{"id":204,"date":"2017-11-10T15:54:10","date_gmt":"2017-11-10T07:54:10","guid":{"rendered":"https:\/\/www.myway5.com\/?p=204"},"modified":"2023-07-05T21:56:05","modified_gmt":"2023-07-05T13:56:05","slug":"png","status":"publish","type":"post","link":"https:\/\/www.myway5.com\/index.php\/2017\/11\/10\/png\/","title":{"rendered":"png\u683c\u5f0f\u5206\u6790\u4e0e\u538b\u7f29\u539f\u7406"},"content":{"rendered":"<h2>1.\u7b80\u4ecb<\/h2>\n<p>\u3000png\u56fe\u7247\u683c\u5f0f\u91c7\u7528\u4e86\u4e00\u79cd\u5f88\u7075\u6d3b\u7684\u7f16\u7801\u8bbe\u8ba1\uff0c\u652f\u6301\u591a\u79cd\u7f16\u7801\u65b9\u5f0f\u6765\u5c55\u793a\u4e00\u5f20\u56fe\u7247\uff1a\u7070\u5ea6\u56fe\u7247\u3001\u7d22\u5f15\u5f69\u8272\u56fe\u50cf\u3001\u771f\u5f69\u8272\u56fe\u50cf\u3001\u5e26\u03b1\u901a\u9053\u6570\u636e\u7684\u7070\u5ea6\u56fe\u50cf\u3001\u5e26\u03b1\u901a\u9053\u6570\u636e\u7684\u771f\u5f69\u8272\u56fe\u50cf\u3002\u56e0\u4e3apng\u7684\u7f16\u7801\u65b9\u5f0f\u7075\u6d3b\uff0c\u4f7f\u5f97\u5176\u538b\u7f29\u7684\u53d1\u6325\u7a7a\u95f4\u975e\u5e38\u5927\u3002<\/p>\n<h2>2.\u51e0\u79cd\u7f16\u7801\u65b9\u5f0f\u7684\u8bf4\u660e<\/h2>\n<p><code>\u6ce8\u610f\uff1a\u8fd9\u91cc\u7684\u4e00\u4e2a\u901a\u9053\u5e76\u4e0d\u7b49\u540c\u4e8e1\u4e2a\u5b57\u8282\u62162\u4e2a\u5b57\u8282\uff0c\u56e0\u4e3apng IDAT\u5757\u7684\u7f16\u7801\u5355\u4f4d\u662fbit\u800c\u4e0d\u662fbyte\uff0c\u5177\u4f53\u4e00\u4e2a\u901a\u9053\u5360\u7528\u7684\u4f4d\u6570\u662f\u9760bit depth\u6765\u51b3\u5b9a\u7684<\/code><\/p>\n<h3>a.\u7070\u5ea6\u56fe\u7247<\/h3>\n<p>\u7070\u5ea6\u56fe\u7247\u4e00\u822c\u662f\u7528\u6765\u751f\u6210\u6211\u4eec\u5e38\u89c1\u7684\u9ed1\u767d\u7167\u7247\uff0c<code>bit depth\u53ef\u9009\u503c\u4e3a1\u3001 2\u3001 4\u3001 8\u300116<\/code>\uff0c\u5176\u4e00\u4e2a\u50cf\u7d20\u70b9\u7528\u4e00\u4e2a\u901a\u9053\u6765\u8868\u793a\uff080~255\uff09\u6216(0~65535)\uff0c\u56e0\u6b64\u8fd9\u79cd\u56fe\u7247\u7684\u5927\u5c0f\u5f80\u5f80\u975e\u5e38\u5c0f<\/p>\n<h3>b.\u7d22\u5f15\u5f69\u8272\u56fe\u50cf<\/h3>\n<p>\u7d22\u5f15\u5f69\u8272\u56fe\u50cf\u5f88\u6709\u610f\u601d\uff0c\u5b83\u53ef\u4ee5\u548c\u771f\u5f69\u8272\u56fe\u50cf\u4e00\u6837\u62e5\u6709\u8868\u8fbe\u5f69\u8272\u56fe\u7247\u7684\u80fd\u529b\uff0c\u4f46\u662f\u4e00\u5f20\u7d22\u5f15\u5f69\u8272\u56fe\u50cf\u4e0a\u6700\u591a\u53ea\u6709256\u79cd\u989c\u8272\uff0c\u6bcf\u79cd\u989c\u8272\u7528\u4e09\u4e2a\u5b57\u8282(RGB,0~255)\u8868\u793a\u3002<code>\u5b83\u7684bit depth\u53ef\u9009\u503c\u4e3a1\u3001 