{"id":3595,"date":"2025-03-28T03:02:33","date_gmt":"2025-03-28T03:02:33","guid":{"rendered":"https:\/\/convertifypro.com\/?page_id=3595"},"modified":"2025-03-28T03:02:35","modified_gmt":"2025-03-28T03:02:35","slug":"lossless-vs-lossy-compression-explained","status":"publish","type":"page","link":"https:\/\/convertifypro.com\/ja\/%e5%8f%af%e9%80%86%e5%9c%a7%e7%b8%ae%e3%81%a8%e9%9d%9e%e5%8f%af%e9%80%86%e5%9c%a7%e7%b8%ae%e3%81%ae%e8%aa%ac%e6%98%8e\/","title":{"rendered":"\u53ef\u9006\u5727\u7e2e\u3068\u975e\u53ef\u9006\u5727\u7e2e\u306e\u8aac\u660e"},"content":{"rendered":"\n\n
\n \n
\n
<\/div>\n
\n

\u53ef\u9006\u5727\u7e2e\u3068\u975e\u53ef\u9006\u5727\u7e2e\u306e\u8aac\u660e: \u5b8c\u5168\u30ac\u30a4\u30c9<\/h1>\n

\u5727\u7e2e\u30bf\u30a4\u30d7\u306e\u57fa\u672c\u7684\u306a\u9055\u3044\u3001\u305d\u306e\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3001\u304a\u3088\u3073\u7279\u5b9a\u306e\u30cb\u30fc\u30ba\u306b\u9069\u3057\u305f\u3082\u306e\u3092\u9078\u629e\u3059\u308b\u65b9\u6cd5\u3092\u7406\u89e3\u3057\u307e\u3059\u3002<\/p>\n \n

\n
\n <\/i><\/span>\n \u30d5\u30a1\u30a4\u30eb\u30b5\u30a4\u30ba\u306e\u524a\u6e1b<\/span>\n <\/div>\n
\n <\/i><\/span>\n \u753b\u50cf\u5727\u7e2e<\/span>\n <\/div>\n
\n <\/i><\/span>\n \u30aa\u30fc\u30c7\u30a3\u30aa\u5727\u7e2e<\/span>\n <\/div>\n
\n <\/i><\/span>\n \u30d3\u30c7\u30aa\u5727\u7e2e<\/span>\n <\/div>\n <\/div>\n \n
\n \u5727\u7e2e\u30bf\u30a4\u30d7\u306e\u6bd4\u8f03<\/a>\n \u30d5\u30a1\u30a4\u30eb\u5f62\u5f0f\u306e\u8868\u793a<\/a>\n <\/div>\n <\/div>\n <\/section>\n \n \n
\n
\n

\u30c7\u30fc\u30bf\u5727\u7e2e\u306b\u3064\u3044\u3066<\/h2>\n
\n

\u30c7\u30fc\u30bf\u5727\u7e2e\u306f\u3001\u5197\u9577\u6027\u3092\u6392\u9664\u3057\u3001\u60c5\u5831\u3092\u518d\u69cb\u7bc9\u3059\u308b\u3053\u3068\u3067\u30d5\u30a1\u30a4\u30eb\u306e\u30b5\u30a4\u30ba\u3092\u524a\u6e1b\u3059\u308b\u3001\u30c7\u30b8\u30bf\u30eb \u30c6\u30af\u30ce\u30ed\u30b8\u30fc\u306e\u57fa\u672c\u7684\u306a\u6280\u8853\u3067\u3059\u3002\u30c7\u30b8\u30bf\u30eb\u4e16\u754c\u304c\u9ad8\u89e3\u50cf\u5ea6\u753b\u50cf\u30014K \u30d3\u30c7\u30aa\u3001\u8907\u96d1\u306a\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3067\u62e1\u5927\u3059\u308b\u306b\u3064\u308c\u3066\u3001\u30b9\u30c8\u30ec\u30fc\u30b8\u306e\u6700\u9069\u5316\u3001\u3088\u308a\u9ad8\u901f\u306a\u30c7\u30fc\u30bf\u8ee2\u9001\u3001\u5e2f\u57df\u5e45\u4f7f\u7528\u91cf\u306e\u524a\u6e1b\u306e\u305f\u3081\u306b\u3001\u52b9\u7387\u7684\u306a\u5727\u7e2e\u304c\u307e\u3059\u307e\u3059\u91cd\u8981\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n \n

