{"id":23729,"date":"2026-09-20T18:09:19","date_gmt":"2026-09-20T09:09:19","guid":{"rendered":"https:\/\/cg-method.com\/work-tools\/?p=23729"},"modified":"2026-10-24T21:15:11","modified_gmt":"2026-10-24T12:15:11","slug":"png-to-webp-conversion","status":"publish","type":"post","link":"https:\/\/cg-method.com\/work-tools\/png-to-webp-conversion\/","title":{"rendered":"PNG\u3092WebP\u306b\u5909\u63db\u3059\u308b\u3068\u304d\u306e\u6c7a\u3081\u65b9\uff5c\u53ef\u9006\u3068\u975e\u53ef\u9006\u3067\u3069\u308c\u3060\u3051\u5909\u308f\u308b\u304b\u6e2c\u3063\u305f"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">\u753b\u50cf\u3092WebP\u306b\u3059\u308b\u3068\u8efd\u304f\u306a\u308b\u3068\u8a00\u308f\u308c\u308b\u304c\u3001\u3069\u308c\u3060\u3051\u5c0f\u3055\u304f\u306a\u308b\u304b\u306f\u8a2d\u5b9a\u3068\u753b\u50cf\u306e\u4e2d\u8eab\u3067\u5909\u308f\u308b\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5909\u63db\u306e\u65b9\u5f0f\u306b\u306f\u3001\u5143\u306e\u753b\u7d20\u3092\u305d\u306e\u307e\u307e\u4fdd\u3064\u3082\u306e\u3068\u3001\u60c5\u5831\u3092\u6368\u3066\u3066\u5c0f\u3055\u304f\u3059\u308b\u3082\u306e\u304c\u3042\u308b\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u3053\u3067\u306f\u3001\u5b9f\u969b\u306b\u624b\u5143\u3067\u5909\u63db\u3057\u3066\u6e2c\u3063\u305f\u6570\u5024\u3092\u3082\u3068\u306b\u3001\u3069\u3061\u3089\u3092\u9078\u3076\u304b\u306e\u8003\u3048\u65b9\u3092\u6574\u7406\u3059\u308b\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6e2c\u5b9a\u306f2026\u5e749\u670820\u65e5\u306bPython 3.13\u3068Pillow 12.3.0\u3067\u5b9f\u884c\u3057\u305f\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u5b9f\u969b\u306b\u6e2c\u3063\u305f\u6570\u5024<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u540c\u3058\u753b\u50cf\u3092PNG\u3068WebP\u3067\u4fdd\u5b58\u3057\u3001\u5927\u304d\u3055\u3068\u3001\u5143\u306e\u753b\u7d20\u3068\u306e\u5dee\u3092\u6bd4\u3079\u305f\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">1\u679a\u76ee\u306f\u6587\u5b57\u3068\u5358\u8272\u306e\u9762\u304c\u591a\u3044\u753b\u50cf\uff081280\u00d7720\uff09\u3067\u3042\u308b\u3002<\/p>\n\n\n\n<figure class=\"wp-block-table is-style-regular\"><table class=\"has-fixed-layout\"><thead><tr><th style=\"min-width:8em !important\">\u4fdd\u5b58\u306e\u4ed5\u65b9<\/th><th>\u5927\u304d\u3055<\/th><th>PNG\u6bd4<\/th><th>\u5143\u3068\u4e00\u81f4<\/th><th>\u753b\u7d20\u306e\u5e73\u5747\u5dee<\/th><th>\u6700\u5927\u5dee<\/th><\/tr><\/thead><tbody><tr><td>PNG<\/td><td>82,785 \u30d0\u30a4\u30c8<\/td><td>100%<\/td><td>\u2014<\/td><td>\u2014<\/td><td>\u2014<\/td><\/tr><tr><td>WebP \u53ef\u9006<\/td><td>45,614 \u30d0\u30a4\u30c8<\/td><td>55.1%<\/td><td>\u4e00\u81f4\u3059\u308b<\/td><td>0<\/td><td>0<\/td><\/tr><tr><td>WebP \u54c1\u8cea90<\/td><td>14,908 \u30d0\u30a4\u30c8<\/td><td>18.0%<\/td><td>\u4e00\u81f4\u3057\u306a\u3044<\/td><td>1.08<\/td><td>19<\/td><\/tr><tr><td>WebP \u54c1\u8cea80<\/td><td>10,986 \u30d0\u30a4\u30c8<\/td><td>13.3%<\/td><td>\u4e00\u81f4\u3057\u306a\u3044<\/td><td>1.14<\/td><td>35<\/td><\/tr><tr><td>WebP \u54c1\u8cea75<\/td><td>9,700 \u30d0\u30a4\u30c8<\/td><td>11.7%<\/td><td>\u4e00\u81f4\u3057\u306a\u3044<\/td><td>1.17<\/td><td>38<\/td><\/tr><\/tbody><\/table><figcaption class=\"wp-element-caption\">\u6587\u5b57\u3068\u5358\u8272\u306e\u9762\u304c\u591a\u3044\u753b\u50cf\u3067\u306e\u5b9f\u6e2c\uff082026\u5e749\u670820\u65e5\uff09<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">2\u679a\u76ee\u306f\u5225\u306e\u56f3\u7248\uff081280\u00d7720\uff09\u3067\u3001\u50be\u5411\u306f\u540c\u3058\u3060\u3063\u305f\u3002<\/p>\n\n\n\n<figure class=\"wp-block-table is-style-regular\"><table class=\"has-fixed-layout\"><thead><tr><th style=\"min-width:8em !important\">\u4fdd\u5b58\u306e\u4ed5\u65b9<\/th><th>\u5927\u304d\u3055<\/th><th>PNG\u6bd4<\/th><th>\u753b\u7d20\u306e\u5e73\u5747\u5dee<\/th><th>\u6700\u5927\u5dee<\/th><\/tr><\/thead><tbody><tr><td>PNG<\/td><td>91,319 \u30d0\u30a4\u30c8<\/td><td>100%<\/td><td>\u2014<\/td><td>\u2014<\/td><\/tr><tr><td>WebP \u53ef\u9006<\/td><td>51,652 \u30d0\u30a4\u30c8<\/td><td>56.6%<\/td><td>0<\/td><td>0<\/td><\/tr><tr><td>WebP \u54c1\u8cea90<\/td><td>15,454 \u30d0\u30a4\u30c8<\/td><td>16.9%<\/td><td>0.99<\/td><td>16<\/td><\/tr><tr><td>WebP \u54c1\u8cea80<\/td><td>11,356 \u30d0\u30a4\u30c8<\/td><td>12.4%<\/td><td>1.07<\/td><td>23<\/td><\/tr><tr><td>WebP \u54c1\u8cea75<\/td><td>9,966 \u30d0\u30a4\u30c8<\/td><td>10.9%<\/td><td>1.10<\/td><td>31<\/td><\/tr><\/tbody><\/table><figcaption class=\"wp-element-caption\">\u5225\u306e\u56f3\u7248\u3067\u306e\u5b9f\u6e2c\uff082026\u5e749\u670820\u65e5\uff09<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u5e73\u5747\u5dee\u3068\u6700\u5927\u5dee\u306f\u30010\u304b\u3089255\u307e\u3067\u306e\u5024\u3068\u3057\u3066\u306e\u5dee\u3067\u3042\u308b\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5e73\u5747\u304c1\u524d\u5f8c\u3067\u3082\u6700\u5927\u304c30\u3092\u8d85\u3048\u308b\u7b87\u6240\u304c\u3042\u308a\u3001\u5dee\u306f\u753b\u50cf\u5168\u4f53\u306b\u5747\u7b49\u3067\u306f\u306a\u3044\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">2\u3064\u306e\u65b9\u5f0f\u306e\u9055\u3044<\/h2>\n\n\n\n<figure class=\"wp-block-table is-style-regular\"><table class=\"has-fixed-layout\"><thead><tr><th style=\"min-width:8em !important\">\u65b9\u5f0f<\/th><th>\u753b\u7d20<\/th><th>\u5c0f\u3055\u3055<\/th><th>\u5411\u3044\u3066\u3044\u308b\u753b\u50cf<\/th><\/tr><\/thead><tbody><tr><td>\u53ef\u9006<\/td><td>\u5bfe\u5fdc\u3059\u308b\u753b\u7d20\u3092\u4fdd\u6301\uff08\u900f\u660e\u90e8\u5206\u306eRGB\u306f\u8a2d\u5b9a\u3092\u78ba\u8a8d\uff09<\/td><td>\u3053\u306e2\u679a\u3067\u306fPNG\u306e\u7d0455%<\/td><td>\u56f3\u7248\u3001\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8\u3001\u900f\u904e\u304c\u8981\u308b\u3082\u306e<\/td><\/tr><tr><td>\u975e\u53ef\u9006<\/td><td>\u8a2d\u5b9a\u3068\u753b\u50cf\u306b\u3088\u3063\u3066\u753b\u7d20\u304c\u5909\u308f\u308b<\/td><td>\u3053\u306e2\u679a\u3067\u306fPNG\u306e1\u301c2\u5272<\/td><td>\u5199\u771f\u3001\u7d30\u304b\u3044\u968e\u8abf\u304c\u591a\u3044\u3082\u306e<\/td><\/tr><\/tbody><\/table><figcaption