{
 "study": "AiArter image format study",
 "run_date": "2026-10-26",
 "script": "scripts/studies/image_format_study.py",
 "sample_size": 33,
 "inputs_note": "All inputs are AiArter's own product and scene photos, stored as lossy WebP at 800-1080 px on the long side. None is 2000 px or larger, so the 1000 vs 2000 px resize comparison was skipped.",
 "metric": "SSIM on BT.601 luma, 11x11 Gaussian window sigma 1.5, valid borders, vs decoded source",
 "environment": {
  "python": "3.10.12",
  "pillow": "11.3.0",
  "numpy": "2.2.6",
  "libwebp": "1.5.0",
  "libavif": "1.3.0",
  "libjpeg": "6.2",
  "libjpeg_turbo": true,
  "zlib": "1.3.1.zlib-ng",
  "platform": "macOS-27.0.1-arm64-arm-64bit"
 },
 "settings": {
  "JPEG q95": {
   "format": "JPEG",
   "quality": 95,
   "optimize": true,
   "subsampling": "4:2:0"
  },
  "JPEG q85": {
   "format": "JPEG",
   "quality": 85,
   "optimize": true,
   "subsampling": "4:2:0"
  },
  "JPEG q75": {
   "format": "JPEG",
   "quality": 75,
   "optimize": true,
   "subsampling": "4:2:0"
  },
  "JPEG q60": {
   "format": "JPEG",
   "quality": 60,
   "optimize": true,
   "subsampling": "4:2:0"
  },
  "WebP q90": {
   "format": "WEBP",
   "quality": 90,
   "method": 4
  },
  "WebP q80": {
   "format": "WEBP",
   "quality": 80,
   "method": 4
  },
  "WebP q70": {
   "format": "WEBP",
   "quality": 70,
   "method": 4
  },
  "AVIF q70": {
   "format": "AVIF",
   "quality": 70,
   "speed": 6,
   "subsampling": "4:2:0"
  },
  "AVIF q50": {
   "format": "AVIF",
   "quality": 50,
   "speed": 6,
   "subsampling": "4:2:0"
  },
  "AVIF q35": {
   "format": "AVIF",
   "quality": 35,
   "speed": 6,
   "subsampling": "4:2:0"
  },
  "PNG optimize": {
   "format": "PNG",
   "optimize": true
  }
 },
 "images": [
  {
   "file": "demo/apparel-original.webp",
   "width": 806,
   "height": 1000,
   "source_format": "WEBP",
   "source_bytes": 139798,
   "source_metadata_bytes": {}
  },
  {
   "file": "demo/apparel-scene1.webp",
   "width": 806,
   "height": 1000,
   "source_format": "WEBP",
   "source_bytes": 73628,
   "source_metadata_bytes": {}
  },
  {
   "file": "demo/apparel-scene2.webp",
   "width": 806,
   "height": 1000,
   "source_format": "WEBP",
   "source_bytes": 37256,
   "source_metadata_bytes": {}
  },
  {
   "file": "demo/apparel-white.webp",
   "width": 1000,
   "height": 1000,
   "source_format": "WEBP",
   "source_bytes": 55152,
   "source_metadata_bytes": {}
  },
  {
   "file": "demo/food-original.webp",
   "width": 806,
   "height": 1000,
   "source_format": "WEBP",
   "source_bytes": 95268,
   "source_metadata_bytes": {}
  },
  {
   "file": "demo/food-scene1.webp",
   "width": 806,
   "height": 1000,
   "source_format": "WEBP",
   "source_bytes": 44412,
   "source_metadata_bytes": {}
  },
  {
   "file": "demo/food-scene2.webp",
   "width": 806,
   "height": 1000,
   "source_format": "WEBP",
   "source_bytes": 76272,
   "source_metadata_bytes": {}
  },
  {
   "file": "demo/food-white.webp",
   "width": 1000,
   "height": 1000,
   "source_format": "WEBP",
   "source_bytes": 56412,
   "source_metadata_bytes": {}
  },
  {
   "file": "demo/jewelry-original.webp",
   "width": 806,
   "height": 1000,
   "source_format": "WEBP",
   "source_bytes": 103410,
   "source_metadata_bytes": {}
  },
  {
   "file": "demo/jewelry-scene1.webp",
   "width": 806,
   "height": 1000,
   "source_format": "WEBP",
   "source_bytes": 30554,
   "source_metadata_bytes": {}
  },
  {
   "file": "demo/jewelry-scene2.webp",
   "width": 806,
   "height": 1000,
   "source_format": "WEBP",
   "source_bytes": 42222,
   "source_metadata_bytes": {}
  },
  {
   "file": "demo/jewelry-white.webp",
   "width": 1000,
   "height": 1000,
   "source_format": "WEBP",
