{"id":4824,"date":"2012-09-21T10:44:34","date_gmt":"2012-09-21T01:44:34","guid":{"rendered":"http:\/\/labs.gree.jp\/blog\/?p=4824"},"modified":"2021-04-27T15:03:43","modified_gmt":"2021-04-27T06:03:43","slug":"post4824","status":"publish","type":"post","link":"https:\/\/labs.gree.jp\/blog\/2012\/09\/4824\/","title":{"rendered":"ImageMagick \u6539\u9020\u5165\u9580 (\u305d\u306e\u5f10) \u6e1b\u8272\u51e6\u7406\u524d\u7de8"},"content":{"rendered":"<p>\u3053\u3093\u306b\u3061\u306f\u3002\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u57fa\u76e4\u30c1\u30fc\u30e0\u306e\u3088\u3084\u3067\u3059\u3002<\/p>\n<p>\u30a2\u30d0\u30bf\u30fc\u7b49\u3092\u8868\u793a\u3059\u308b\u70ba\u306b PNG \u3084 JPEG \u306e\u753b\u50cf\u3092\u5143\u306b GIF \u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u3092\u751f\u6210\u3059\u308b\u4e8b\u304c\u3088\u304f\u3042\u308a\u307e\u3059\u304c\u3001GIF \u306f 256\u8272\u307e\u3067\u3057\u304b\u6271\u3048\u306a\u3044\u70ba\u3001\u5143\u753b\u50cf\u304c\u6570\u4e07\u3068\u3044\u3063\u305f\u5358\u4f4d\u3067\u8272\u3092\u4f7f\u3063\u3066\u3044\u308b\u3068\u6e1b\u8272\u51e6\u7406\u306b\u5927\u5909\u6642\u9593\u304c\u304b\u304b\u308a\u307e\u3059\u3002\u305d\u3053\u3067\u3001ImageMagick \u306e\u6e1b\u8272\u51e6\u7406\u3092\u6539\u9020\u3057\u3066\u9ad8\u901f\u5316\u3057\u305f\u4e8b\u4f8b\u3092\u3054\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n<p>\u5c1a\u3001\u4e00\u5ea6\u306b\u8aad\u3080\u5206\u91cf\u3067\u306f\u307e\u3068\u3081\u5207\u308c\u306a\u3044\u70ba\u3001\u524d\u7de8\u3068\u5f8c\u7de8\u306b\u5206\u3051\u307e\u3057\u305f\u3002\u524d\u7de8\u306f\u6e1b\u8272\u51e6\u7406\u3001\u5f8c\u7de8\u306f\u305d\u306e\u6539\u9020\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n<p><center><br \/>\n<a href=\"http:\/\/labs.gree.jp\/blog\/2012\/09\/4824\/convert_quantize\/\" rel=\"attachment wp-att-5147\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/labs.gree.jp\/blog\/wp-content\/uploads\/2012\/07\/convert_quantize.png\" alt=\"\" title=\"convert_quantize\" width=\"385\" height=\"261\" class=\"aligncenter size-full wp-image-5147\" srcset=\"https:\/\/labs.gree.jp\/blog\/wp-content\/uploads\/2012\/07\/convert_quantize.png 385w, https:\/\/labs.gree.jp\/blog\/wp-content\/uploads\/2012\/07\/convert_quantize-276x187.png 276w\" sizes=\"auto, (max-width: 385px) 100vw, 385px\" \/><\/a><br \/>\n<\/center><\/p>\n<p>\u30d7\u30ed\u30b0\u30e9\u30e0\u69cb\u6210\u3067\u306f\u4e0a\u306e\u56f3\u306e <strong> magick\/quantize.c <\/strong> \u304c\u6e1b\u8272\u51e6\u7406\u306b\u76f8\u5f53\u3057\u307e\u3059\u3002<\/p>\n<p>\u307e\u305a\u3001\u6e1b\u8272\u51e6\u7406\u306e\u4e00\u822c\u7684\u306a\u8a71\u304b\u3089\u59cb\u3081\u307e\u3059\u3002<\/p>\n<h3 id=\"hs_eefcf37d1805efe15091d53149081883_header_0\"> \u6e1b\u8272\u306e\u5229\u70b9<\/h3>\n<p>Web \u3067\u898b\u304b\u3051\u308b\u753b\u50cf\u30d5\u30a1\u30a4\u30eb\u306e\u591a\u304f\u306f\u30011\u3064\u306epixel(\u63cf\u753b\u306e\u6700\u5c0f\u5358\u4f4d)\u306b\u5bfe\u3057\u3066\u3001Red, Green, Blue \u304c\u5404\u30058bits \u3067\u8a08 24bits(= 3bytes) \u3001\u900f\u660e\u5ea6\u306e Alpha \u5024\u3092\u542b\u3081\u308b\u3068\u66f4\u306b 8bits \u8db3\u3057\u3066\u8a08 32bits(= 4bytes)\u306e\u8272\u60c5\u5831\u3092\u6301\u3061\u307e\u3059\u3002\u305d\u308c\u3092\u7d20\u76f4\u306b PNG \u5f62\u5f0f\u3067\u8868\u3059\u3068\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<br \/>\n<center><br \/>\n<a href=\"http:\/\/labs.gree.jp\/blog\/2012\/09\/4824\/png_rgba2\/\" rel=\"attachment wp-att-5141\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/labs.gree.jp\/blog\/wp-content\/uploads\/2012\/07\/PNG_RGBA2.png\" alt=\"\" title=\"PNG_RGBA\" width=\"320\" height=\"258\" class=\"aligncenter size-full wp-image-5141\" srcset=\"https:\/\/labs.gree.jp\/blog\/wp-content\/uploads\/2012\/07\/PNG_RGBA2.png 320w, https:\/\/labs.gree.jp\/blog\/wp-content\/uploads\/2012\/07\/PNG_RGBA2-248x200.png 248w\" sizes=\"auto, (max-width: 320px) 100vw, 320px\" \/><\/a><br \/>\n<\/center><\/p>\n<p>\u540c\u3058\u8272\u304c\u591a\u3044(=\u4f7f\u3063\u3066\u3044\u308b\u8272\u6570\u304c\u5c11\u306a\u3044)\u5834\u5408\u306f\u3001\u63cf\u753b\u306b\u5fc5\u8981\u306a\u8272\u3092\u5148\u982d\u306b\u307e\u3068\u3081\u308b\u30d1\u30ec\u30c3\u30c8\u5f62\u5f0f\u3092\u7528\u3044\u308b\u3068\u30b5\u30a4\u30ba\u7684\u306b\u6709\u5229\u3067\u3059\u3002\u4f8b\u3048\u3070256\u8272\u4ee5\u4e0b\u3067\u3042\u308c\u3070\u30011pixel \u8fba\u308a 8bits(= 1byte)\u3067 1\u3064\u306e\u8272\u3092\u8868\u73fe\u3067\u304d\u308b\u306e\u3067\u3001\u5341\u5206\u5927\u304d\u306a\u753b\u50cf\u3067\u3042\u308c\u3070 <strong>1\/3 \u8fd1\u304f\u307e\u3067\u30b5\u30a4\u30ba\u304c\u6e1b\u308b<\/strong>\u4e8b\u304c\u3042\u308a\u307e\u3059\u3002<br \/>\n<center><br \/>\n<a href=\"http:\/\/labs.gree.jp\/blog\/2012\/09\/4824\/png_palette2\/\" rel=\"attachment wp-att-5142\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/labs.gree.jp\/blog\/wp-content\/uploads\/2012\/07\/PNG_PALETTE2.png\" alt=\"\" title=\"PNG_PALETTE\" width=\"466\" height=\"237\" class=\"aligncenter size-full