\u30aa\u30f3\u30e9\u30a4\u30f3JPEG\u5727\u7e2e\u30c4\u30fc\u30eb\u306f\u3069\u306e\u3088\u3046\u306b\u6a5f\u80fd\u3059\u308b\u306e\u304b\uff1f
\n\u30aa\u30f3\u30e9\u30a4\u30f3JPEG\u5727\u7e2e\u30c4\u30fc\u30eb\u306f\u3001\u30e6\u30fc\u30b6\u30fc\u304c\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u3057\u305fJPEG\u753b\u50cf\u3092\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u4e0a\u3067\u5727\u7e2e\u3059\u308b\u305f\u3081\u306e\u30b5\u30fc\u30d3\u30b9\u3067\u3059\u3002<\/p>\n
\u3053\u306e\u5727\u7e2e\u30d7\u30ed\u30bb\u30b9\u306f\u3001\u753b\u50cf\u306e\u753b\u8cea\u3092\u3067\u304d\u308b\u3060\u3051\u4fdd\u3061\u306a\u304c\u3089\u30d5\u30a1\u30a4\u30eb\u30b5\u30a4\u30ba\u3092\u5c0f\u3055\u304f\u3059\u308b\u3053\u3068\u3092\u76ee\u7684\u3068\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u4ee5\u4e0b\u306b\u3001\u305d\u306e\u4ed5\u7d44\u307f\u3068\u52b9\u679c\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n
\u57fa\u672c\u539f\u7406<\/p>\n
JPEG\u5727\u7e2e\u306e\u539f\u7406 <\/p>\n
JPEG\u306f\u4e0d\u53ef\u9006\u5727\u7e2e\u65b9\u5f0f\u3092\u63a1\u7528\u3057\u3066\u304a\u308a\u3001\u4eba\u9593\u306e\u76ee\u306b\u8a8d\u8b58\u3057\u306b\u304f\u3044\u60c5\u5831\u3092\u6368\u3066\u308b\u3053\u3068\u3067\u5727\u7e2e\u3092\u884c\u3044\u307e\u3059\u3002<\/p>\n
JPEG\u5727\u7e2e\u306f\u3001\u8272\u7a7a\u9593\u5909\u63db\uff08RGB\u304b\u3089YCbCr\u3078\u306e\u5909\u63db\uff09\u3001\u30af\u30ed\u30de\u30b5\u30d6\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u3001\u96e2\u6563\u30b3\u30b5\u30a4\u30f3\u5909\u63db\uff08DCT\uff09\u3001\u91cf\u5b50\u5316\u3001\u30a8\u30f3\u30c8\u30ed\u30d4\u30fc\u7b26\u53f7\u5316\u306a\u3069\u306e\u30b9\u30c6\u30c3\u30d7\u3092\u542b\u307f\u307e\u3059\u3002<\/p>\n
\u8272\u7a7a\u9593\u5909\u63db<\/p>\n
JPEG\u5727\u7e2e\u306f\u901a\u5e38\u3001RGB\u306e\u8272\u7a7a\u9593\u3092YCbCr\u306b\u5909\u63db\u3057\u307e\u3059\u3002<\/p>\n
\u3053\u3053\u3067Y\u306f\u8f1d\u5ea6\uff08\u660e\u308b\u3055\uff09\u3092\u8868\u3057\u3001Cb\u3068Cr\u306f\u8272\u5dee\u6210\u5206\u3092\u8868\u3057\u307e\u3059\u3002<\/p>\n
\u4eba\u306e\u76ee\u306f\u8f1d\u5ea6\u3092\u3088\u308a\u91cd\u8996\u3059\u308b\u305f\u3081\u3001\u8272\u5dee\u6210\u5206\u3092\u5727\u7e2e\u3057\u3066\u3082\u753b\u8cea\u3078\u306e\u5f71\u97ff\u306f\u5c11\u306a\u3044\u3067\u3059\u3002<\/p>\n
\u30af\u30ed\u30de\u30b5\u30d6\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0<\/p>\n
\u8272\u5dee\u6210\u5206\uff08Cb\u3068Cr\uff09\u306f\u8f1d\u5ea6\u3088\u308a\u3082\u7a7a\u9593\u7684\u306b\u4f4e\u3044\u89e3\u50cf\u5ea6\u3067\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u3055\u308c\u307e\u3059\u3002<\/p>\n
\u3053\u308c\u306b\u3088\u308a\u3001\u753b\u50cf\u306e\u30c7\u30fc\u30bf\u30b5\u30a4\u30ba\u304c\u6e1b\u5c11\u3057\u307e\u3059\u3002<\/p>\n
