconstruction": "identical",
    "sourcePreserved": true
  },
  "notClaimed": [
    "Not typical or guaranteed savings",
    "Not measured disk-space reclaimed: originals retained",
    "Not a JPEG-to-JPEG result",
    "Not proof Photos library or HEIC photos shrink by24%"
  ],
  "measurementDate": "2026-10-21",
  "inputSHA256": "b4258347a9427b4cfbaed96d9e3d735d1475aca1a7ed8be03d8ebe5391f34b2c",
  "outputSHA256": "f1d2e0e1135f193974ef87a0724eb56671a7e9c4683a8617b8676c2de979c7e7",
  "appReproduction": {
    "edition": "Mac App Store",
    "version": "1.2.0",
    "build": "1.2.3",
    "workflow": "Photos > Make smaller > JPEG XL",
    "sameOutputHash": true,
    "originalKept": true
  }
}