{"id":3448,"date":"2023-06-03T14:23:20","date_gmt":"2023-06-03T05:23:20","guid":{"rendered":"https:\/\/blue-bear.jp\/kb\/?p=3448"},"modified":"2023-06-03T14:23:22","modified_gmt":"2023-06-03T05:23:22","slug":"php-gd%e9%96%a2%e6%95%b0%e3%81%a7%e9%80%8f%e6%98%8e%e9%83%a8%e5%88%86%e3%81%8c%e9%bb%92%e3%81%8f%e3%81%aa%e3%82%8b%e7%8f%be%e8%b1%a1%e3%81%ae%e8%a7%a3%e6%b1%ba%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/blue-bear.jp\/kb\/php-gd%e9%96%a2%e6%95%b0%e3%81%a7%e9%80%8f%e6%98%8e%e9%83%a8%e5%88%86%e3%81%8c%e9%bb%92%e3%81%8f%e3%81%aa%e3%82%8b%e7%8f%be%e8%b1%a1%e3%81%ae%e8%a7%a3%e6%b1%ba%e6%96%b9%e6%b3%95\/","title":{"rendered":"[php] GD\u95a2\u6570\u3067\u900f\u660e\u90e8\u5206\u304c\u9ed2\u304f\u306a\u308b\u73fe\u8c61\u306e\u89e3\u6c7a\u65b9\u6cd5"},"content":{"rendered":"\n<p>JPEG\u5f62\u5f0f\u306e\u753b\u50cf\u3067\u306f\u900f\u660e\u90e8\u5206\u304c\u5b58\u5728\u3057\u306a\u3044\u305f\u3081\u3001\u900f\u904e\u90e8\u5206\u3084\u534a\u900f\u660e\u90e8\u5206\u304c\u3042\u308bPNG\u5f62\u5f0f\u306e\u753b\u50cf\u3092\u4f7f\u7528\u3059\u308b\u3068\u4e88\u671f\u3057\u306a\u3044\u7d50\u679c\u306b\u306a\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u80cc\u666f\u304c\u5857\u308a\u3064\u3076\u3055\u308c\u305f\u308a\u3001\u80cc\u666f\u3068\u306e\u5883\u754c\u90e8\u5206\u304c\u6c5a\u304f\u306a\u3063\u305f\u308a\u3059\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3053\u306e\u554f\u984c\u3092\u89e3\u6c7a\u3059\u308b\u305f\u3081\u306b\u306f\u3001imagealphablending()\u3068imagesavealpha()\u3068\u3044\u3046\u95a2\u6570\u3092\u4f7f\u7528\u3057\u3066\u3001\u30d6\u30ec\u30f3\u30c9\u30e2\u30fc\u30c9\u3068\u30a2\u30eb\u30d5\u30a1\u30c1\u30e3\u30cd\u30eb\u306e\u6271\u3044\u3092\u8a2d\u5b9a\u3059\u308b\u3068\u826f\u3044\u3067\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001PNG\u5f62\u5f0f\u306e\u753b\u50cf\u3067\u900f\u904e\u90e8\u5206\u3084\u534a\u900f\u660e\u90e8\u5206\u3092\u6b63\u3057\u304f\u8868\u793a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/\u5143\u306e\u753b\u50cf\n$original = imagecreatefrompng('.\/sample.png');\n$x = imagesx($original);\n$y = imagesy($original);\n\n\/\/\u7e2e\u5c0f\u5148\n$resize = imagecreatetruecolor($x\/2, $y\/2);\n\/\/\u30d6\u30ec\u30f3\u30c9\u30e2\u30fc\u30c9\u3092\u7121\u52b9\u306b\u3059\u308b\nimagealphablending($resize, false);\n\/\/\u5b8c\u5168\u306a\u30a2\u30eb\u30d5\u30a1\u30c1\u30e3\u30cd\u30eb\u60c5\u5831\u3092\u4fdd\u5b58\u3059\u308b\u30d5\u30e9\u30b0\u3092on\u306b\u3059\u308b\nimagesavealpha($resize, true);\n\n\/\/\u534a\u5206\u306b\u7e2e\u5c0f\nimagecopyresampled($resize, $original, 0, 0, 0, 0, $x\/2, $y\/2, $x, $y);\n\n\/\/\u753b\u50cf\u30d5\u30a1\u30a4\u30eb\u3068\u3057\u3066\u51fa\u529b\nimagepng($resize, '.\/resize.png');\n\n\/\/\u5f8c\u7247\u4ed8\u3051\nimagedestroy($original);\nimagedestroy($resize);<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>JPEG\u5f62\u5f0f\u306e\u753b\u50cf\u3067\u306f\u900f\u660e\u90e8\u5206\u304c\u5b58\u5728\u3057\u306a<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[505],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/blue-bear.jp\/kb\/wp-json\/wp\/v2\/posts\/3448"}],"collection":[{"href":"https:\/\/blue-bear.jp\/kb\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blue-bear.jp\/kb\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blue-bear.jp\/kb\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blue-bear.jp\/kb\/wp-json\/wp\/v2\/comments?post=3448"}],"version-history":[{"count":1,"href":"https:\/\/blue-bear.jp\/kb\/wp-json\/wp\/v2\/posts\/3448\/revisions"}],"predecessor-version":[{"id":3449,"href":"https:\/\/blue-bear.jp\/kb\/wp-json\/wp\/v2\/posts\/3448\/revisions\/3449"}],"wp:attachment":[{"href":"https:\/\/blue-bear.jp\/kb\/wp-json\/wp\/v2\/media?parent=3448"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blue-bear.jp\/kb\/wp-json\/wp\/v2\/categories?post=3448"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blue-bear.jp\/kb\/wp-json\/wp\/v2\/tags?post=3448"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}