\u96e2\u6563\u30b3\u30b5\u30a4\u30f3\u5909\u63db\uff08DCT\uff09<\/p>\n
\u753b\u50cf\u3092\u5c0f\u3055\u306a\u30d6\u30ed\u30c3\u30af\uff08\u901a\u5e388×8\u30d4\u30af\u30bb\u30eb\uff09\u306b\u5206\u5272\u3057\u3001\u5404\u30d6\u30ed\u30c3\u30af\u306bDCT\u3092\u9069\u7528\u3057\u307e\u3059\u3002<\/p>\n
\u3053\u308c\u306b\u3088\u308a\u3001\u753b\u50cf\u30c7\u30fc\u30bf\u304c\u5468\u6ce2\u6570\u6210\u5206\u306b\u5909\u63db\u3055\u308c\u3001\u91cd\u8981\u5ea6\u306e\u4f4e\u3044\u5468\u6ce2\u6570\u6210\u5206\u3092\u5f8c\u3067\u6368\u3066\u308b\u3053\u3068\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
\u91cf\u5b50\u5316<\/p>\n
DCT\u306e\u7d50\u679c\u5f97\u3089\u308c\u305f\u30c7\u30fc\u30bf\u306f\u3001\u91cf\u5b50\u5316\u3068\u547c\u3070\u308c\u308b\u30d7\u30ed\u30bb\u30b9\u3067\u3055\u3089\u306b\u5727\u7e2e\u3055\u308c\u307e\u3059\u3002<\/p>\n
\u3053\u3053\u3067\u3001\u4e9b\u7d30\u306a\u60c5\u5831\u304c\u524a\u9664\u3055\u308c\u3001\u30c7\u30fc\u30bf\u30b5\u30a4\u30ba\u304c\u5927\u5e45\u306b\u7e2e\u5c0f\u3055\u308c\u307e\u3059\u3002<\/p>\n
\u30a8\u30f3\u30c8\u30ed\u30d4\u30fc\u7b26\u53f7\u5316<\/p>\n
\u6700\u5f8c\u306b\u3001\u91cf\u5b50\u5316\u3055\u308c\u305f\u30c7\u30fc\u30bf\u306b\u30cf\u30d5\u30de\u30f3\u7b26\u53f7\u5316\u306a\u3069\u306e\u30a8\u30f3\u30c8\u30ed\u30d4\u30fc\u7b26\u53f7\u5316\u3092\u884c\u3044\u3001\u3055\u3089\u306b\u5727\u7e2e\u7387\u3092\u9ad8\u3081\u307e\u3059\u3002<\/p>\n
\u30aa\u30f3\u30e9\u30a4\u30f3\u30c4\u30fc\u30eb\u3067\u306e\u5229\u7528\u30d7\u30ed\u30bb\u30b9<\/p>\n
\u30e6\u30fc\u30b6\u30fc\u304c\u753b\u50cf\u3092\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u3059\u308b\u3068\u3001\u30b5\u30fc\u30d0\u30fc\u5074\u3067\u4e0a\u8a18\u306e\u3088\u3046\u306a\u5727\u7e2e\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u304c\u5b9f\u884c\u3055\u308c\u307e\u3059\u3002<\/p>\n
\u5727\u7e2e\u5f8c\u306e\u753b\u50cf\u306f\u3001\u30e6\u30fc\u30b6\u30fc\u306b\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u30ea\u30f3\u30af\u3068\u3057\u3066\u63d0\u4f9b\u3055\u308c\u307e\u3059\u3002<\/p>\n
\u591a\u304f\u306e\u30aa\u30f3\u30e9\u30a4\u30f3\u30c4\u30fc\u30eb\u306f\u3001\u4e00\u62ec\u3067\u306e\u753b\u50cf\u5727\u7e2e\u3001\u5727\u7e2e\u5ea6\u306e\u8abf\u6574\u3001\u30d7\u30ec\u30d3\u30e5\u30fc\u6a5f\u80fd\u306a\u3069\u3082\u63d0\u4f9b\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u6839\u62e0<\/p>\n
JPEG\u898f\u683c JPEG\u5727\u7e2e\u306fISO\/IEC 10918-1\u304a\u3088\u3073ITU-T\u52e7\u544aT.81\u3067\u6a19\u6e96\u5316\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u3053\u306e\u6a19\u6e96\u5316\u3055\u308c\u305f\u30d7\u30ed\u30bb\u30b9\u306b\u57fa\u3065\u3044\u3066\u3001\u30aa\u30f3\u30e9\u30a4\u30f3\u30c4\u30fc\u30eb\u306fJPEG\u5727\u7e2e\u3092\u5b9f\u65bd\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u8996\u899a\u5fc3\u7406\u5b66 \u4eba\u9593\u306e\u8996\u899a\u7279\u6027\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u30d5\u30a1\u30a4\u30eb\u3092\u5c0f\u3055\u304f\u3057\u3066\u3082\u898b\u305f\u76ee\u4e0a\u306e\u8cea\u3092\u305d\u3053\u307e\u3067\u640d\u306a\u308f\u306a\u3044\u3068\u3044\u3046\u8003\u3048\u304c\u3001JPEG\u5727\u7e2e\u306e\u57fa\u672c\u306b\u3042\u308a\u307e\u3059\u3002<\/p>\n