class=\"wp-element-caption\">\u65b9\u5f0f\u306b\u3088\u308b\u9055\u3044<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">9\u670820\u65e5\u306e2\u679a\u3067\u306f\u3001\u53ef\u9006\u3067PNG\u306e\u534a\u5206\u7a0b\u5ea6\u306b\u306a\u3063\u305f\u3002\u305f\u3060\u3057\u753b\u50cf\u3084\u30e1\u30bf\u30c7\u30fc\u30bf\u306b\u3088\u3063\u3066\u5927\u304d\u304f\u306a\u308b\u5834\u5408\u3082\u3042\u308b\u305f\u3081\u3001\u51fa\u529b\u30b5\u30a4\u30ba\u3092\u78ba\u8a8d\u3059\u308b\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u306e2\u679a\u3067\u306f\u975e\u53ef\u9006\u30671\u5272\u53f0\u306b\u306a\u3063\u305f\u304c\u3001\u3059\u3079\u3066\u306e\u753b\u50cf\u3067\u540c\u3058\u6bd4\u7387\u306b\u306a\u308b\u308f\u3051\u3067\u306f\u306a\u3044\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u306e\u5dee\u3092\u3069\u3046\u53d7\u3051\u53d6\u308b\u304b\u306f\u3001\u305d\u306e\u753b\u50cf\u304c\u4f55\u306b\u4f7f\u308f\u308c\u308b\u304b\u3067\u5909\u308f\u308b\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u3069\u3061\u3089\u3092\u9078\u3076\u304b\u306e\u6c7a\u3081\u65b9<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u753b\u50cf\u306e\u4e2d\u8eab\u3088\u308a\u5148\u306b\u3001\u305d\u306e\u753b\u50cf\u306b\u6c42\u3081\u308b\u6027\u8cea\u3092\u6c7a\u3081\u308b\u307b\u3046\u304c\u65e9\u3044\u3002<\/p>\n\n\n\n<figure class=\"wp-block-table is-style-regular\"><table class=\"has-fixed-layout\"><thead><tr><th style=\"min-width:8em !important\">\u6c42\u3081\u308b\u6027\u8cea<\/th><th>\u9078\u3076\u65b9\u5f0f<\/th><th>\u7406\u7531<\/th><\/tr><\/thead><tbody><tr><td>\u6587\u5b57\u304c\u306b\u3058\u3093\u3067\u306f\u56f0\u308b<\/td><td>\u53ef\u9006<\/td><td>\u975e\u53ef\u9006\u306f\u8f2a\u90ed\u306e\u5468\u308a\u306b\u5dee\u304c\u51fa\u308b<\/td><\/tr><tr><td>\u8272\u3092\u6b63\u78ba\u306b\u4f1d\u3048\u305f\u3044<\/td><td>\u53ef\u9006<\/td><td>\u753b\u7d20\u306b\u52a0\u3048ICC\u306e\u4fdd\u6301\u3068\u8868\u793a\u74b0\u5883\u3082\u78ba\u8a8d\u3059\u308b<\/td><\/tr><tr><td>\u8aad\u307f\u8fbc\u307f\u3092\u8efd\u304f\u3057\u305f\u3044<\/td><td>\u975e\u53ef\u9006<\/td><td>\u3053\u306e2\u679a\u3067\u306f1\u5272\u53f0\u3002\u5fc5\u305a\u5c0f\u3055\u304f\u306a\u308b\u308f\u3051\u3067\u306f\u306a\u3044<\/td><\/tr><tr><td>\u5143\u753b\u50cf\u3068\u3057\u3066\u4fdd\u7ba1\u3059\u308b<\/td><td>\u53ef\u9006\u307e\u305f\u306fPNG\u306e\u307e\u307e<\/td><td>\u3042\u3068\u304b\u3089\u4f5c\u308a\u76f4\u305b\u308b<\/td><\/tr><tr><td>\u900f\u904e\u304c\u8981\u308b<\/td><td>\u3069\u3061\u3089\u3082\u53ef<\/td><td>WebP\u306f\u900f\u904e\u306b\u5bfe\u5fdc\u3057\u3066\u3044\u308b<\/td><\/tr><\/tbody><\/table><figcaption