\u5727\u7e2e\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306f\u3001\u6b21\u306e 2 \u3064\u306e\u4e3b\u8981\u306a\u30ab\u30c6\u30b4\u30ea\u306b\u5206\u985e\u3055\u308c\u307e\u3059\u3002 \u7121\u640d\u5931<\/strong> \u305d\u3057\u3066 \u640d\u5931\u306e\u3042\u308b<\/strong>\u3002\u3053\u308c\u3089\u306e\u30a2\u30d7\u30ed\u30fc\u30c1\u306e\u9055\u3044\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u306f\u3001\u3055\u307e\u3056\u307e\u306a\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3084\u696d\u754c\u306b\u308f\u305f\u3063\u3066\u30c7\u30b8\u30bf\u30eb \u30c7\u30fc\u30bf\u3092\u4fdd\u5b58\u3001\u9001\u4fe1\u3001\u64cd\u4f5c\u3059\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066\u60c5\u5831\u306b\u57fa\u3065\u3044\u305f\u610f\u601d\u6c7a\u5b9a\u3092\u884c\u3046\u305f\u3081\u306b\u4e0d\u53ef\u6b20\u3067\u3059\u3002<\/p>\n \n

\n
\n <\/i>\n <\/div>\n
\n

\u5727\u7e2e\u304c\u91cd\u8981\u306a\u7406\u7531<\/h3>\n

\u30c7\u30b8\u30bf\u30eb \u30b3\u30f3\u30c6\u30f3\u30c4\u306e\u7206\u767a\u7684\u306a\u5897\u52a0\u306b\u3088\u308a\u3001\u5727\u7e2e\u306e\u91cd\u8981\u6027\u304c\u3053\u308c\u307e\u3067\u4ee5\u4e0a\u306b\u9ad8\u307e\u3063\u3066\u3044\u307e\u3059\u3002\u643a\u5e2f\u96fb\u8a71\u306b 4K \u30d3\u30c7\u30aa\u3092\u914d\u4fe1\u3059\u308b\u30b9\u30c8\u30ea\u30fc\u30df\u30f3\u30b0 \u30b5\u30fc\u30d3\u30b9\u304b\u3089\u3001\u6570\u5341\u5104\u306e\u30d5\u30a1\u30a4\u30eb\u3092\u683c\u7d0d\u3059\u308b\u30af\u30e9\u30a6\u30c9 \u30b9\u30c8\u30ec\u30fc\u30b8 \u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u3001\u8907\u96d1\u306a\u30da\u30fc\u30b8\u3092\u6570\u30df\u30ea\u79d2\u3067\u8aad\u307f\u8fbc\u3080 Web \u30d6\u30e9\u30a6\u30b6\u306b\u81f3\u308b\u307e\u3067\u3001\u5727\u7e2e\u30c6\u30af\u30ce\u30ed\u30b8\u30fc\u306f\u30c7\u30b8\u30bf\u30eb\u4e16\u754c\u3092\u52b9\u7387\u7684\u306b\u6a5f\u80fd\u3055\u305b\u308b\u76ee\u306b\u898b\u3048\u306a\u3044\u529b\u3067\u3059\u3002<\/p>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/section>\n \n \n

\n

\u30ed\u30b9\u30ec\u30b9\u3068\u30ed\u30c3\u30b7\u30fc: \u4e3b\u306a\u9055\u3044<\/h2>\n \n
\n
\n
\n
\n <\/i>\n <\/div>\n

\u53ef\u9006\u5727\u7e2e<\/h3>\n

\u5143\u30c7\u30fc\u30bf\u306e\u5b8c\u5168\u306a\u518d\u69cb\u7bc9<\/p>\n <\/div>\n

\n
\n <\/i>\n <\/div>\n

\u975e\u53ef\u9006\u5727\u7e2e<\/h3>\n

\u8a31\u5bb9\u3067\u304d\u308b\u54c1\u8cea\u640d\u5931\u3092\u4f34\u3046\u30c7\u30fc\u30bf\u524a\u6e1b<\/p>\n <\/div>\n <\/div>\n \n

\n
\n <\/i>\n \u30c7\u30fc\u30bf\u306e\u6574\u5408\u6027<\/span>\n <\/div>\n
\n

\u4fdd\u5b58\u3059\u308b \u5143\u306e\u30c7\u30fc\u30bf\u306e 100%<\/strong>\u3002\u89e3\u51cd\u3059\u308b\u3068\u3001\u7d50\u679c\u306f\u30bd\u30fc\u30b9\u3068\u30d3\u30c3\u30c8\u3054\u3068\u306b\u540c\u4e00\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n <\/div>\n

