{
  "date": "2026-10-27",
  "method": {
    "ko": "직접 만든 2400×1600 사진 두 장(잎이 많은 사진, 매끈한 인물 느낌 사진)을 PNG로 넣고 실제 processImage로 JPG·WebP·AVIF를 화질 30~95까지 5 단위로, 목표 근처는 1 단위로 저장했습니다. 각 형식에서 JPG 85%의 SSIM(밝기 기준, 8×8 창)과 같거나 높게 나온 가장 작은 파일을 골랐습니다. 시간은 같은 설정으로 세 번 저장한 가운데 값이며, 처음 쓸 때 받는 처리용 파일 시간은 빠져 있습니다.",
    "en": "Two synthetic 2400×1600 photos (a leafy scene and a smooth portrait-like scene) went in as PNG and were saved through the shipped processImage as JPG, WebP and AVIF at quality 30–95 in steps of 5, then in steps of 1 near the match. For each format we picked the smallest file whose SSIM (luma, 8×8 windows) was at least that of JPG 85%. Time is the median of three saves at that setting and excludes the first-use processing file download.",
    "ja": "自作の2400×1600の写真2枚（葉の多い写真、なめらかな人物風の写真）をPNGで入れ、公開中のprocessImageでJPG・WebP・AVIFを画質30〜95まで5刻み、目標の近くは1刻みで保存しました。各形式で、JPG 85%のSSIM（明るさ基準・8×8の窓）以上になった一番小さいファイルを選びました。時間は同じ設定で3回保存した中央値で、初回に受信する処理用ファイルの時間は含みません。"
  },
  "table": {
    "ko": {
      "headers": [
        "사진 · 형식",
        "화질 숫자",
        "용량",
        "SSIM",
        "저장 시간"
      ],
      "rows": [
        [
          "잎 많은 사진 · JPG",
          "85%",
          "424.0 KB",
          "0.851",
          "0.7초"
        ],
        [
          "잎 많은 사진 · WebP",
          "79%",
          "314.8 KB",
          "0.854",
          "1.0초"
        ],
        [
          "잎 많은 사진 · AVIF",
          "62%",
          "299.5 KB",
          "0.852",
          "0.9초"
        ],
        [
          "매끈한 사진 · JPG",
          "85%",
          "40.4 KB",
          "0.992",
          "0.4초"
        ],
        [
          "매끈한 사진 · WebP",
          "80%",
          "19.7 KB",
          "0.992",
          "0.5초"
        ],
        [
          "매끈한 사진 · AVIF",
          "49%",
          "9.6 KB",
          "0.992",
          "0.7초"
        ]
      ]
    },
    "en": {
      "headers": [
        "Photo · format",
        "Quality number",
        "File size",
        "SSIM",
        "Save time"
      ],
      "rows": [
        [
          "Leafy · JPG",
          "85%",
          "424.0 KB",
          "0.851",
          "0.7 s"
        ],
        [
          "Leafy · WebP",
          "79%",
          "314.8 KB",
          "0.854",
          "1.0 s"
        ],
        [
          "Leafy · AVIF",
          "62%",
          "299.5 KB",
          "0.852",
          "0.9 s"
        ],
        [
          "Smooth · JPG",
          "85%",
          "40.4 KB",
          "0.992",
          "0.4 s"
        ],
        [
          "Smooth · WebP",
          "80%",
          "19.7 KB",
          "0.992",
          "0.5 s"
        ],
        [
          "Smooth · AVIF",
          "49%",
          "9.6 KB",
          "0.992",
          "0.7 s"
        ]
      ]
    },
    "ja": {
      "headers": [
        "写真・形式",
        "画質の数字",
        "容量",
        "SSIM",
        "保存時間"
      ],
      "rows": [
        [
          "葉の多い写真 · JPG",
          "85%",
          "424.0 KB",
          "0.851",
          "0.7秒"
        ],
        [
          "葉の多い写真 · WebP",
          "79%",
          "314.8 KB",
          "0.854",
          "1.0秒"
        ],
        [
          "葉の多い写真 · AVIF",
          "62%",
          "299.5 KB",
          "0.852",
          "0.9秒"
        ],
        [
          "なめらかな写真 · JPG",
          "85%",
          "40.4 KB",
          "0.992",
          "0.4秒"
        ],
        [
          "なめらかな写真 · WebP",
          "80%",
          "19.7 KB",
          "0.992",
          "0.5秒"
        ],
        [
          "なめらかな写真 · AVIF",
          "49%",
          "9.6 KB",
          "0.992",
          "0.7秒"
        ]
      ]
    }
  },
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      ],
      "matched": {
        "jpeg": {
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          "mirukitSimilarity": 0.9905508036224029,
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          "times": [
            378,
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            412
          ],
          "medianMs": 399
        },
        "webp": {
          "format": "webp",
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          "mirukitSimilarity": 0.9896490410128759,
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            480,
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          "medianMs": 484
        },
        "avif": {
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          "mirukitSimilarity": 0.9908584597742975,
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          "medianMs": 673
        }
      }
    },
    "metric": "luma SSIM 8x8 windows stride 4; target = JPG quality 85 of the same image",
    "userAgent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/156.0.0.0 Safari/537.36 Edg/156.0.0.0"
  },
  "figures": [
    {
      "file": {
        "ko": "batch2-avif-when-to-use-comparison-ko.webp",
        "en": "batch2-avif-when-to-use-comparison-en.webp",
        "ja": "batch2-avif-when-to-use-comparison-ja.webp"
      },
      "width": 1200,
      "height": {
        "ko": 911,
        "en": 911,
        "ja": 911
      },
      "alt": {
        "ko": "형식마다 JPG 85%와 같은 SSIM이 나온 가장 작은 파일을 같은 자리에서 잘라 2배로 키웠습니다.",
        "en": "For each format, the smallest file that matched JPG 85% on SSIM, cropped at the same spot and enlarged 2×.",
        "ja": "形式ごとに、JPG 85%と同じSSIMになった一番小さいファイルを同じ場所で切り出し、2倍に拡大しました。"
      },
      "caption": {
        "ko": "형식마다 JPG 85%와 같은 SSIM이 나온 가장 작은 파일을 같은 자리에서 잘라 2배로 키웠습니다.",
        "en": "For each format, the smallest file that matched JPG 85% on SSIM, cropped at the same spot and enlarged 2×.",
        "ja": "形式ごとに、JPG 85%と同じSSIMになった一番小さいファイルを同じ場所で切り出し、2倍に拡大しました。"
      }
    },
    {
      "file": {
        "ko": "batch2-avif-when-to-use-steps-ko.webp",
        "en": "batch2-avif-when-to-use-steps-en.webp",
        "ja": "batch2-avif-when-to-use-steps-ja.webp"
      },
      "width": 1200,
      "height": {
        "ko": 1800,
        "en": 1800,
        "ja": 1800
      },
      "alt": {
        "ko": "현재 도구에서 글의 설정을 실제로 적용한 화면입니다.",
        "en": "The current tool with the article’s settings actually applied.",
        "ja": "現在のツールで記事の設定を実際に適用した画面です。"
      },
      "caption": {
        "ko": "현재 도구에서 글의 설정을 실제로 적용한 화면입니다.",
        "en": "The current tool with the article’s settings actually applied.",
        "ja": "現在のツールで記事の設定を実際に適用した画面です。"
      }
    }
  ]
}