class=\"wp-element-caption\">\u6c42\u3081\u308b\u6027\u8cea\u304b\u3089\u65b9\u5f0f\u3092\u6c7a\u3081\u308b<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8\u3084\u56f3\u7248\u3067\u6587\u5b57\u304c\u5165\u3063\u3066\u3044\u308b\u3082\u306e\u306f\u3001\u975e\u53ef\u9006\u306b\u3059\u308b\u3068\u8f2a\u90ed\u306e\u5468\u308a\u306b\u5dee\u304c\u51fa\u3084\u3059\u3044\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5b9f\u6e2c\u3067\u3082\u3001\u6587\u5b57\u3068\u5358\u8272\u306e\u9762\u304c\u591a\u3044\u753b\u50cf\u306e\u307b\u3046\u304c\u6700\u5927\u5dee\u304c\u5927\u304d\u304b\u3063\u305f\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u30aa\u30f3\u30e9\u30a4\u30f3\u306e\u5909\u63db\u3092\u4f7f\u3046\u3068\u304d\u306b\u898b\u308b\u3068\u3053\u308d<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u30d6\u30e9\u30a6\u30b6\u30fc\u3067\u5909\u63db\u3067\u304d\u308b\u30b5\u30fc\u30d3\u30b9\u306f\u591a\u3044\u304c\u3001\u78ba\u304b\u3081\u3066\u304a\u304d\u305f\u3044\u70b9\u304c\u3044\u304f\u3064\u304b\u3042\u308b\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n\n<li>\u53ef\u9006\u3068\u975e\u53ef\u9006\u3092\u9078\u3079\u308b\u304b\uff08\u9078\u3079\u306a\u3044\u5834\u5408\u306f\u5b9f\u969b\u306e\u51fa\u529b\u65b9\u5f0f\u3092\u4ed5\u69d8\u3067\u78ba\u8a8d\u3059\u308b\uff09<\/li>\n\n\n<li>\u54c1\u8cea\u306e\u6570\u5024\u3092\u6307\u5b9a\u3067\u304d\u308b\u304b<\/li>\n\n\n<li>\u5143\u306e\u30d5\u30a1\u30a4\u30eb\u304c\u3069\u3053\u3078\u9001\u3089\u308c\u308b\u304b\uff08\u624b\u5143\u3067\u51e6\u7406\u3059\u308b\u3082\u306e\u3068\u3001\u9001\u4fe1\u3059\u308b\u3082\u306e\u304c\u3042\u308b\uff09<\/li>\n\n\n<li>\u5909\u63db\u5f8c\u306b\u30b5\u30a4\u30ba\u3092\u78ba\u304b\u3081\u3089\u308c\u308b\u304b<\/li>\n\n\n<li>\u900f\u904e\u304c\u6b8b\u308b\u304b<\/li>\n\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u516c\u958b\u524d\u306e\u8cc7\u6599\u3084\u3001\u4ed6\u4eba\u304b\u3089\u9810\u304b\u3063\u305f\u753b\u50cf\u3092\u6271\u3046\u5834\u5408\u306f\u3001\u9001\u4fe1\u306e\u6709\u7121\u3092\u5148\u306b\u78ba\u304b\u3081\u308b\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u300c\u30d6\u30e9\u30a6\u30b6\u30fc\u5185\u3067\u51e6\u7406\u300d\u3068\u3044\u3046\u8868\u793a\u3060\u3051\u3067\u9001\u4fe1\u304c\u306a\u3044\u3068\u65ad\u5b9a\u305b\u305a\u3001\u30c7\u30fc\u30bf\u306e\u6271\u3044\u3068\u901a\u4fe1\u4ed5\u69d8\u3092\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u624b\u5143\u3067\u5909\u63db\u3059\u308b<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u540c\u3058\u8a2d\u5b9a\u3067\u4f55\u679a\u3082\u5909\u63db\u3059\u308b\u306a\u3089\u3001\u30ed\u30fc\u30ab\u30eb\u3067\u4e00\u62ec\u51e6\u7406\u3059\u308b\u65b9\u6cd5\u304c\u3042\u308a\u307e\u3059\u3002\u51e6\u7406\u901f\u5ea6\u306fPC\u3084\u8a2d\u5b9a\u306b\u3088\u3063\u3066\u7570\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Python\u306ePillow\u3092\u4f7f\u3046\u5834\u5408\u306f\u3053\u3046\u66f8\u3051\u308b\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-python\"><code>from pathlib import Path\nfrom PIL import Image, features\n\nsource = Path(&quot;png-source&quot;).resolve(strict=True)\noutput = source.parent \/ &quot;webp-new&quot;\nif output.exists():\n    raise FileExistsError(output)\nif not