\n

\u91cd\u8981\u5ea6\u304c\u4f4e\u3044\u3068\u601d\u308f\u308c\u308b\u30c7\u30fc\u30bf\u3092\u6c38\u4e45\u306b\u524a\u9664\u3057\u307e\u3059\u3002\u306e \u5143\u306e\u30d5\u30a1\u30a4\u30eb\u3092\u5b8c\u5168\u306b\u5fa9\u5143\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093<\/strong> \u5727\u7e2e\u5f8c\u3002<\/p>\n <\/div>\n <\/div>\n \n

\n
\n <\/i>\n \u5727\u7e2e\u7387<\/span>\n <\/div>\n
\n

\u901a\u5e38\u306f\u9054\u6210\u3057\u307e\u3059 2:1 \uff5e 5:1<\/strong> \u30c7\u30fc\u30bf\u578b\u306b\u5fdc\u3058\u305f\u5727\u7e2e\u7387\u3002\u3059\u3079\u3066\u306e\u60c5\u5831\u3092\u4fdd\u5b58\u3059\u308b\u3068\u3044\u3046\u8981\u4ef6\u306b\u3088\u3063\u3066\u5236\u9650\u3055\u308c\u307e\u3059\u3002<\/p>\n <\/div>\n

\n

\u591a\u304f\u306e\u5834\u5408\u3001\u306f\u308b\u304b\u306b\u9ad8\u3044\u6bd4\u7387\u3092\u9054\u6210\u3067\u304d\u307e\u3059 10:1 \uff5e 100:1<\/strong> \u307e\u305f\u306f\u3001\u300c\u77e5\u899a\u7684\u306b\u5197\u9577\u306a\u300d\u60c5\u5831\u3092\u7834\u68c4\u3059\u308b\u3053\u3068\u306b\u3088\u3063\u3066\u3002<\/p>\n <\/div>\n <\/div>\n \n

\n
\n <\/i>\n \u4e3b\u306a\u7528\u9014<\/span>\n <\/div>\n
\n

\u30c6\u30ad\u30b9\u30c8\u3001\u5b9f\u884c\u53ef\u80fd\u30d7\u30ed\u30b0\u30e9\u30e0\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u3001\u533b\u7642\u753b\u50cf\u3001\u30a2\u30fc\u30ab\u30a4\u30d6 \u30b9\u30c8\u30ec\u30fc\u30b8\u3001\u5c02\u9580\u7684\u306a\u30ef\u30fc\u30af\u30d5\u30ed\u30fc\u306a\u3069\u3001\u5b8c\u74a7\u306a\u518d\u69cb\u7bc9\u304c\u5fc5\u8981\u306a\u3082\u306e\u3059\u3079\u3066\u3002<\/p>\n <\/div>\n

\n

\u5199\u771f\u3001\u97f3\u697d\u3001\u30d3\u30c7\u30aa \u30b9\u30c8\u30ea\u30fc\u30df\u30f3\u30b0\u3001Web \u30b0\u30e9\u30d5\u30a3\u30c3\u30af\u30b9\u3001\u304a\u3088\u3073\u5b9f\u7528\u7684\u306a\u76ee\u7684\u3067\u591a\u5c11\u306e\u30c7\u30fc\u30bf\u640d\u5931\u304c\u8a31\u5bb9\u3055\u308c\u308b\u305d\u306e\u4ed6\u306e\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3002<\/p>\n <\/div>\n <\/div>\n \n

\n
\n <\/i>\n \u8907\u6570\u306e\u5727\u7e2e<\/span>\n <\/div>\n
\n

\u5727\u7e2e\u3068\u89e3\u51cd\u304c\u3067\u304d\u308b \u52a3\u5316\u3059\u308b\u3053\u3068\u306a\u304f\u4f55\u5ea6\u3067\u3082<\/strong>\u3002 100 \u56de\u76ee\u306e\u89e3\u51cd\u306f 1 \u56de\u76ee\u3068\u540c\u3058\u3067\u3059\u3002<\/p>\n <\/div>\n

\n

\u305d\u308c\u305e\u308c\u306e\u518d\u5727\u7e2e\u306b\u3088\u308a\u3001 \u8ffd\u52a0\u306e\u54c1\u8cea\u640d\u5931<\/strong>\u3002\u3053\u306e\u300c\u751f\u6210\u30ed\u30b9\u300d\u306f\u30b5\u30a4\u30af\u30eb\u3054\u3068\u306b\u84c4\u7a4d\u3055\u308c\u307e\u3059\u3002<\/p>\n <\/div>\n <\/div>\n \n