wp-image-5142\" srcset=\"https:\/\/labs.gree.jp\/blog\/wp-content\/uploads\/2012\/07\/PNG_PALETTE2.png 466w, https:\/\/labs.gree.jp\/blog\/wp-content\/uploads\/2012\/07\/PNG_PALETTE2-276x140.png 276w\" sizes=\"auto, (max-width: 466px) 100vw, 466px\" \/><\/a><br \/>\n<\/center><\/p>\n<p>\u8272\u3092\u5927\u91cf\u306b\u4f7f\u3063\u3066\u3044\u308b\u753b\u50cf\u3067\u3082\u3001\u8272\u6570\u3092\u6e1b\u3089\u3059\u4e8b\u3067\u30d1\u30ec\u30c3\u30c8\u5f62\u5f0f\u306b\u6301\u3061\u8fbc\u3081\u308c\u3070\u3001\u753b\u50cf\u30d5\u30a1\u30a4\u30eb\u306e\u30c7\u30fc\u30bf\u91cf\u3092\u5927\u5e45\u306b\u6e1b\u3089\u305b\u307e\u3059\u3002\u307e\u305f\u753b\u50cf\u30d5\u30a1\u30a4\u30eb\u306f\u901a\u5e38\u4f55\u304b\u3057\u3089\u306e\u5727\u7e2e\u304c\u306a\u3055\u308c\u3001\u4e00\u822c\u306b\u8272\u6570\u304c\u5c11\u306a\u3044(=\u30d1\u30bf\u30fc\u30f3\u304c\u5c11\u306a\u3044)\u307b\u3069\u5727\u7e2e\u304c\u52b9\u304f\u70ba\u3001<strong>\u753b\u8cea\u306b\u554f\u984c\u304c\u306a\u3044\u7bc4\u56f2\u3067\u51fa\u6765\u308b\u3060\u3051\u8272\u6570\u3092\u6e1b\u3089\u3059<\/strong>\u4e8b\u306f\u753b\u50cf\u30d5\u30a1\u30a4\u30eb\u30b5\u30a4\u30ba\u3084\u3001\u305d\u308c\u3092\u30e6\u30fc\u30b6\u306b\u904b\u3076\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u8ee2\u9001\u6642\u9593\u306b\u6709\u5229\u306b\u50cd\u304d\u307e\u3059\u3002<\/p>\n<h4 id=\"hs_eefcf37d1805efe15091d53149081883_header_1\"> \u6e1b\u8272\u306e\u539f\u7406<\/h4>\n<p>\u6e1b\u8272\u306f\u8272\u306e\u30ea\u30b9\u30c8\u30e9\u3067\u3059\u3002\u30ea\u30b9\u30c8\u30e9\u3055\u308c\u305f\u8272\u306e\u5206\u306f\u3001\u6b8b\u3063\u305f\u8272\u3067\u9811\u5f35\u3063\u3066\u88dc\u3044\u307e\u3059\u3002<\/p>\n<p>\u30b0\u30e9\u30c7\u30fc\u30b7\u30e7\u30f3\u306e\u753b\u50cf\u3092\u4f8b\u306b\u3068\u308a\u307e\u3059\u3002ImageMagick \u306e convert \u30b3\u30de\u30f3\u30c9\u3092\u7528\u3044\u3066\u3001\u9ed2\u304b\u3089\u7dd1\u307e\u3067\u6bb5\u968e\u7684\u306b64\u8272\u4f7f\u3063\u305f\u753b\u50cf\u3092\u4f5c\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"superpre \">\n% convert -size 64x64 gradient:green-blue -rotate 90 grad-g2b.png<\/pre>\n<p><center><br \/>\n<a href=\"http:\/\/labs.gree.jp\/blog\/2012\/09\/4824\/grad-g2b\/\" rel=\"attachment wp-att-5156\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/labs.gree.jp\/blog\/wp-content\/uploads\/2012\/07\/grad-g2b.png\" alt=\"\" title=\"grad-g2b.png\" width=\"64\" height=\"64\" class=\"aligncenter size-full wp-image-5156\" \/><\/a><br \/>\n<\/center><\/p>\n<p>\u591a\u5c11\u7121\u7406\u304c\u3042\u308a\u307e\u3059\u304c\u3001\u4e09\u8272\u3092\u4f7f\u3063\u3066\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u3082\u8868\u73fe\u51fa\u6765\u307e\u3059\u3002<\/p>\n<pre class=\"superpre \">\n% convert -colors 3 grad-g2b.png grad-g2b-3.png <\/pre>\n<p><center><br \/>\n<a href=\"http:\/\/labs.gree.jp\/blog\/2012\/09\/4824\/grad-g2b-3\/\" rel=\"attachment wp-att-5157\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/labs.gree.jp\/blog\/wp-content\/uploads\/2012\/07\/grad-g2b-3.png\" alt=\"\" title=\"grad-g2b-3.png\" width=\"64\" height=\"64\" class=\"aligncenter size-full wp-image-5157\" \/><\/a><br \/>\n<\/center><br \/>\n<center> \u2193 \u771f\u3093\u4e2d\u3092\u62e1\u5927\u2193 <\/center><br \/>\n<center><br \/>\n<a href=\"http:\/\/labs.gree.jp\/blog\/2012\/09\/4824\/grad-g2b-3-crop-dot\/\" rel=\"attachment wp-att-5160\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/labs.gree.jp\/blog\/wp-content\/uploads\/2012\/07\/grad-g2b-3-crop-dot.png\" alt=\"\" title=\"grad-g2b-3-crop-dot\" width=\"257\" height=\"257\" class=\"aligncenter size-full wp-image-5160\" srcset=\"https:\/\/labs.gree.jp\/blog\/wp-content\/uploads\/2012\/07\/grad-g2b-3-crop-dot.png 257w, https:\/\/labs.gree.jp\/blog\/wp-content\/uploads\/2012\/07\/grad-g2b-3-crop-dot-200x200.png 200w\" sizes=\"auto, (max-width: 257px) 100vw, 257px\" \/><\/a><br \/>\n<\/center><\/p>\n<p>\u8907\u6570\u306e\u8272\u3092\u9069\u5207\u306a\u5272\u5408\u3067\u6df7\u305c\u5408\u308f\u305b\u3066\u6d88\u3048\u305f\u306f\u305a\u306e\u8272\u3092\u8868\u73fe\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u624b\u6cd5\u306f\u30c7\u30a3\u30b6\u30ea\u30f3\u30b0\u3068\u547c\u3073\u307e\u3059\u3002<br \/>\n\u4eca\u56de\u306f\u7dd1\u3068\u9ed2\u3068\u3044\u3046\u6975\u7aef\u306b\u9055\u3046\u8272\u3092\u305f\u3063\u305f 3\u8272\u3067\u8868\u73fe\u3057\u305f\u70ba\u306b\u898b\u305f\u76ee\u304c\u60aa\u3044\u3067\u3059\u304c\u3001<strong>128\uff5e256\u8272\u3082\u6b8b\u305b\u3070\u3001\u5927\u62b5\u306f\u4f3c\u305f\u8272\u304c\u5b58\u5728\u3059\u308b<\/strong>\u306e\u3067\u3001\u3053\u308c\u3088\u308a\u307e\u3068\u3082\u306a\u753b\u8cea\u304c\u671f\u5f85\u3067\u304d\u307e\u3059\u3002<\/p>\n<h4 id=\"hs_eefcf37d1805efe15091d53149081883_header_2\"> RGB\u8272\u7a7a\u9593<\/h4>\n<p>\u753b\u50cf\u304c\u4f7f\u3063\u3066\u3044\u308b\u8272(\u30d1\u30ec\u30c3\u30c8)\u3092 Red, Green, Blue \u3092\u8ef8\u306b\u3068\u3063\u305f 3\u6b21\u5143\u306e\u8272\u7a7a\u9593\u306b\u30de\u30c3\u30d4\u30f3\u30b0\u3059\u308b\u3068\u3001\u5b9f\u969b\u306b\u3069\u3093\u306a\u8272\u3092\u4f7f\u3063\u3066\u3044\u308b\u306e\u304b\u4e00\u76ee\u3067\u5206\u304b\u308a\u307e\u3059\u3002<\/p>\n<ul>\n<li>\n 