\u6280\u8853\u5b9f\u88c5 \u30aa\u30fc\u30d7\u30f3\u30bd\u30fc\u30b9\u306e\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\uff08\u305f\u3068\u3048\u3070libjpeg\u3001mozjpeg\u306a\u3069\uff09\u306f\u3001JPEG\u5727\u7e2e\u306e\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3092\u5b9f\u88c5\u3057\u3066\u304a\u308a\u3001\u305d\u308c\u3092\u57fa\u306b\u591a\u304f\u306e\u30aa\u30f3\u30e9\u30a4\u30f3\u30c4\u30fc\u30eb\u304c\u6a5f\u80fd\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u3053\u308c\u3089\u306e\u30d7\u30ed\u30bb\u30b9\u3068\u6280\u8853\u306f\u3001\u753b\u50cf\u306e\u54c1\u8cea\u3068\u5727\u7e2e\u52b9\u7387\u306e\u30d0\u30e9\u30f3\u30b9\u3092\u53d6\u308b\u305f\u3081\u306b\u6700\u9069\u5316\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u30aa\u30f3\u30e9\u30a4\u30f3JPEG\u5727\u7e2e\u30c4\u30fc\u30eb\u306f\u3001\u3053\u306e\u30d7\u30ed\u30bb\u30b9\u3092\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u3092\u4ecb\u3057\u3066\u7c21\u5358\u306b\u5229\u7528\u3067\u304d\u308b\u3088\u3046\u306b\u3057\u3066\u304a\u308a\u3001\u305d\u306e\u5229\u4fbf\u6027\u304c\u652f\u6301\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u3069\u306e\u30aa\u30f3\u30e9\u30a4\u30f3\u30c4\u30fc\u30eb\u304c\u6700\u9ad8\u306eJPEG\u5727\u7e2e\u3092\u63d0\u4f9b\u3057\u3066\u3044\u308b\u306e\u304b\uff1f
\n\u30aa\u30f3\u30e9\u30a4\u30f3\u3067JPEG\u753b\u50cf\u3092\u5727\u7e2e\u3059\u308b\u305f\u3081\u306e\u30c4\u30fc\u30eb\u306f\u591a\u6570\u5b58\u5728\u3057\u3001\u305d\u308c\u305e\u308c\u7570\u306a\u308b\u7279\u5fb4\u3068\u5229\u70b9\u3092\u6301\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u4ee5\u4e0b\u306b\u3044\u304f\u3064\u304b\u306e\u77e5\u540d\u5ea6\u304c\u9ad8\u304f\u8a55\u5224\u306e\u826f\u3044\u30c4\u30fc\u30eb\u3068\u305d\u306e\u7279\u5fb4\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n
TinyPNG\/TinyJPG<\/p>\n
\u7279\u5fb4 \u975e\u5e38\u306b\u4f7f\u3044\u3084\u3059\u304f\u3001\u9ad8\u5727\u7e2e\u7387\u3067\u77e5\u3089\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u30d5\u30a1\u30a4\u30eb\u30b5\u30a4\u30ba\u3092\u524a\u6e1b\u3057\u3064\u3064\u753b\u8cea\u3092\u9ad8\u304f\u4fdd\u3064\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
\u6839\u62e0 Lossy\u5727\u7e2e\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3092\u4f7f\u7528\u3057\u3066\u304a\u308a\u3001\u30a6\u30a7\u30d6\u3067\u306e\u4f7f\u7528\u306b\u6700\u9069\u5316\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n
JPEGoptim<\/p>\n