features.check(&quot;webp&quot;):\n    raise RuntimeError(&quot;Pillow\u306bWebP\u5bfe\u5fdc\u304c\u5fc5\u8981\u3067\u3059&quot;)\nfiles = sorted(source.glob(&quot;*.png&quot;))\nif not files:\n    raise ValueError(&quot;PNG\u304c\u3042\u308a\u307e\u305b\u3093&quot;)\n# \u5168\u5165\u529b\u3092\u5148\u306b\u78ba\u8a8d\u3002\u901a\u5e38\u306e8bit RGB\/RGBA\u30fb\u9759\u6b62\u753b\u304c\u5bfe\u8c61\u3002\nfor src in files:\n    if src.is_symlink() or src.read_bytes()[24] != 8:\n        raise ValueError(f&quot;\u5bfe\u8c61\u5916\u306ePNG: {src.name}&quot;)\n    with Image.open(src) as im:\n        if im.format != &quot;PNG&quot; or im.mode not in (&quot;RGB&quot;, &quot;RGBA&quot;) or getattr(im, &quot;n_frames&quot;, 1) != 1:\n            raise ValueError(f&quot;\u5bfe\u8c61\u5916\u306ePNG: {src.name}&quot;)\n        im.load()\noutput.mkdir()\nfor src in files:\n    with Image.open(src) as im:\n        options = {k: im.info[k] for k in (&quot;icc_profile&quot;, &quot;exif&quot;) if k in im.info}\n        dest = output \/ (src.stem + &quot;.webp&quot;)\n        with dest.open(&quot;xb&quot;) as stream:\n            im.save(stream, &quot;WEBP&quot;, lossless=True, exact=True, **options)\n        print(src.name, src.stat().st_size, dest.stat().st_size)\n<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u5909\u63db\u3057\u305f\u3042\u3068\u3001\u5143\u3068\u4e00\u81f4\u3057\u3066\u3044\u308b\u304b\u3092\u78ba\u304b\u3081\u305f\u3044\u5834\u5408\u306f\u6b21\u306e\u3088\u3046\u306b\u3059\u308b\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-python\"><code>from PIL import Image, ImageChops, ImageStat\n\nwith Image.open(&quot;png-source\/alpha.png&quot;) as original, Image.open(&quot;webp-new\/alpha.webp&quot;) as converted:\n    a, b = original.convert(&quot;RGBA&quot;), converted.convert(&quot;RGBA&quot;)\n    if a.size != b.size:\n        raise ValueError(&quot;\u5bf8\u6cd5\u304c\u9055\u3044\u307e\u3059&quot;)\n    d = ImageChops.difference(a, b)\n    extrema = [band.getextrema() for band in d.split()]\n    print(&quot;RGBA\u5168\u30c1\u30e3\u30f3\u30cd\u30eb\u4e00\u81f4:&quot;, all(high == 0 for low, high in extrema))\n    print(&quot;R\/G\/B\/A\u306e\u5e73\u5747\u5dee:&quot;, ImageStat.Stat(d).mean)\n<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">RGBA\u306e\u5dee\u3092getbbox()\u306e\u6a19\u6e96\u8a2d\u5b9a\u3060\u3051\u3067\u8abf\u3079\u308b\u3068\u3001RGB\u306e\u5dee\u3092\u898b\u843d\u3068\u3059\u5834\u5408\u304c\u3042\u308b\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6539\u8a02\u3057\u305f\u6bd4\u8f03\u4f8b\u3067\u306f\u5dee\u5206\u3092R\u30fbG\u30fbB\u30fbA\u306e4\u30d0\u30f3\u30c9\u306b\u5206\u3051\u3001\u5404\u30d0\u30f3\u30c9\u306e\u6700\u5927\u5024\u3092\u78ba\u8a8d\u3059\u308b\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u900f\u904e\u753b\u50cf\u3067\u306fRGB\u3060\u3051\u3067\u6bd4\u8f03\u3059\u308b\u3068\u900f\u660e\u5ea6\u306e\u5909\u5316\u3092\u898b\u843d\u3068\u3059\u305f\u3081\u3001\u30a2\u30eb\u30d5\u30a1\u3082\u6bd4\u8f03\u3059