3\uff24\u30ab\u30e9\u30fc\u30de\u30c3\u30d7\u8868\u793a\u30c4\u30fc\u30eb<\/p>\n<ul>\n<li>  <a href=\"http:\/\/d.hatena.ne.jp\/yoya\/20080927\"> http:\/\/d.hatena.ne.jp\/yoya\/20080927 <\/a><\/li>\n<\/ul>\n<\/li>\n<li>\n \u8272\u306e\u5206\u5e03\u30923D\u3067\u8868\u793a\u3059\u308bJavaScript\u3092Three.js\u3067\u4f5c\u3063\u305f<\/p>\n<ul>\n<li>  <a href=\"http:\/\/flspz.blogspot.jp\/2012\/08\/3dplotcolor.html\"> http:\/\/flspz.blogspot.jp\/2012\/08\/3dplotcolor.html <\/a><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>PNG \u306e\u30a2\u30d0\u30bf\u30fc\u753b\u50cf\u3092\u30d1\u30ec\u30c3\u30c8\u5f62\u5f0f\u306b\u5909\u63db\u3057\u3066\u3001\u5404\u3005\u3001\u753b\u50cf\u3068\u8272\u30d1\u30ec\u30c3\u30c8RGB\u7a7a\u9593\u3092\u6a2a\u306b\u4e26\u3079\u307e\u3059\u3002<\/p>\n<pre class=\"superpre \">\n% convert avatar.png png8:avatar-palette.png<\/pre>\n<h3 id=\"hs_eefcf37d1805efe15091d53149081883_header_3\"> avatar.png (\u8272\u6570:16259)<\/h3>\n<p><center><br \/>\n<a href=\"http:\/\/labs.gree.jp\/blog\/2012\/09\/4824\/test1-2\/\" rel=\"attachment wp-att-5238\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/labs.gree.jp\/blog\/wp-content\/uploads\/2012\/08\/test1.png\" alt=\"\" title=\"avatar.png\" width=\"240\" height=\"190\" class=\"aligncenter size-full wp-image-5238\" \/><\/a> <a href=\"http:\/\/labs.gree.jp\/blog\/2012\/09\/4824\/colorcube-png\/\" rel=\"attachment wp-att-5239\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/labs.gree.jp\/blog\/wp-content\/uploads\/2012\/08\/colorcube-png.gif\" alt=\"\" title=\"colorcube-png\" width=\"240\" height=\"240\" class=\"aligncenter size-full wp-image-5239\" srcset=\"https:\/\/labs.gree.jp\/blog\/wp-content\/uploads\/2012\/08\/colorcube-png.gif 240w, https:\/\/labs.gree.jp\/blog\/wp-content\/uploads\/2012\/08\/colorcube-png-200x200.gif 200w\" sizes=\"auto, (max-width: 240px) 100vw, 240px\" \/><\/a><br \/>\n<\/center><\/p>\n<h3 id=\"hs_eefcf37d1805efe15091d53149081883_header_4\"> avatar-palette.gif (\u8272\u6570:256)<\/h3>\n<p><center><br \/>\n<a href=\"http:\/\/labs.gree.jp\/blog\/2012\/09\/4824\/test1-palette\/\" rel=\"attachment wp-att-5639\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/labs.gree.jp\/blog\/wp-content\/uploads\/2012\/09\/test1-palette.png\" alt=\"\" title=\"avatar-palette.png\" width=\"240\" height=\"190\" class=\"aligncenter size-full wp-image-5639\" \/><\/a> <a href=\"http:\/\/labs.gree.jp\/blog\/2012\/09\/4824\/colorcube-gif\/\" rel=\"attachment wp-att-5240\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/labs.gree.jp\/blog\/wp-content\/uploads\/2012\/08\/colorcube-gif.gif\" alt=\"\" title=\"colorcube-palette\" width=\"240\" height=\"240\" class=\"aligncenter size-full wp-image-5240\" srcset=\"https:\/\/labs.gree.jp\/blog\/wp-content\/uploads\/2012\/08\/colorcube-gif.gif 240w, https:\/\/labs.gree.jp\/blog\/wp-content\/uploads\/2012\/08\/colorcube-gif-200x200.gif 200w\" sizes=\"auto, (max-width: 240px) 100vw, 240px\" \/><\/a><br \/>\n<\/center><\/p>\n<p>\u304a\u304a\u3088\u305d\u5909\u308f\u308a\u306e\u7121\u3044\u753b\u50cf\u306b\u898b\u3048\u307e\u3059\u304c\u3001\u30d1\u30ec\u30c3\u30c8\u5f62\u5f0fPNG\u753b\u50cf\u306e\u8272\u7a7a\u9593\u3092\u898b\u308b\u3068\u3001\u4f7f\u3063\u3066\u3044\u308b\u8272\u304c\u5927\u5e45\u306b\u6e1b\u3063\u3066\u3044\u308b\u306e\u304c\u5206\u304b\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"superpre \">\n% ls -ltr avatar.png  avatar-palette.png\n-rw-r--r-- 1 yoya yoya 100517 2012-08-10 04:44 avatar.png\n-rw-r--r-- 1 yoya yoya 36102 2012-09-21 10:06 avatar-palette.png<\/pre>\n<p>\u753b\u50cf\u30d5\u30a1\u30a4\u30eb\u30b5\u30a4\u30ba\u3082\u6fc0\u6e1b\u3057\u307e\u3059\u3002(100,517 bytes \u2192 36,102  bytes)<\/p>\n<p>\u305f\u3060\u3001\u3053\u306e\u8272\u7a7a\u9593\u3092\u898b\u308b\u3068\u3001\u7dd1\u3084\u8d64\u7d2b\u304c\u6e1b\u308a\u904e\u304e\u3066\u76f4\u611f\u7684\u306b\u602a\u3057\u3044\u3067\u3059\u3002\u30d4\u30af\u30bb\u30eb\u6bce\u306e\u5dee\u5206\u306e\u7d76\u5bfe\u5024\u3092\u53d6\u3063\u3066\u78ba\u8a8d\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<ul>\n<li> \u5dee\u5206\u62bd\u51fa\u30c4\u30fc\u30eb: <a href=\"http:\/\/d.hatena.ne.jp\/yoya\/20120712\/php\"> http:\/\/d.hatena.ne.jp\/yoya\/20120712\/php <\/a><\/li>\n<\/ul>\n<p><center><br \/>\n<a href=\"http:\/\/labs.gree.jp\/blog\/2012\/09\/4824\/test1-diff\/\" rel=\"attachment wp-att-5291\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/labs.gree.jp\/blog\/wp-content\/uploads\/2012\/08\/test1-diff.png\" alt=\"\" title=\"avatar-diff\" width=\"240\" height=\"190\" class=\"aligncenter size-full wp-image-5291\" \/><\/a><br \/>\n<\/center><br \/>\n\u5dee\u5206\u3092\u5f37\u8abf\u3057\u3066\u3044\u308b\u306e\u3067\u5b9f\u969b\u3088\u308a\u6975\u7aef\u306a\u8868\u793a\u3067\u3059\u304c\u3001\u8272\u76f8\u7684\u306b\u7dd1\u3068\u8d64\u7d2b\u304c\u591a\u304f\u66f8\u304d\u63db\u3048\u3089\u308c\u3066\u3044\u308b\u4e8b\u304c\u5206\u304b\u308a\u307e\u3059\u3002<\/p>\n<h3 