\u7279\u5fb4 \u30aa\u30fc\u30d7\u30f3\u30bd\u30fc\u30b9\u306e\u30b3\u30de\u30f3\u30c9\u30e9\u30a4\u30f3\u30c4\u30fc\u30eb\u3067\u3059\u304c\u3001\u30aa\u30f3\u30e9\u30a4\u30f3\u30d0\u30fc\u30b8\u30e7\u30f3\u3082\u5229\u7528\u53ef\u80fd\u3067\u3059\u3002<\/p>\n
\u753b\u8cea\u3092\u7dad\u6301\u3057\u3064\u3064\u7121\u99c4\u306a\u30e1\u30bf\u30c7\u30fc\u30bf\u3092\u524a\u9664\u3059\u308b\u3053\u3068\u3067\u3001\u30d5\u30a1\u30a4\u30eb\u30b5\u30a4\u30ba\u3092\u524a\u6e1b\u3057\u307e\u3059\u3002<\/p>\n
\u6839\u62e0 \u7121\u6599\u3067\u4f7f\u7528\u3067\u304d\u3001\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u3084\u81ea\u52d5\u5316\u304c\u53ef\u80fd\u3067\u3059\u3002<\/p>\n
\u6280\u8853\u7684\u306a\u30e6\u30fc\u30b6\u30fc\u306b\u9069\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
Kraken.io<\/p>\n
\u7279\u5fb4 \u9ad8\u5ea6\u306a\u5727\u7e2e\u30aa\u30d7\u30b7\u30e7\u30f3\u3092\u63d0\u4f9b\u3057\u3001\u4e00\u62ec\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u3082\u53ef\u80fd\u3067\u3059\u3002<\/p>\n
\u30d7\u30ed\u3001\u30a8\u30f3\u30bf\u30fc\u30d7\u30e9\u30a4\u30ba\u5411\u3051\u30d7\u30e9\u30f3\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
\u6839\u62e0 API\u3092\u5229\u7528\u3057\u305f\u9ad8\u5ea6\u306a\u5727\u7e2e\u3068\u5229\u4fbf\u6027\u304c\u4f01\u696d\u30ec\u30d9\u30eb\u3067\u8a55\u4fa1\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n
Optimizilla<\/p>\n
\u7279\u5fb4 \u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u304c\u76f4\u611f\u7684\u3067\u4e00\u5ea6\u306b\u591a\u304f\u306e\u30d5\u30a1\u30a4\u30eb\u3092\u5727\u7e2e\u3067\u304d\u308b\u305f\u3081\u3001\u4f5c\u696d\u3092\u52b9\u7387\u5316\u3057\u307e\u3059\u3002<\/p>\n
\u30b9\u30e9\u30a4\u30c0\u30fc\u3067\u5727\u7e2e\u7387\u3092\u8abf\u6574\u53ef\u80fd\u3067\u3059\u3002<\/p>\n
\u6839\u62e0 \u753b\u8cea\u3092\u8996\u899a\u7684\u306b\u78ba\u8a8d\u3057\u306a\u304c\u3089\u6700\u9069\u306a\u5727\u7e2e\u7387\u3092\u898b\u3064\u3051\u3089\u308c\u308b\u70b9\u304c\u5229\u70b9\u3067\u3059\u3002<\/p>\n
Compressor.io<\/p>\n
\u7279\u5fb4 \u4ed6\u306e\u30d5\u30a1\u30a4\u30eb\u5f62\u5f0f\u306b\u3082\u5bfe\u5fdc\u3057\u3066\u304a\u308a\u3001JPEG\u4ee5\u5916\u3067\u3082\u5229\u7528\u53ef\u80fd\u3067\u3059\u3002<\/p>\n
\u591a\u6a5f\u80fd\u3067\u3042\u308a\u306a\u304c\u3089\u30b7\u30f3\u30d7\u30eb\u306a\u4f7f\u7528\u611f\u3002<\/p>\n
\u6839\u62e0 \u5727\u7e2e\u54c1\u8cea\u306e\u9078\u629e\u80a2\u304c\u591a\u69d8\u3067\u3001\u7528\u9014\u306b\u5fdc\u3058\u305f\u67d4\u8edf\u306a\u5727\u7e2e\u304c\u53ef\u80fd\u3067\u3059\u3002<\/p>\n
\u9078\u629e\u3059\u308b\u30c4\u30fc\u30eb\u306f\u3001\u4e3b\u306b\u5229\u7528\u30b7\u30fc\u30f3\u3084\u500b\u3005\u306e\u30e6\u30fc\u30b6\u30fc\u306e\u30cb\u30fc\u30ba\u306b\u4f9d\u5b58\u3057\u307e\u3059\u3002<\/p>\n
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