\n
\n <\/i>\n \u51e6\u7406\u8981\u4ef6<\/span>\n <\/div>\n
\n

\u4e00\u822c\u7684\u306b\u5fc5\u8981\u306a\u3082\u306e \u8a08\u7b97\u80fd\u529b\u304c\u4f4e\u3044<\/strong> \u9ad8\u5ea6\u306a\u975e\u53ef\u9006\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3068\u6bd4\u8f03\u3057\u305f\u30a8\u30f3\u30b3\u30fc\u30c9\/\u30c7\u30b3\u30fc\u30c9\u306e\u5834\u5408\u3002<\/p>\n <\/div>\n

\n

\u983b\u7e41\u306b\u5fc5\u8981\u3068\u306a\u308b \u3088\u308a\u591a\u304f\u306e\u8a08\u7b97\u30ea\u30bd\u30fc\u30b9<\/strong>\u3001\u7279\u306b\u30d3\u30c7\u30aa \u30b3\u30fc\u30c7\u30c3\u30af\u306a\u3069\u306e\u9ad8\u5ea6\u306a\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306e\u5834\u5408\u3002<\/p>\n <\/div>\n <\/div>\n <\/div>\n <\/section>\n \n \n

\n

\u53ef\u9006\u5727\u7e2e\u306e\u8aac\u660e<\/h2>\n \n
\n
\n
\n <\/i>\n <\/div>\n
\n

\u53ef\u9006\u5727\u7e2e\u3068\u306f\u4f55\u3067\u3059\u304b?<\/h3>\n

\u53ef\u9006\u5727\u7e2e\u306f\u3001\u60c5\u5831\u3092\u524a\u9664\u305b\u305a\u306b\u7d71\u8a08\u7684\u306a\u5197\u9577\u6027\u3092\u7279\u5b9a\u3057\u3066\u6392\u9664\u3059\u308b\u3053\u3068\u306b\u3088\u308a\u3001\u30d5\u30a1\u30a4\u30eb \u30b5\u30a4\u30ba\u3092\u524a\u6e1b\u3057\u307e\u3059\u3002\u89e3\u51cd\u3059\u308b\u3068\u3001\u30d5\u30a1\u30a4\u30eb\u306f\u5143\u306e\u30d5\u30a1\u30a4\u30eb\u3068\u30d3\u30c3\u30c8\u3054\u3068\u306b\u540c\u4e00\u306b\u306a\u308a\u3001\u54c1\u8cea\u3084\u30c7\u30fc\u30bf\u306e\u6574\u5408\u6027\u306f\u307e\u3063\u305f\u304f\u640d\u306a\u308f\u308c\u307e\u305b\u3093\u3002<\/p>\n <\/div>\n <\/div>\n \n

\u30ed\u30b9\u30ec\u30b9\u5727\u7e2e\u306e\u4ed5\u7d44\u307f<\/h3>\n

\u53ef\u9006\u5727\u7e2e\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306f\u3001\u3055\u307e\u3056\u307e\u306a\u6280\u8853\u3092\u4f7f\u7528\u3057\u3066\u3001\u5143\u306e\u30c7\u30fc\u30bf\u3092\u5b8c\u5168\u306b\u518d\u69cb\u7bc9\u3057\u306a\u304c\u3089\u30d5\u30a1\u30a4\u30eb \u30b5\u30a4\u30ba\u3092\u524a\u6e1b\u3057\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u65b9\u6cd5\u3067\u306f\u3001\u30c7\u30fc\u30bf\u5185\u306e\u30d1\u30bf\u30fc\u30f3\u3001\u983b\u5ea6\u3001\u69cb\u9020\u3092\u5206\u6790\u3057\u3066\u3001\u60c5\u5831\u3092\u5931\u308f\u305a\u306b\u30c7\u30fc\u30bf\u3092\u3088\u308a\u52b9\u7387\u7684\u306b\u30a8\u30f3\u30b3\u30fc\u30c9\u3057\u307e\u3059\u3002<\/p>\n \n

\n
\n
\n <\/i>\n <\/div>\n

\u30e9\u30f3\u30ec\u30f3\u30b0\u30b9\u30a8\u30f3\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0 (RLE)<\/h4>\n