id=\"hs_eefcf37d1805efe15091d53149081883_header_5\"> \u6e1b\u8272\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0<\/h3>\n<p>\u5143\u306e\u753b\u50cf\u3068\u898b\u305f\u76ee\u3092\u306a\u308b\u3079\u304f\u5909\u3048\u305a\u306b\u6e1b\u8272\u3059\u308b\u76ee\u7684\u3067\u3001\u69d8\u3005\u306a\u8272\u6c7a\u5b9a\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u304c\u5b58\u5728\u3057\u307e\u3059\u3002<\/p>\n<h4 id=\"hs_eefcf37d1805efe15091d53149081883_header_6\"> \u5747\u7b49\u91cf\u5b50\u5316\u6cd5<\/h4>\n<p>RGB \u8272\u7a7a\u9593\u306e\u7acb\u65b9\u4f53\u3092\u5747\u7b49\u306b\u5206\u5272\u3057\u3066\u3001\u5404\u7acb\u65b9\u4f53\u6bce\u306b\u542b\u307e\u308c\u308b\u8272\u3092 1\u3064\u306e\u8272\u306b\u4ee3\u8868\u3055\u305b\u307e\u3059\u3002<\/p>\n<p><a href=\"http:\/\/labs.gree.jp\/blog\/2012\/09\/4824\/36bb133f70b7f5d25f278bd3fcb44efc\/\" rel=\"attachment wp-att-5429\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/labs.gree.jp\/blog\/wp-content\/uploads\/2012\/09\/36bb133f70b7f5d25f278bd3fcb44efc.png\" alt=\"\" title=\"rgbcube\" width=\"261\" height=\"283\" class=\"aligncenter size-full wp-image-5429\" srcset=\"https:\/\/labs.gree.jp\/blog\/wp-content\/uploads\/2012\/09\/36bb133f70b7f5d25f278bd3fcb44efc.png 261w, https:\/\/labs.gree.jp\/blog\/wp-content\/uploads\/2012\/09\/36bb133f70b7f5d25f278bd3fcb44efc-184x200.png 184w\" sizes=\"auto, (max-width: 261px) 100vw, 261px\" \/><\/a> <a href=\"http:\/\/labs.gree.jp\/blog\/2012\/09\/4824\/489ef4361f33c557d167b944a30a1cf7\/\" rel=\"attachment wp-att-5430\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/labs.gree.jp\/blog\/wp-content\/uploads\/2012\/09\/489ef4361f33c557d167b944a30a1cf7.png\" alt=\"\" title=\"rgbcube8\" width=\"255\" height=\"275\" class=\"aligncenter size-full wp-image-5430\" srcset=\"https:\/\/labs.gree.jp\/blog\/wp-content\/uploads\/2012\/09\/489ef4361f33c557d167b944a30a1cf7.png 255w, https:\/\/labs.gree.jp\/blog\/wp-content\/uploads\/2012\/09\/489ef4361f33c557d167b944a30a1cf7-185x200.png 185w\" sizes=\"auto, (max-width: 255px) 100vw, 255px\" \/><\/a><\/p>\n<ul>\n<li> \u5404\u683c\u5b50\u6bce\u306b\u3001\u30ad\u30ea\u306e\u826f\u3044\u4e00\u70b9\u306b\u53ce\u675f\u3059\u308b\u69d8\u5b50\u306e\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u3002<\/li>\n<\/ul>\n<p><iframe loading=\"lazy\" width=\"420\" height=\"315\" src=\"http:\/\/www.youtube.com\/embed\/e4Vnp1oG5lg?rel=0\" frameborder=\"0\" allowfullscreen><\/iframe><\/p>\n<p>\u3053\u306e\u6e1b\u8272\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306f\u975e\u5e38\u306b\u5358\u7d14\u3067\u3001PHP \u3060\u306820\u884c\u7a0b\u5ea6\u3067\u5b9f\u88c5\u51fa\u6765\u307e\u3059\u3002(\u4e0a\u306e\u56f3\u306e\u3088\u3046\u306b 8x8x8 \u5206\u5272\u306b\u3059\u308b\u3068 512 \u306b\u306a\u308a\u3001256 \u8272\u306b\u53ce\u307e\u3089\u306a\u3044\u306e\u3067\u3001\u9752\u306f 4 \u5206\u5272)<\/p>\n<pre class=\"superpre \">\n<?php\n\n$imgdata = file_get_contents($argv[1]);\n$output_file = $argv[2];\n$im1 = imagecreatefromstring($imgdata);\n\n$width  = imagesx($im1);\n$height = imagesy($im1);\n\n$im2 = imagecreatetruecolor($width, $height);\n\nfor ($y = 0 ; $y < $height ; $y++) {\n    for ($x = 0 ; $x < $width ; $x++) {\n        $i1 = imagecolorat($im1, $x, $y);\n        $rgba1 = imagecolorsforindex($im1, $i1);\n        $red   = $rgba1['red']   & -(0x100\/8); \/\/ quantize 8\n        $green = $rgba1['green'] & -(0x100\/8); \/\/ quantize 8\n        $blue  = $rgba1['blue']  & -(0x100\/4); \/\/ quantize 4\n        $color = imagecolorallocate($im2, $red, $green, $blue);\n        imagesetpixel($im2, $x, $y, $color);\n    }\n}\n\nimagegif($im2, $output_file);<\/pre>\n<ul>\n<li> \u5b9f\u884c\u3057\u307e\u3059\u3002<\/li>\n<\/ul>\n<pre class=\"superpre \">\n% php bitmap_quantize.php avatar.png avatar-quantize.gif<\/pre>\n<ul>\n<li> \u51e6\u7406\u7d50\u679c<\/li>\n<\/ul>\n<p><center><br \/>\n<a href=\"http:\/\/labs.gree.jp\/blog\/2012\/09\/4824\/test1-quantize\/\" rel=\"attachment wp-att-5439\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/labs.gree.jp\/blog\/wp-content\/uploads\/2012\/09\/test1-quantize.gif\" alt=\"\" title=\"avatar-quantize\" width=\"240\" height=\"190\" class=\"aligncenter size-full wp-image-5439\" \/><\/a> <a href=\"http:\/\/labs.gree.jp\/blog\/2012\/09\/4824\/colorcube-quantize\/\" rel=\"attachment wp-att-5440\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/labs.gree.jp\/blog\/wp-content\/uploads\/2012\/09\/colorcube-quantize.gif\" alt=\"\" title=\"colorcube-quantize\" width=\"240\" height=\"240\" class=\"aligncenter size-full wp-image-5440\" srcset=\"https:\/\/labs.gree.jp\/blog\/wp-content\/uploads\/2012\/09\/colorcube-quantize.gif 240w, https:\/\/labs.gree.jp\/blog\/wp-content\/uploads\/2012\/09\/colorcube-quantize-200x200.gif 200w\" sizes=\"auto, (max-width: 240px) 100vw, 240px\" \/><\/a><br \/>\n<\/center><\/p>\n<ul>\n<li> \u9854\u306e\u8fba\u308a\u3092\u30c9\u30c3\u30c8\u5358\u4f4d\u3067\u62e1\u5927\u3057\u3066\u307f\u307e\u3059\u3002<\/li>\n<\/ul>\n<p><center><br \/>\n<a href=\"http:\/\/labs.gree.jp\/blog\/2012\/09\/4824\/test1-parts-dotize\/\" rel=\"attachment