{
  "title": "Kompixa published browser image benchmark results",
  "resultsVersion": "2026-07-30.1",
  "benchmarkVersion": "2.1",
  "publishedAt": "2026-07-31",
  "methodology": "/assets/benchmark-methodology-v2.1.json",
  "environment": {
    "browser": "Brave 150 (Chromium 150)",
    "platform": "Windows",
    "hardwareConcurrency": 16,
    "deviceMemoryGiB": 32,
    "avifEncodingSupported": false
  },
  "protocol": {
    "warmupRepeats": 1,
    "measuredRepeats": 3,
    "timingStatistic": "median"
  },
  "full100": {
    "generatedAt": "2026-07-30T22:34:14.953Z",
    "elapsedMs": 24259.2,
    "scenes": 100,
    "outputs": 300,
    "sourceFileBytes": 293351,
    "sourceSha256": "7ecff7e69b8c0e1bb48e0eacfea787110a3a4934f325135e0f9528c3c41534be",
    "overall": {
      "png": {
        "medianBytes": 131646.5,
        "medianEncodeMs": 6.7,
        "lossless": true
      },
      "jpeg82": {
        "medianBytes": 26032,
        "medianEncodeMs": 5.8,
        "averagePsnrDb": 41.48,
        "medianSavingVsPngPercent": 72.1
      },
      "webp82": {
        "medianBytes": 23075,
        "medianEncodeMs": 17.0,
        "averagePsnrDb": 38.99,
        "medianSavingVsPngPercent": 78.2
      }
    },
    "categories": [
      {
        "category": "Photo-like detail",
        "png": {"medianBytes": 540528, "medianEncodeMs": 9.8},
        "jpeg82": {"medianBytes": 52653, "medianEncodeMs": 5.4, "averagePsnrDb": 41.58, "medianSavingVsPngPercent": 90.2},
        "webp82": {"medianBytes": 38642, "medianEncodeMs": 24.8, "averagePsnrDb": 40.92, "medianSavingVsPngPercent": 92.8}
      },
      {
        "category": "Interface and text",
        "png": {"medianBytes": 10372, "medianEncodeMs": 5.9},
        "jpeg82": {"medianBytes": 20436, "medianEncodeMs": 5.0, "averagePsnrDb": 45.05, "medianSavingVsPngPercent": -95.9},
        "webp82": {"medianBytes": 4466, "medianEncodeMs": 12.0, "averagePsnrDb": 44.64, "medianSavingVsPngPercent": 54.1}
      },
      {
        "category": "Transparent graphic",
        "png": {"medianBytes": 272829, "medianEncodeMs": 6.6},
        "jpeg82": {"medianBytes": 23906, "medianEncodeMs": 6.6, "averagePsnrDb": 40.52, "medianSavingVsPngPercent": 91.2, "note": "Transparency flattened to white."},
        "webp82": {"medianBytes": 45008, "medianEncodeMs": 46.2, "averagePsnrDb": 30.32, "medianSavingVsPngPercent": 83.6}
      },
      {
        "category": "Flat illustration",
        "png": {"medianBytes": 56698, "medianEncodeMs": 5.2},
        "jpeg82": {"medianBytes": 27416, "medianEncodeMs": 5.6, "averagePsnrDb": 38.76, "medianSavingVsPngPercent": 51.5},
        "webp82": {"medianBytes": 15938, "medianEncodeMs": 15.2, "averagePsnrDb": 40.10, "medianSavingVsPngPercent": 72.4}
      }
    ]
  },
  "matched24": {
    "generatedAt": "2026-07-30T22:36:12.112Z",
    "elapsedMs": 25679.6,
    "scenes": 24,
    "outputs": 264,
    "sourceFileBytes": 247189,
    "sourceSha256": "ccd7755cf5efbeb899237a23c4d085dc8b22a4f501f1c936eb6bae35dfa3c312",
    "allScenes": {
      "pairs": 24,
      "medianClosestPsnrGapDb": 0.111,
      "medianWebpSizeDeltaAtClosestPsnrPercent": -37.0,
      "medianClosestSizeGapPercent": 12.0,
      "medianWebpPsnrDeltaAtClosestSizeDb": 1.92
    },
    "opaqueOnly": {
      "pairs": 18,
      "medianClosestPsnrGapDb": 0.075,
      "medianWebpSizeDeltaAtClosestPsnrPercent": -57.1,
      "medianClosestSizeGapPercent": 5.8,
      "medianWebpPsnrDeltaAtClosestSizeDb": 4.84,
      "excluded": "Transparent graphic",
      "reason": "JPEG flattened alpha to white while WebP preserved transparency."
    },
    "categories": [
      {"category": "Photo-like detail", "pairs": 6, "medianClosestPsnrGapDb": 0.074, "medianWebpSizeDeltaAtClosestPsnrPercent": -8.2, "medianClosestSizeGapPercent": 5.8, "medianWebpPsnrDeltaAtClosestSizeDb": 0.03},
      {"category": "Interface and text", "pairs": 6, "medianClosestPsnrGapDb": 0.062, "medianWebpSizeDeltaAtClosestPsnrPercent": -77.3, "medianClosestSizeGapPercent": 62.2, "medianWebpPsnrDeltaAtClosestSizeDb": 5.74},
      {"category": "Flat illustration", "pairs": 6, "medianClosestPsnrGapDb": 0.132, "medianWebpSizeDeltaAtClosestPsnrPercent": -57.1, "medianClosestSizeGapPercent": 4.5, "medianWebpPsnrDeltaAtClosestSizeDb": 4.85},
      {"category": "Transparent graphic", "pairs": 6, "headlineEligible": false, "note": "Not used for JPEG-versus-WebP headline comparisons because JPEG flattened alpha."}
    ]
  },
  "limitations": [
    "Synthetic scenes do not represent every production image.",
    "Sampled PSNR is not a complete model of perceived quality.",
    "Results apply to this browser and device, not all encoders.",
    "AVIF encoding was unavailable.",
    "Timing is affected by browser, operating system and scheduling.",
    "JPEG and WebP transparency results are not directly equivalent."
  ]
}