\u308b\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u7f6e\u304d\u63db\u3048\u308b\u3068\u304d\u306b\u6c17\u3092\u3064\u3051\u308b\u3053\u3068<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n\n<li>\u5143\u306ePNG\u3092\u6d88\u3059\u524d\u306b\u3001\u5909\u63db\u5f8c\u306e\u898b\u305f\u76ee\u3092\u5b9f\u969b\u306b\u958b\u3044\u3066\u78ba\u304b\u3081\u308b<\/li>\n\n\n<li>\u5dee\u3057\u66ff\u3048\u308b\u306a\u3089URL\u3082\u5909\u308f\u308b\u305f\u3081\u3001\u53c2\u7167\u3057\u3066\u3044\u308b\u5834\u6240\u3092\u3059\u3079\u3066\u76f4\u3059<\/li>\n\n\n<li>\u5370\u5237\u3084\u518d\u7de8\u96c6\u306b\u4f7f\u3046\u5143\u30c7\u30fc\u30bf\u306f\u3001PNG\u306e\u307e\u307e\u6b8b\u3057\u3066\u304a\u304f<\/li>\n\n\n<li>\u540c\u3058\u8a2d\u5b9a\u3067\u5168\u90e8\u3092\u5909\u63db\u305b\u305a\u3001\u6587\u5b57\u306e\u591a\u3044\u753b\u50cf\u3060\u3051\u53ef\u9006\u306b\u3059\u308b\u306a\u3069\u5206\u3051\u308b<\/li>\n\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u5bb9\u91cf\u3092\u524a\u308b\u3053\u3068\u3060\u3051\u3092\u76ee\u7684\u306b\u3059\u308b\u3068\u3001\u3042\u3068\u304b\u3089\u4f5c\u308a\u76f4\u305b\u306a\u3044\u753b\u50cf\u3092\u975e\u53ef\u9006\u306b\u3057\u3066\u3057\u307e\u3046\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u900f\u660e\u90e8\u5206\u306e\u753b\u7d20\u3068\u4e0a\u66f8\u304d\u3092\u78ba\u8a8d\u3059\u308b\u7df4\u7fd2<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/cg-method.com\/work-tools\/wp-content\/uploads\/2026\/10\/cgm-file-format-practice-20261002.zip\">\u7df4\u7fd2\u7528PDF\u30fbPNG\u30fb\u691c\u8a3c\u30b9\u30af\u30ea\u30d7\u30c8\u3092\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\uff08ZIP\uff09<\/a>\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">2026\u5e7410\u67082\u65e5\u306b\u4f5c\u3063\u305f\u67b6\u7a7a\u306e\u6587\u5b57\u3068\u6a21\u69d8\u3067\u3001\u500b\u4eba\u60c5\u5831\u3084\u5b9f\u52d9\u306e\u8cc7\u6599\u306f\u542b\u307f\u307e\u305b\u3093\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Python\u3068WebP\u5bfe\u5fdc\u306ePillow\u304c\u5c0e\u5165\u6e08\u307f\u3067\u3042\u308b\u3053\u3068\u3092\u524d\u63d0\u306b\u3001\u5c55\u958b\u5148\u3067convert-webp.py\u3092\u5b9f\u884c\u3057\u3001\u7d9a\u3051\u3066compare-webp.py\u3092\u5b9f\u884c\u3059\u308b\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u672a\u4f5c\u6210\u306ewebp-new\u3078\u51fa\u529b\u3057\u3001\u5143PNG\u3092\u6b8b\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5bfe\u8c61\u306f8bit RGB\/RGBA\u306e\u9759\u6b62PNG\u3067\u300116bit\u3084\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3PNG\u306f\u51e6\u7406\u524d\u306b\u62d2\u5426\u3059\u308b\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">lossless=True\u3060\u3051\u3067\u306f\u3001\u5b8c\u5168\u306b\u900f\u660e\u306a\u753b\u7d20\u306eRGB\u5024\u3092\u4fdd\u6301\u3057\u306a\u3044\u5834\u5408\u304c\u3042\u308b\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">exact=True\u3092\u52a0\u3048\u3001ICC\u30d7\u30ed\u30d5\u30a1\u30a4\u30eb\u3068EXIF\u304c\u3042\u308c\u3070\u6e21\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">PNG\u56fa\u6709\u306e\u6587\u5b57\u30c1\u30e3\u30f3\u30af\u306a\u3069\u3059\u3079\u3066\u306e\u4ed8\u968f\u60c5\u5831\u3092\u4fdd\u6301\u3059\u308b\u4f8b\u3067\u306f\u306a\u3044\u305f\u3081\u3001\u5143PNG\u3082\u4fdd\u7ba1\u3059\u308b\u3002<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th