wp-att-5549\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/labs.gree.jp\/blog\/wp-content\/uploads\/2012\/09\/test1-parts-dotize.png\" alt=\"\" title=\"avatar-parts-dotize\" width=\"265\" height=\"257\" class=\"aligncenter size-full wp-image-5549\" srcset=\"https:\/\/labs.gree.jp\/blog\/wp-content\/uploads\/2012\/09\/test1-parts-dotize.png 265w, https:\/\/labs.gree.jp\/blog\/wp-content\/uploads\/2012\/09\/test1-parts-dotize-206x200.png 206w\" sizes=\"auto, (max-width: 265px) 100vw, 265px\" \/><\/a> => <a href=\"http:\/\/labs.gree.jp\/blog\/2012\/09\/4824\/test1-quantize-parts-dotize\/\" rel=\"attachment wp-att-5550\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/labs.gree.jp\/blog\/wp-content\/uploads\/2012\/09\/test1-quantize-parts-dotize.png\" alt=\"\" title=\"avatar-quantize-parts-dotize\" width=\"257\" height=\"249\" class=\"aligncenter size-full wp-image-5550\" srcset=\"https:\/\/labs.gree.jp\/blog\/wp-content\/uploads\/2012\/09\/test1-quantize-parts-dotize.png 257w, https:\/\/labs.gree.jp\/blog\/wp-content\/uploads\/2012\/09\/test1-quantize-parts-dotize-206x200.png 206w\" sizes=\"auto, (max-width: 257px) 100vw, 257px\" \/><\/a><br \/>\n<\/center><br \/>\n\u5927\u62b5\u306e\u753b\u50cf\u3067<strong>\u753b\u8cea\u304c\u304b\u306a\u308a\u52a3\u5316\u3059\u308b<\/strong>\u306e\u3067\u3001\u3053\u306e\u65b9\u6cd5\u306f\u5b9f\u969b\u306b\u306f\u3042\u307e\u308a\u4f7f\u308f\u308c\u307e\u305b\u3093\u3002<\/p>\n<h4 id=\"hs_eefcf37d1805efe15091d53149081883_header_7\"> \u4ed6\u3001\u30e1\u30b8\u30e3\u30fc\u306a\u65b9\u6cd5<\/h4>\n<p>\u4e2d\u592e\u5024\u5206\u5272\u6cd5(median cut)\u3001\u983b\u5ea6\u5747\u7b49\u5316\u6cd5(population equalize)\u304c\u5b9f\u7528\u7684\u3067\u304b\u3064\u30e1\u30b8\u30e3\u30fc\u3060\u3068\u601d\u308f\u308c\u307e\u3059\u304c\u3001\u3053\u308c\u3089\u306f\u8aac\u660e\u56f3\u3092\u63cf\u304f\u306e\u304c\u96e3\u3057\u3044\u306e\u3067\u3001\u3059\u307f\u307e\u305b\u3093\u3001\u7aef\u6298\u3089\u305b\u3066\u4e0b\u3055\u3044\u3002<\/p>\n<p>\u5206\u304b\u308a\u6613\u3044\u8aac\u660e\u306e\u3042\u308b URL \u306b\u30ea\u30f3\u30af\u3092\u5f35\u308a\u307e\u3059\u3002\u3054\u53c2\u8003\u307e\u3067\u306b\u3002<\/p>\n<ul>\n<li>\n 24bit \u2192 8bit \u6e1b\u8272<\/p>\n<ul>\n<li>  <a href=\"http:\/\/koujinz.cocolog-nifty.com\/blog\/2009\/04\/24bit-8bit-a879.html\"> http:\/\/koujinz.cocolog-nifty.com\/blog\/2009\/04\/24bit-8bit-a879.html<\/a><\/li>\n<\/ul>\n<\/li>\n<li>\n \u30e1\u30c7\u30a3\u30a2\u30f3\u30ab\u30c3\u30c8\u6cd5\u306b\u3088\u308b\u753b\u50cf\u306e\u6e1b\u8272<\/p>\n<ul>\n<li>  <a href=\"http:\/\/www.spicysoft.com\/spicylab\/blog\/?itemid=1073\"> http:\/\/www.spicysoft.com\/spicylab\/blog\/?itemid=1073 <\/a><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h4 id=\"hs_eefcf37d1805efe15091d53149081883_header_8\"> ImageMagick \u306e\u6e1b\u8272\u51e6\u7406\u89e3\u8aac<\/h4>\n<p>ImageMagick \u306e\u6e1b\u8272\u51e6\u7406\u306e\u6982\u8981\u306f\u516c\u5f0f\u30b5\u30a4\u30c8\u306b\u3042\u308a\u307e\u3059\u3002<\/p>\n<ul>\n<li> <a href=\"http:\/\/www.imagemagick.org\/www\/quantize.html\"> http:\/\/www.imagemagick.org\/www\/quantize.html <\/a><\/li>\n<\/ul>\n<p>ImageMagick \u306e\u6e1b\u8272\u51e6\u7406\u306f 3\u3064\u306e\u30d5\u30a7\u30a4\u30ba\u306b\u5206\u304b\u308c\u307e\u3059\u3002<\/p>\n<ul>\n<li>\n (1) \u8272\u7a7a\u9593\u306e\u5206\u5272\u3068\u5404\u7acb\u65b9\u4f53\u306b\u542b\u307e\u308c\u308b\u8272\u306e\u91cf\u5b50\u5316\u8aa4\u5dee(\u3070\u3089\u3064\u304d\u5177\u5408)\u306e\u7b97\u51fa<\/p>\n<ul>\n<li>  (1.1) \u8272\u7a7a\u9593\u306e\u7acb\u65b9\u4f53\u3092\u518d\u5e30\u7684\u306b 8\u5206\u5272<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><center><br \/>\n<a href=\"http:\/\/labs.gree.jp\/blog\/2012\/09\/4824\/rgb-octree\/\" rel=\"attachment wp-att-5516\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/labs.gree.jp\/blog\/wp-content\/uploads\/2012\/09\/rgb-octree.png\" alt=\"\" title=\"rgb-octree\" width=\"516\" height=\"355\" class=\"aligncenter size-full wp-image-5516\" srcset=\"https:\/\/labs.gree.jp\/blog\/wp-content\/uploads\/2012\/09\/rgb-octree.png 516w, https:\/\/labs.gree.jp\/blog\/wp-content\/uploads\/2012\/09\/rgb-octree-276x189.png 276w\" sizes=\"auto, (max-width: 516px) 100vw, 516px\" \/><\/a><br \/>\n<\/center><\/p>\n<ul>\n<li>  (1.2) \u7acb\u65b9\u4f53\u306b\u542b\u307e\u308c\u308b\u5404\u8272\u306e\u7acb\u65b9\u4f53\u4e2d\u592e\u304b\u3089\u306e\u8ddd\u96e2\u3092\u5408\u7b97<\/li>\n<\/ul>\n<p><center><br \/>\n<a href=\"http:\/\/labs.gree.jp\/blog\/2012\/09\/4824\/quantize_error\/\" rel=\"attachment wp-att-5525\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/labs.gree.jp\/blog\/wp-content\/uploads\/2012\/09\/quantize_error.png\" alt=\"\" title=\"quantize_error\" width=\"274\" height=\"345\" class=\"aligncenter size-full wp-image-5525\" srcset=\"https:\/\/labs.gree.jp\/blog\/wp-content\/uploads\/2012\/09\/quantize_error.png 274w, https:\/\/labs.gree.jp\/blog\/wp-content\/uploads\/2012\/09\/quantize_error-158x200.png 158w\" sizes=\"auto, (max-width: 274px) 100vw, 274px\" \/><\/a><br \/>\n<\/center><\/p>\n<ul>\n<li>   \u8a72\u5f53\u3059\u308b\u30b3\u30fc\u30c9: imagemagick-6.6.0.4\/magick\/quantize.c (ClassifyImageColors)<\/li>\n<\/ul>\n<pre class=\"superpre c\">\nstatic MagickBooleanType ClassifyImageColors(CubeInfo *cube_info,\n  const Image *image,ExceptionInfo *exception)\n\uff1c\u7565\uff1e\n        if (node_info->child[id] == (NodeInfo *) NULL)\n          {\n            \/*\n              Set colors of new node to contain pixel.