RLE \u306f\u3001\u540c\u4e00\u306e\u30c7\u30fc\u30bf\u8981\u7d20 (\u30e9\u30f3) \u306e\u30b7\u30fc\u30b1\u30f3\u30b9\u3092\u5358\u4e00\u306e\u5024\u3068\u30ab\u30a6\u30f3\u30c8\u306b\u7f6e\u304d\u63db\u3048\u307e\u3059\u3002\u305f\u3068\u3048\u3070\u3001\u300cAAAAAABBBCCCCC\u300d\u306f\u300c6A3B5C\u300d\u306b\u306a\u308a\u3001\u7e70\u308a\u8fd4\u3057\u30b7\u30fc\u30b1\u30f3\u30b9\u304c\u591a\u3044\u30c7\u30fc\u30bf\u306e\u30b5\u30a4\u30ba\u304c\u5927\u5e45\u306b\u524a\u6e1b\u3055\u308c\u307e\u3059\u3002<\/p>\n

\n \u4f8b:<\/strong>\n 
Original: WWWWWWWWWWBBBWWWWWWWWWWWWBBBWWWWWWWWWW\nCompressed: 10W3B12W3B10W<\/pre>\n                    <\/div>\n                <\/div>\n                \n                
\n                    
\n                        <\/i>\n                    <\/div>\n                    
\u30cf\u30d5\u30de\u30f3\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0<\/h4>\n                    
\u3053\u306e\u624b\u6cd5\u3067\u306f\u3001\u5165\u529b\u6587\u5b57\u306b\u53ef\u5909\u9577\u30b3\u30fc\u30c9\u3092\u5272\u308a\u5f53\u3066\u3001\u983b\u7e41\u306b\u4f7f\u7528\u3055\u308c\u308b\u6587\u5b57\u306b\u306f\u77ed\u3044\u30b3\u30fc\u30c9\u3092\u5272\u308a\u5f53\u3066\u307e\u3059\u3002\u3053\u306e\u7d71\u8a08\u7684\u30a2\u30d7\u30ed\u30fc\u30c1\u306b\u3088\u308a\u3001\u6587\u5b57\u983b\u5ea6\u5206\u5e03\u306b\u57fa\u3065\u3044\u3066\u30a8\u30f3\u30b3\u30fc\u30c9\u304c\u6700\u9069\u5316\u3055\u308c\u307e\u3059\u3002<\/p>\n                    
\n                        \u4f8b:<\/strong>\n                        
Frequent character 'e': 101\nLess frequent 'z': 1010101011<\/pre>\n                    <\/div>\n                <\/div>\n                \n                
\n                    
\n                        <\/i>\n                    <\/div>\n                    
LZ77 \u304a\u3088\u3073 LZ78 \u30a2\u30eb\u30b4\u30ea\u30ba\u30e0<\/h4>\n                    
\u3053\u308c\u3089\u306e\u8f9e\u66f8\u30d9\u30fc\u30b9\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u7e70\u308a\u8fd4\u3057\u767a\u751f\u3059\u308b\u30c7\u30fc\u30bf\u3092\u3001\u975e\u5727\u7e2e\u30b9\u30c8\u30ea\u30fc\u30e0\u5185\u306b\u3059\u3067\u306b\u5b58\u5728\u3059\u308b\u5358\u4e00\u306e\u30b3\u30d4\u30fc\u3078\u306e\u53c2\u7167\u306b\u7f6e\u304d\u63db\u3048\u307e\u3059\u3002\u3053\u308c\u3089\u306f\u3001ZIP \u3084 GIF \u306a\u3069\u306e\u4e00\u822c\u7684\u306a\u5f62\u5f0f\u306e\u57fa\u790e\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n                    
\n                        \u4f8b:<\/strong>\n                        
Instead of storing \"compression compression\"\nStore \"compression [pointer to earlier instance]\"<\/pre>\n                    <\/div>\n                <\/div>\n                \n                
\n                    
\n                        <\/i>\n                    <\/div>\n                    
\u53ce\u7e2e\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0<\/h4>\n                    
LZ77 \u3068\u30cf\u30d5\u30de\u30f3 \u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u3092\u7d44\u307f\u5408\u308f\u305b\u305f Deflate \u306f\u3001\u9ad8\u901f\u3067\u512a\u308c\u305f\u5727\u7e2e\u3092\u5b9f\u73fe\u3057\u307e\u3059\u3002\u3053\u308c\u306f ZIP\u3001PNG\u3001HTTP \u5727\u7e2e (gzip) \u3067\u4f7f\u7528\u3055\u308c\u3001\u6700\u3082\u5e83\u304f\u5c0e\u5165\u3055\u308c\u3066\u3044\u308b\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306e 1 \u3064\u3067\u3059\u3002<\/p>\n                    
\n                        \u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3:<\/strong>\n