style=\"min-width:8em !important\">2026\u5e7410\u67082\u65e5\u306e\u7df4\u7fd2\u7528\u5165\u529b<\/th><th style=\"min-width:8em !important\">PNG<\/th><th style=\"min-width:8em !important\">\u53ef\u9006WebP<\/th><th style=\"min-width:8em !important\">\u78ba\u8a8d\u7d50\u679c<\/th><\/tr><\/thead><tbody><tr><td>\u900f\u660e\u5ea6\u3068sRGB\u30d7\u30ed\u30d5\u30a1\u30a4\u30eb\u3092\u6301\u3064alpha.png<\/td><td>574\u30d0\u30a4\u30c8<\/td><td>800\u30d0\u30a4\u30c8<\/td><td>RGBA\u306e\u5168\u753b\u7d20\u3001ICC\u3001EXIF\u306e\u5411\u304d\u304c\u4e00\u81f4<\/td><\/tr><tr><td>\u5358\u8272\u306eopaque.png<\/td><td>77\u30d0\u30a4\u30c8<\/td><td>38\u30d0\u30a4\u30c8<\/td><td>RGBA\u3078\u5c55\u958b\u3057\u305f\u5168\u753b\u7d20\u304c\u4e00\u81f4<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Python 3.12.14\u30fbPillow 12.3.0\u3067\u5b9f\u884c\u3057\u305f\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">alpha.png\u306f\u53ef\u9006WebP\u306e\u307b\u3046\u304c\u5927\u304d\u304f\u306a\u3063\u305f\u305f\u3081\u3001\u53ef\u9006\u306a\u3089\u5e38\u306b\u534a\u5206\u306b\u306a\u308b\u3068\u306f\u6271\u308f\u306a\u3044\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u540c\u3058\u900f\u904e\u5165\u529b\u3092exact\u306a\u3057\u3067\u4fdd\u5b58\u3059\u308b\u3068\u3001\u5b8c\u5168\u306b\u900f\u660e\u306a\u90e8\u5206\u306eRGB\u5024\u304c\u5143\u3068\u7570\u306a\u308b\u3053\u3068\u3082\u78ba\u8a8d\u3057\u305f\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u51fa\u529b\u30d5\u30a9\u30eb\u30c0\u30fc\u304c\u5b58\u5728\u3059\u308b\u3068\u5909\u63db\u524d\u306b\u6b62\u307e\u308a\u3001\u65e2\u5b58WebP\u3068\u5143PNG\u304c\u4fdd\u6301\u3055\u308c\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3057\u305f\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u9014\u4e2d\u306e\u5931\u6557\u3067\u306f\u65b0\u3057\u3044\u30d5\u30a9\u30eb\u30c0\u30fc\u304c\u672a\u5b8c\u6210\u306e\u53ef\u80fd\u6027\u304c\u3042\u308b\u305f\u3081\u3001\u539f\u56e0\u3092\u78ba\u8a8d\u3057\u3066\u5225\u306e\u672a\u4f5c\u6210\u306e\u51fa\u529b\u5148\u3067\u3084\u308a\u76f4\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5143\u3078\u623b\u3059\u3068\u304d\u306f\u4fdd\u6301\u3057\u305fPNG\u3068\u53c2\u7167URL\u3092\u4f7f\u3046\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u753b\u7d20\u304c\u4e00\u81f4\u3057\u3066\u3082\u3001\u8868\u793a\u74b0\u5883\u3084ICC\u306e\u6271\u3044\u307e\u3067\u540c\u3058\u3068\u306f\u9650\u3089\u306a\u3044\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5b9f\u969b\u306e\u63b2\u8f09\u5148\u3067\u900f\u904e\u306e\u7e01\u3001\u6587\u5b57\u3001\u5c0f\u3055\u306a\u56f3\u5f62\u3001\u8272\u3092\u78ba\u8a8d\u3057\u3066\u304b\u3089\u5dee\u3057\u66ff\u3048\u308b\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8a2d\u5b9a\u306e\u4ed5\u69d8\u306f<a