\n            *\/\n            node_info->child[id]=GetNodeInfo(cube_info,id,level,node_info);\n            if (node_info->child[id] == (NodeInfo *) NULL)\n              (void) ThrowMagickException(exception,GetMagickModule(),\n                ResourceLimitError,\"MemoryAllocationFailed\",\"`%s'\",\n                image->filename);\n            if (level == MaxTreeDepth)\n              cube_info->colors++;\n          }\n        \/*\n          Approximate the quantization error represented by this node.\n        *\/\n        node_info=node_info->child[id];\n        error.red=QuantumScale*(pixel.red-mid.red);\n        error.green=QuantumScale*(pixel.green-mid.green);\n        error.blue=QuantumScale*(pixel.blue-mid.blue);\n        if (cube_info->associate_alpha != MagickFalse)\n          error.opacity=QuantumScale*(pixel.opacity-mid.opacity);\n        node_info->quantize_error+=sqrt((double) (count*error.red*error.red+\n          count*error.green*error.green+count*error.blue*error.blue+\n          count*error.opacity*error.opacity));\n        cube_info->root->quantize_error+=node_info->quantize_error;\n        index--;<\/pre>\n<ul>\n<li>\n  (2) \u91cf\u5b50\u5316\u8aa4\u5dee(quantize_error)\u306e\u5c0f\u3055\u306a\u7acb\u65b9\u4f53\u3092\u3001\u305d\u308c\u3092\u542b\u3080\u4e00\u56de\u308a\u5927\u304d\u306a\u7acb\u65b9\u4f53\u306b\u5438\u53ce\u3059\u308b<\/p>\n<ul>\n<li>  (2.1) \u91cf\u5b50\u5316\u8aa4\u5dee\u306e\u5c0f\u3055\u3044\u7acb\u65b9\u4f53\u3092\u63a2\u3059<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><center><br \/>\n<a href=\"http:\/\/labs.gree.jp\/blog\/2012\/09\/4824\/rgb-prune1\/\" rel=\"attachment wp-att-5528\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/labs.gree.jp\/blog\/wp-content\/uploads\/2012\/09\/rgb-prune1.png\" alt=\"\" title=\"rgb-prune1\" width=\"520\" height=\"282\" class=\"aligncenter size-full wp-image-5528\" srcset=\"https:\/\/labs.gree.jp\/blog\/wp-content\/uploads\/2012\/09\/rgb-prune1.png 520w, https:\/\/labs.gree.jp\/blog\/wp-content\/uploads\/2012\/09\/rgb-prune1-276x149.png 276w\" sizes=\"auto, (max-width: 520px) 100vw, 520px\" \/><\/a><br \/>\n<\/center><\/p>\n<ul>\n<li>  (2.2) \u3072\u3068\u3064\u89aa\u306e\u7acb\u65b9\u4f53\u306b\u5438\u53ce\u3059\u308b<\/li>\n<\/ul>\n<p><center><br \/>\n<a href=\"http:\/\/labs.gree.jp\/blog\/2012\/09\/4824\/rgb-prune2\/\" rel=\"attachment wp-att-5529\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/labs.gree.jp\/blog\/wp-content\/uploads\/2012\/09\/rgb-prune2.png\" alt=\"\" title=\"rgb-prune2\" width=\"509\" height=\"271\" class=\"aligncenter size-full wp-image-5529\" srcset=\"https:\/\/labs.gree.jp\/blog\/wp-content\/uploads\/2012\/09\/rgb-prune2.png 509w, https:\/\/labs.gree.jp\/blog\/wp-content\/uploads\/2012\/09\/rgb-prune2-276x146.png 276w\" sizes=\"auto, (max-width: 509px) 100vw, 509px\" \/><\/a><br \/>\n<\/center><\/p>\n<ul>\n<li>   \u8a72\u5f53\u3059\u308b\u30b3\u30fc\u30c9: imagemagick-6.6.0.4\/magick\/quantize.c (ReduceImageColors)<\/li>\n<\/ul>\n<pre class=\"superpre c\">\nstatic void ReduceImageColors(const Image *image,CubeInfo *cube_info)\n\uff1c\u7565\uff1e\n  cube_info->next_threshold=0.0;\n  for (span=cube_info->colors; cube_info->colors > cube_info->maximum_colors; )\n  {\n    cube_info->pruning_threshold=cube_info->next_threshold;\n    cube_info->next_threshold=cube_info->root->quantize_error-1;\n    cube_info->colors=0;\n    Reduce(image,cube_info,cube_info->root);\n    offset=(MagickOffsetType) span-cube_info->colors;\n    proceed=SetImageProgress(image,ReduceImageTag,offset,span-\n      cube_info->maximum_colors+1);\n    if (proceed == MagickFalse)\n      break;\n  }<\/pre>\n<ul>\n<li>\n  (3) \u524a\u9664\u3055\u308c\u305f\u7acb\u65b9\u4f53\u306b\u542b\u307e\u308c\u3066\u3044\u305f\u8272\u3092\u6b8b\u3063\u305f\u7acb\u65b9\u4f53\u306e\u8272\u306b\u5272\u308a\u5f53\u3066\u76f4\u3059\u3002<\/p>\n<ul>\n<li>  (3.1) \u6d88\u3057\u305f\u7acb\u65b9\u4f53\u306e\u8272\u3092\u4e0a\u4f4d\u306e\u7acb\u65b9\u4f53\u306e\u8272\u3068\u3057\u3066\u6271\u3046\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><center><br \/>\n<a href=\"http:\/\/labs.gree.jp\/blog\/2012\/09\/4824\/rgb-remap1\/\" rel=\"attachment wp-att-5532\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/labs.gree.jp\/blog\/wp-content\/uploads\/2012\/09\/rgb-remap1.png\" alt=\"\" title=\"rgb-remap1\" width=\"500\" height=\"253\" class=\"aligncenter size-full wp-image-5532\" srcset=\"https:\/\/labs.gree.jp\/blog\/wp-content\/uploads\/2012\/09\/rgb-remap1.png 500w, https:\/\/labs.gree.jp\/blog\/wp-content\/uploads\/2012\/09\/rgb-remap1-276x139.png 276w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><br \/>\n<\/center><\/p>\n<ul>\n<li>  (3.2) \u305d\u306e\u7acb\u65b9\u4f53\u306b\u5b50\u4f9b\u304c\u3044\u308c\u3070\u3001\u5b50\u4f9b\u306e\u4e2d\u3067\u8fd1\u3044\u8272\u306b\u518d\u5272\u5f53\u3059\u308b<\/li>\n<\/ul>\n<p><center><br \/>\n<a href=\"http:\/\/labs.gree.jp\/blog\/2012\/09\/4824\/rgb-remap2\/\" rel=\"attachment wp-att-5533\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/labs.gree.jp\/blog\/wp-content\/uploads\/2012\/09\/rgb-remap2.png\" alt=\"\" title=\"rgb-remap2\" width=\"500\" height=\"253\" class=\"aligncenter size-full wp-image-5533\" srcset=\"https:\/\/labs.gree.jp\/blog\/wp-content\/uploads\/2012\/09\/rgb-remap2.png 500w, https:\/\/labs.gree.jp\/blog\/wp-content\/uploads\/2012\/09\/rgb-remap2-276x139.png 276w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><br \/>\n<\/center><\/p>\n<ul>\n<li>  \u8a72\u5f53\u3059\u308b\u30b3\u30fc\u30c9: imagemagick-6.6.0.4\/magick\/quantize.c (AssignImageColors)<\/li>\n<\/ul>\n<pre class=\"superpre c\">\nstatic MagickBooleanType AssignImageColors(Image *image,CubeInfo *cube_info)\n\uff1c\u7565\uff1e\n          ClosestColor(image,cube_info,node_info->parent);\n          index=cube_info->color_number;\n          for (i=0; i < (long) count; i++)\n          {\n            if (image->storage_class == PseudoClass)\n              indexes[x+i]=(IndexPacket) index;\n            if (cube_info->quantize_info->measure_error == MagickFalse)\n              {\n                q->red=image->colormap[index].red;\n                q->green=image->colormap[index].green;\n                q->blue=image->colormap[index].blue;\n                if (cube_info->associate_alpha != MagickFalse)\n                  q->opacity=image->colormap[index].opacity;\n              }\n            q++;\n          }<\/pre>\n<h5 id=\"hs_eefcf37d1805efe15091d53149081883_header_9\"> ImageMagick \u306e\u8272\u7a7a\u9593\u5206\u5272\u52d5\u753b<\/h5>\n<p>\u6e1b\u8272\u304c\u9032\u3080\u306b\u3064\u308c\u3001\u8272\u7a7a\u9593\u306e\u5206\u5272\u304c\u8352\u304f\u306a\u308b\u69d8\u5b50\u3092\u52d5\u753b\u306b\u3057\u307e\u3057\u305f\u3002<br \/>\n\u3044\u305a\u308c\u3082 1\u8272\u307e\u3067\u6e1b\u8272\u3057\u3066\u3044\u307e\u3059\u304c\u3001\u901a\u5e38\u306f\u305d\u306e\u9014\u4e2d(128\u8272\u3084256\u8272\u307e\u3067\u6e1b\u3063\u305f\u6240)\u3067\u6b62\u3081\u307e\u3059\u3002<\/p>\n<ul>\n<li> 4\u8272\u306e\u753b\u50cf\u3092 1\u8272\u306b\u6e1b\u8272<\/li>\n<\/ul>\n<p><center><br \/>\n<a href=\"http:\/\/labs.gree.jp\/blog\/2012\/09\/4824\/4color-128x128\/\" rel=\"attachment wp-att-5522\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/labs.gree.jp\/blog\/wp-content\/uploads\/2012\/09\/4color-128x128.png\" alt=\"\" title=\"4color-128x128\" width=\"128\" height=\"128\" class=\"aligncenter size-full wp-image-5522\" \/><\/a><br \/>\n<\/center><br \/>\n<\/a><\/p>\n<ul>\n<li> \u8d64\u9752\u7dd1\u9ec4\u306e 4\u8272\u3067\u30d0\u30e9\u30d0\u30e9\u306b\u306a\u3063\u3066\u3044\u308b\u7acb\u65b9\u4f53\u304c\u3001\u4e00\u3064\u306b\u307e\u3068\u307e\u308b\u69d8\u5b50\u3067\u3059\u3002<\/li>\n<\/ul>\n<p><iframe loading=\"lazy\" width=\"420\" height=\"315\" src=\"http:\/\/www.youtube.com\/embed\/XjKUSVjk4vA?rel=0\" frameborder=\"0\" allowfullscreen><\/iframe><\/p>\n<ul>\n<li> \u30af\u30ea\u30ce\u30c3\u30da\u306e\u304b\u3051\u3063\u3053\u5199\u771f\u3092 1\u8272\u306b\u6e1b\u8272<\/li>\n<\/ul>\n<p><a href=\"http:\/\/labs.gree.jp\/blog\/2012\/09\/4824\/300i899-480640\/\" rel=\"attachment wp-att-5498\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/labs.gree.jp\/blog\/wp-content\/uploads\/2012\/09\/300i899.480640.gif\" alt=\"\" title=\"300i899.480640\" width=\"240\" height=\"320\" class=\"aligncenter size-full wp-image-5498\" srcset=\"https:\/\/labs.gree.jp\/blog\/wp-content\/uploads\/2012\/09\/300i899.480640.gif 480w, https:\/\/labs.gree.jp\/blog\/wp-content\/uploads\/2012\/09\/300i899.480640-150x200.gif 150w, https:\/\/labs.gree.jp\/blog\/wp-content\/uploads\/2012\/09\/300i899.480640-300x400.gif 300w\" sizes=\"auto, (max-width: 240px) 100vw, 240px\" \/><\/a><\/p>\n<ul>\n<li> \u5143\u753b\u50cf\u306b\u7d14\u7c8b\u306a\u9752(RGB:#0000FF)\u304c\u7121\u3044\u306e\u3067\u3001\u305d\u306e\u8fba\u308a\u306e\u7acb\u65b9\u4f53\u304c\u6b20\u3051\u3066\u3044\u307e\u3059\u3002<\/li>\n<\/ul>\n<p><iframe loading=\"lazy\" width=\"420\" height=\"315\" src=\"http:\/\/www.youtube.com\/embed\/ny4iiCAlv4U?rel=0\" frameborder=\"0\" allowfullscreen><\/iframe><\/p>\n<h3 id=\"hs_eefcf37d1805efe15091d53149081883_header_10\"> \u307e\u3068\u3081<\/h3>\n<ul>\n<li> RGB \u8272\u7a7a\u9593\u3092\u5c0f\u3055\u306a\u7acb\u65b9\u4f53\u306b\u518d\u5e30\u7684\u306b\u5206\u5272\u3057\u3066 8\u5206\u6728\u30c4\u30ea\u30fc\u69cb\u9020\u3067\u4fdd\u6301<\/li>\n<li> \u30c4\u30ea\u30fc\u306e\u6df1\u3044\u65b9\u304b\u3089\u8272\u306e\u3070\u3089\u3064\u304d\u304c\u5c0f\u3055\u3044\u9806\u306b\u7acb\u65b9\u4f53\u3092\u524a\u9664<\/li>\n<li> \u524a\u9664\u3057\u305f\u7acb\u65b9\u4f53\u306e\u8272\u306f\u30c4\u30ea\u30fc\u69cb\u9020\u7684\u306b\u8fd1\u304f\u3066\u6df1\u3044\u65b9\u306e\u7acb\u65b9\u4f53\u306e\u8272\u306b\u66f8\u304d\u66ff\u3048<\/li>\n<\/ul>\n<h3 id=\"hs_eefcf37d1805efe15091d53149081883_header_11\"> \u5099\u8003<\/h3>\n<ul>\n<li> \u900f\u660e\u5ea6\u3064\u304d\u306e\u753b\u50cf\u3067\u306f