   "source_bytes": 18266,
   "source_metadata_bytes": {}
  },
  {
   "file": "serum-ad.webp",
   "width": 1000,
   "height": 523,
   "source_format": "WEBP",
   "source_bytes": 8670,
   "source_metadata_bytes": {}
  },
  {
   "file": "serum-bathroom.webp",
   "width": 824,
   "height": 1000,
   "source_format": "WEBP",
   "source_bytes": 24424,
   "source_metadata_bytes": {}
  },
  {
   "file": "serum-color-beige.webp",
   "width": 800,
   "height": 800,
   "source_format": "WEBP",
   "source_bytes": 10702,
   "source_metadata_bytes": {}
  },
  {
   "file": "serum-color-navy.webp",
   "width": 800,
   "height": 800,
   "source_format": "WEBP",
   "source_bytes": 10530,
   "source_metadata_bytes": {}
  },
  {
   "file": "serum-color-peach.webp",
   "width": 800,
   "height": 800,
   "source_format": "WEBP",
   "source_bytes": 11878,
   "source_metadata_bytes": {}
  },
  {
   "file": "serum-color-sage.webp",
   "width": 800,
   "height": 800,
   "source_format": "WEBP",
   "source_bytes": 10758,
   "source_metadata_bytes": {}
  },
  {
   "file": "serum-luxury.webp",
   "width": 824,
   "height": 1000,
   "source_format": "WEBP",
   "source_bytes": 17900,
   "source_metadata_bytes": {}
  },
  {
   "file": "serum-marble.webp",
   "width": 824,
   "height": 1000,
   "source_format": "WEBP",
   "source_bytes": 18580,
   "source_metadata_bytes": {}
  },
  {
   "file": "serum-original.webp",
   "width": 824,
   "height": 1000,
   "source_format": "WEBP",
   "source_bytes": 14414,
   "source_metadata_bytes": {}
  },
  {
   "file": "serum-outdoors.webp",
   "width": 824,
   "height": 1000,
   "source_format": "WEBP",
   "source_bytes": 52198,
   "source_metadata_bytes": {}
  },
  {
   "file": "serum-pastel.webp",
   "width": 824,
   "height": 1000,
   "source_format": "WEBP",
   "source_bytes": 19612,
   "source_metadata_bytes": {}
  },
  {
   "file": "serum-story.webp",
   "width": 562,
   "height": 1000,
   "source_format": "WEBP",
   "source_bytes": 9708,
   "source_metadata_bytes": {}
  },
  {
   "file": "serum-white.webp",
   "width": 1000,
   "height": 1000,
   "source_format": "WEBP",
   "source_bytes": 13720,
   "source_metadata_bytes": {}
  },
  {
   "file": "serum-wood.webp",
   "width": 824,
   "height": 1000,
   "source_format": "WEBP",
   "source_bytes": 24920,
   "source_metadata_bytes": {}
  },
  {
   "file": "tools/edit-after.webp",
   "width": 876,
   "height": 1024,
   "source_format": "WEBP",
   "source_bytes": 26852,
   "source_metadata_bytes": {}
  },
  {
   "file": "tools/gen-bakery.webp",
   "width": 1024,
   "height": 1024,
   "source_format": "WEBP",
   "source_bytes": 118854,
   "source_metadata_bytes": {}
  },
  {
   "file": "tools/gen-mug.webp",
   "width": 1024,
   "height": 1024,
   "source_format": "WEBP",
   "source_bytes": 108338,
   "source_metadata_bytes": {}
  },
  {
   "file": "tools/gen-sneaker.webp",
   "width": 1024,
   "height": 1024,
   "source_format": "WEBP",
   "source_bytes": 40530,
   "source_metadata_bytes": {}
  },
  {
   "file": "tools/gen-wallet.webp",
   "width": 1024,
   "height": 1024,
   "source_format": "WEBP",
   "source_bytes": 314936,
   "source_metadata_bytes": {}
  },
  {
   "file": "tools/restore-after.webp",
   "width": 1024,
   "height": 1024,
   "source_format": "WEBP",
   "source_bytes": 146448,
   "source_metadata_bytes": {}
  },
  {
   "file": "tools/t2v-mug-poster.webp",
   "width": 960,
   "height": 540,
   "source_format": "WEBP",
   "source_bytes": 20014,
   "source_metadata_bytes": {}
  }
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    "q1": 67.198,
    "q3": 192.278,
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   "by_format": {
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