href=\"https:\/\/pillow.readthedocs.io\/en\/stable\/handbook\/image-file-formats.html#webp\">Pillow\u306e\u516c\u5f0fWebP\u8aac\u660e<\/a>\u3067\u78ba\u8a8d\u3067\u304d\u308b\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u753b\u50cf\u306e\u7528\u9014\u304b\u3089\u5727\u7e2e\u65b9\u5f0f\u3092\u9078\u3076\u624b\u9806<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u753b\u50cf\u306b\u6c42\u3081\u308b\u6027\u8cea\u304b\u3089\u9806\u306b\u5f53\u3066\u306f\u3081\u308b\u3068\u3001\u53ef\u9006\u3068\u975e\u53ef\u9006\u306e\u3069\u3061\u3089\u3067\u5909\u63db\u3059\u308b\u304b\u3092\u6c7a\u3081\u3089\u308c\u307e\u3059\u30022026\u5e749\u670820\u65e5\u306e\u5b9f\u6e2c\uff08Python 3.13\u30fbPillow 12.3.0\uff09\u306b\u3082\u3068\u3065\u304f\u76ee\u5b89\u3067\u3059\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n\n<li>\u6587\u5b57\u304c\u306b\u3058\u3093\u3067\u306f\u56f0\u308b\u3001\u8272\u3092\u6b63\u78ba\u306b\u4f1d\u3048\u305f\u3044\u753b\u50cf\u306f\u3001\u5143\u306e\u753b\u7d20\u3092\u4fdd\u3064WebP\u306e\u53ef\u9006\u3092\u9078\u3076\u3002<\/li>\n\n\n\n<li>\u8aad\u307f\u8fbc\u307f\u3092\u8efd\u304f\u3057\u305f\u3044\u753b\u50cf\u306f\u3001\u975e\u53ef\u9006\u3092\u9078\u3076\u3002\u5b9f\u6e2c\u3067\u306fPNG\u6bd4\u30671\u5272\u53f0\u307e\u3067\u5c0f\u3055\u304f\u306a\u3063\u305f\u3002<\/li>\n\n\n\n<li>\u5143\u753b\u50cf\u3068\u3057\u3066\u4fdd\u7ba1\u3059\u308b\u3082\u306e\u306f\u3001\u53ef\u9006\u304bPNG\u306e\u307e\u307e\u306b\u3057\u3066\u3001\u3042\u3068\u304b\u3089\u4f5c\u308a\u76f4\u305b\u308b\u3088\u3046\u306b\u3059\u308b\u3002<\/li>\n\n\n\n<li>\u900f\u904e\u304c\u5fc5\u8981\u306a\u753b\u50cf\u306f\u3001WebP\u304c\u900f\u904e\u306b\u5bfe\u5fdc\u3057\u3066\u3044\u308b\u306e\u3067\u53ef\u9006\u30fb\u975e\u53ef\u9006\u306e\u3069\u3061\u3089\u3067\u3082\u9078\u3079\u308b\u3002<\/li>\n\n\n\n<li>\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8\u3084\u6587\u5b57\u5165\u308a\u306e\u56f3\u7248\u3092\u975e\u53ef\u9006\u306b\u3059\u308b\u3068\u304d\u306f\u3001\u8f2a\u90ed\u306e\u5468\u308a\u306e\u5dee\u3092\u62e1\u5927\u3057\u3066\u78ba\u8a8d\u3059\u308b\u3002<\/li>\n\n\n\n<li>\u30aa\u30f3\u30e9\u30a4\u30f3\u306e\u5909\u63db\u3092\u4f7f\u3046\u306a\u3089\u3001\u53ef\u9006\u3068\u975e\u53ef\u9006\u3092\u9078\u3079\u308b\u304b\u3001\u54c1\u8cea\u3092\u6307\u5b9a\u3067\u304d\u308b\u304b\u3001\u5143\u306e\u30d5\u30a1\u30a4\u30eb\u304c\u3069\u3053\u3078\u9001\u3089\u308c\u308b\u304b\u3092\u5148\u306b\u78ba\u8a8d\u3059\u308b\u3002<\/li>\n\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">\u7f6e\u304d\u63db\u3048\u308b\u524d\u306b\u3001\u5909\u63db\u5f8c\u306e\u30d5\u30a1\u30a4\u30eb\u306e\u898b\u305f\u76ee\u3068\u30b5\u30a4\u30ba\u3092\u78ba\u304b\u3081\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u307e\u3068\u3081<\/h2>\n\n\n\n<ul 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