RGBA \u306e 4\u3064\u306e\u8ef8\u304c\u51fa\u6765\u308b\u306e\u3067\u3001<strong>4\u6b21\u5143\u306e\u30cf\u30a4\u30d1\u30fc\u30ad\u30e5\u30fc\u30d6\u3092 16 \u9032\u6728\u3067\u8868\u73fe<\/strong>\u3057\u307e\u3059\u30024\u6b21\u5143\u306e\u56f3\u306f\u3055\u3059\u304c\u306b\u5206\u304b\u308a\u96e3\u3044\u306e\u3067\u3001\u4eca\u56de\u306f RGB \u306e3\u6b21\u5143\u3092\u4f8b\u306b\u3057\u307e\u3057\u305f\u3002<\/li>\n<li> \u91cf\u5b50\u5316\u8aa4\u5dee(quantization error)\u306f\u672c\u6765\u3001\u30a2\u30ca\u30ed\u30b0\u4fe1\u53f7\u3092\u30c7\u30b8\u30bf\u30eb\u5024\u306b\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u3059\u308b\u969b\u306e\u8aa4\u5dee\u3092\u8868\u3059\u8a00\u8449\u3067\u3059\u304c\u3001ImageMagick \u306e NodeInfo \u69cb\u9020\u4f53\u306b\u3042\u308b quantize_error \u30e1\u30f3\u30d0\u5909\u6570\u306f\u5206\u5272\u3057\u305f\u8272\u7a7a\u9593\u5185\u306e\u30d1\u30ec\u30c3\u30c8\u8272\u306e\u3070\u3089\u3064\u304d\u5177\u5408\u3092\u8868\u3057\u3066\u3044\u308b\u306e\u3067\u3001\u305d\u308c\u306b\u5408\u308f\u305b\u307e\u3057\u305f\u3002<\/li>\n<li> \u8272\u7a7a\u9593\u3092\u5206\u5272\u3059\u308b\u969b\u306b\u3001\u7acb\u65b9\u4f53\u304c\u7d30\u304b\u304f\u306a\u308a\u904e\u304e\u306a\u3044\u3088\u3046\u6df1\u3055\u3092\u6291\u3048\u305f\u308a\u3001\u8272\u3092\u5272\u308a\u5f53\u3066\u76f4\u3059\u969b\u306b\u3082\u8fd1\u3044\u8272\u3092\u52b9\u7387\u7684\u306b\u63a2\u3059\u51e6\u7406\u306a\u3069\u3001\u8aac\u660e\u3092\u7701\u7565\u3057\u305f\u9762\u767d\u3044\u90e8\u5206\u304c\u7d50\u69cb\u3042\u308a\u307e\u3059\u3002<\/li>\n<li> \u30c7\u30a3\u30b6\u30ea\u30f3\u30b0\u306e\u8aac\u660e\u3067\u6c17\u4ed8\u304f\u3068\u601d\u3044\u307e\u3059\u304c\u3001\u524a\u9664\u5bfe\u8c61\u306e\u8272\u3092\u5225\u306e\u8272\u306b\u66f8\u304d\u66ff\u3048\u308b\u969b\u306b\u3001\u4e00\u3064\u306e\u8272\u306b\u306a\u308b\u3068\u306f\u9650\u308a\u307e\u305b\u3093\u3002\u3067\u3059\u306e\u3067\u3001\u30d1\u30ec\u30c3\u30c8\u304b\u3089\u30d1\u30ec\u30c3\u30c8\u3078\u306e\u5358\u7d14\u306a\u5199\u50cf\u3067\u306f\u306a\u304f\u3001\u30d3\u30c3\u30c8\u30de\u30c3\u30d7\u306e\u30d4\u30af\u30bb\u30eb\u6bce\u306b\u8272\u306e\u66f4\u65b0\u3092\u884c\u3044\u307e\u3059\u3002<\/li>\n<li> RGB \u8272\u7a7a\u9593\u306e\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u4f5c\u6210\u624b\u9806\u306f\u3001ImageMagick \u306e\u6e1b\u8272\u51e6\u7406\u306b printf \u3092\u4ed5\u8fbc\u307f\u3001\u305d\u306e\u6587\u5b57\u5217\u3092 PHP \u3067\u53d7\u3051\u53d6\u3063\u3066 OpenGL extension \u3092\u901a\u3057 X11 \u3067\u63cf\u753b\u3001\u30b9\u30af\u30ea\u30fc\u30f3\u304b\u3089 RGB \u914d\u5217\u306b\u843d\u3068\u3057\u3066 GD extension \u3067 PNG \u306e\u9759\u6b62\u753b\u306b\u4fdd\u5b58\u3002\u6700\u5f8c\u306b ffmpeg \u3067 MP4 \u52d5\u753b\u306b\u5909\u63db\u3002\u7c21\u5358\u3067\u3059\u306d\uff01<\/li>\n<\/ul>\n<h3 id=\"hs_eefcf37d1805efe15091d53149081883_header_12\"> \u6700\u5f8c\u306b<\/h3>\n<p>\u3055\u3066\u3001\u3053\u3053\u307e\u3067\u304c<strong>\u524d\u7f6e\u304d<\/strong>\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u6b21\u56de\u3001ImageMagick \u6e1b\u8272\u51e6\u7406\u306e\u6539\u9020\u306b\u3064\u3044\u3066\u304a\u8a71\u3057\u307e\u3059\u3002\u305d\u308c\u3067\u306f\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u3053\u3093\u306b\u3061\u306f\u3002\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u57fa\u76e4\u30c1\u30fc\u30e0\u306e\u3088\u3084\u3067\u3059\u3002 \u30a2\u30d0\u30bf\u30fc\u7b49\u3092\u8868\u793a\u3059\u308b\u70ba\u306b PNG \u3084 JPEG \u306e\u753b\u50cf\u3092\u5143\u306b GIF \u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u3092\u751f\u6210\u3059\u308b\u4e8b\u304c\u3088\u304f\u3042\u308a\u307e\u3059\u304c\u3001GIF \u306f 256\u8272\u307e\u3067\u3057\u304b\u6271\u3048\u306a\u3044\u70ba\u3001\u5143\u753b\u50cf\u304c\u6570\u4e07\u3068\u3044\u3063 [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[9],"tags":[23],"class_list":["post-4824","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-info","tag-image"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/labs.gree.jp\/blog\/wp-json\/wp\/v2\/posts\/4824","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/labs.gree.jp\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/labs.gree.jp\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/labs.gree.jp\/blog\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/labs.gree.jp\/blog\/wp-json\/wp\/v2\/comments?post=4824"}],"version-history":[{"count":3,"href":"https:\/\/labs.gree.jp\/blog\/wp-json\/wp\/v2\/posts\/4824\/revisions"}],"predecessor-version":[{"id":21163,"href":"https:\/\/labs.gree.jp\/blog\/wp-json\/wp\/v2\/posts\/4824\/revisions\/21163"}],"wp:attachment":[{"href":"https:\/\/labs.gree.jp\/blog\/wp-json\/wp\/v2\/media?parent=4824"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/labs.gree.jp\/blog\/wp-json\/wp\/v2\/categories?post=4824"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/labs.gree.jp\/blog\/wp-json\/wp\/v2\/tags?post=4824"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}