2\u30014\u30018<\/code>\uff0c\u5b83\u6709\u4e00\u4e2a\u8c03\u8272\u677f\u533a\u57df\uff0c\u7528\u6765\u8bb0\u5f55\u7d22\u5f15\u989c\u8272\u7684\u503c\uff0c\u7136\u540e\u50cf\u7d20\u70b9\u6570\u636e\u533a\u57df\u7528\u4e00\u4e2a\u901a\u9053(0~255)\u6765\u8868\u793a\u8c03\u8272\u677f\u533a\u57df\u8bb0\u5f55\u7684\u989c\u8272\u7d22\u5f15\u3002\u6240\u4ee5\u5bf9\u4e8e\u8272\u5f69\u4e0d\u591a\u7684\u56fe\u7247\u6765\u8bf4\uff0c\u91c7\u7528\u7d22\u5f15\u5f69\u8272\u6765\u7f16\u7801\u662f\u5f88\u9002\u5408\u7684\u3002<\/p>\n<h3>c.\u771f\u5f69\u8272\u56fe\u50cf<\/h3>\n<p>\u771f\u5f69\u8272\u56fe\u50cf\u6700\u597d\u7406\u89e3\uff0c<code>\u5b83\u7684bit depth\u4e3a8\u621616<\/code>\uff0c\u5b83\u7684\u6bcf\u4e2a\u50cf\u7d20\u70b9\u90fd\u75283\u4e2a\u5b57\u8282(3\u4e2a\u901a\u9053\uff09\u6765\u8868\u793a\uff0c\u5206\u522b\u4e3aR(0~255),G(0~255),B(0~255)\uff0c\u53ef\u4ee5\u8868\u8fbe256<em>256<\/em>256=16777216\u79cd\u989c\u8272\uff0c\u6216\u8005\u4f7f\u75286\u4e2a\u5b57\u8282\uff083\u4e2a\u901a\u9053\uff09\u6765\u8868\u793a\uff0c\u5206\u522b\u4e3aR(0~65535),G(0~65535),B(0~65535)\uff0c\u53ef\u4ee5\u8868\u8fbe65535<em>65535<\/em>65535\u79cd\u989c\u8272\u3002<\/p>\n<h3>d.\u5e26\u03b1\u901a\u9053\u6570\u636e\u7684\u7070\u5ea6\u56fe\u50cf<\/h3>\n<p>\u5c31\u662f\u5728\u7070\u5ea6\u56fe\u7247\u4e0a\u589e\u52a0\u4e86\u03b1\u901a\u9053\uff0c\u51712\u4e2a\u901a\u9053,\u652f\u6301\u900f\u660e(0~255)\u6216\u8005(0~65535)\uff0c<code>\u4f46\u662f\u5b83\u7684bit depth\u4e3a8\u621616<\/code>\uff0c\u56e0\u6b64\u8fd9\u79cd\u7f16\u7801\u65b9\u5f0f\u4e00\u4e2a\u50cf\u7d20\u70b9\u662f2\u4e2a\u5b57\u8282\u62164\u4e2a\u5b57\u8282<\/p>\n<h3>e.\u5e26\u03b1\u901a\u9053\u6570\u636e\u7684\u771f\u5f69\u8272\u56fe\u50cf<\/h3>\n<p>\u5c31\u662f\u5728\u771f\u5f69\u8272\u56fe\u50cf\u4e0a\u589e\u52a0\u4e86\u03b1\u901a\u9053,\u540c\u56db\u4e2a\u901a\u9053\uff0c\u652f\u6301\u900f\u660e(0~255)\u6216\u8005(0~65535)\uff0c<code>\u5b83\u7684bit depth\u4e3a8\u621616<\/code>\uff0c\u56e0\u6b64\u8fd9\u79cd\u7f16\u7801\u65b9\u5f0f\u4e00\u4e2a\u50cf\u7d20\u70b9\u662f4\u4e2a\u5b57\u8282\u62168\u4e2a\u5b57\u8282<\/p>\n<h2>3.png\u56fe\u7247\u5177\u4f53\u7f16\u7801\u8bf4\u660e<\/h2>\n<p>png\u56fe\u7247\u7684\u7f16\u7801\u4e00\u822c\u5982\u4e0b:header,chunk,chunk,chunk&#8230;.chunk\u3002<\/p>\n<p><code>header<\/code>\u4ee3\u8868png\u56fe\u7247\u7684\u5934\uff0cpng\u6587\u4ef6\u5934\u4e00\u822c\u90fd\u662f\u7531\u56fa\u5b9a\u76848\u4e2a\u5b57\u8282\u7ec4\u6210<br \/>\n<code>89 50 4E 47 OD 0A 1A 0A<\/code><br \/>\n\u56fe\u7247\u8f6f\u4ef6\u53ef\u4ee5\u901a\u8fc7\u8fd98\u4e2a\u5b57\u8282\u6765\u5224\u65ad\u8fd9\u4e2a\u6587\u4ef6\u662f\u4e0d\u662fpng\u683c\u5f0f\u3002<\/p>\n<p><code>chunk<\/code>\u4ee3\u8868png\u56fe\u7247\u7684\u6570\u636e\u5757\uff0c\u6570\u636e\u5757\u662f\u6709\u4e0d\u540c\u7684\u7c7b\u578b\u7684\uff0c\u8bb0\u5f55\u4e86\u4e0d\u540c\u7684\u4fe1\u606f\u3002\u4e00\u5f20png\u56fe\u7247\u53ef\u80fd\u5305\u542b\u591a\u4e2a\u6570\u636e\u5757\u3002<br \/>\n\u6570\u636e\u5757\u7684\u7c7b\u578b\u5982\u4e0b\uff08\u5173\u952e\u90e8\u5206\u9ad8\u4eae\u663e\u793a\uff09:<\/p>\n<p><strong>PNG\u6587\u4ef6\u683c\u5f0f\u4e2d\u7684\u6570\u636e\u5757\uff08\u88681.1\uff09<\/strong><\/p>\n<table>\n<thead>\n<tr>\n<th align=\"left\">\u6570\u636e\u5757\u7b26\u53f7<\/th>\n<th align=\"left\">\u6570\u636e\u5757\u540d\u79f0<\/th>\n<th align=\"left\">\u591a\u6570\u636e\u5757<\/th>\n<th align=\"left\">\u53ef\u9009\u5426<\/th>\n<th align=\"left\">\u4f4d\u7f6e\u9650\u5236<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td align=\"left\"><code>IHDR<\/code><\/td>\n<td align=\"left\">\u6587\u4ef6\u5934\u6570\u636e\u5757<\/td>\n<td align=\"left\">\u5426<\/td>\n<td align=\"left\">\u5426<\/td>\n<td align=\"left\">\u7b2c\u4e00\u5757<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">cHRM<\/td>\n<td align=\"left\">\u57fa\u8272\u548c\u767d\u8272\u70b9\u6570\u636e\u5757<\/td>\n<td align=\"left\">\u5426<\/td>\n<td align=\"left\">\u662f<\/td>\n<td align=\"left\">\u5728PLTE\u548cIDAT\u4e4b\u524d<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">gAMA<\/td>\n<td align=\"left\">\u56fe\u50cf\u03b3\u6570\u636e\u5757<\/td>\n<td align=\"left\">\u5426<\/td>\n<td align=\"left\">\u662f<\/td>\n<td align=\"left\">\u5728PLTE\u548cIDAT\u4e4b\u524d<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">sBIT<\/td>\n<td align=\"left\">\u6837\u672c\u6709\u6548\u4f4d\u6570\u636e\u5757<\/td>\n<td align=\"left\">\u5426<\/td>\n<td align=\"left\">\u662f<\/td>\n<td align=\"left\">\u5728PLTE\u548cIDAT\u4e4b\u524d<\/td>\n<\/tr>\n<tr>\n<td align=\"left\"><code>PLTE<\/code><\/td>\n<td align=\"left\">\u8c03\u8272\u677f\u6570\u636e\u5757<\/td>\n<td align=\"left\">\u5426<\/td>\n<td align=\"left\">\u662f<\/td>\n<td align=\"left\">\u5728IDAT\u4e4b\u524d<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">bKGD<\/td>\n<td align=\"left\">\u80cc\u666f\u989c\u8272\u6570\u636e\u5757<\/td>\n<td align=\"left\">\u5426<\/td>\n<td align=\"left\">\u662f<\/td>\n<td align=\"left\">\u5728PLTE\u4e4b\u540eIDAT\u4e4b\u524d<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">hIST<\/td>\n<td align=\"left\">\u56fe\u50cf\u76f4\u65b9\u56fe\u6570\u636e\u5757<\/td>\n<td align=\"left\">\u5426<\/td>\n<td align=\"left\">\u662f<\/td>\n<td align=\"left\">\u5728PLTE\u4e4b\u540eIDAT\u4e4b\u524d<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">tRNS<\/td>\n<td align=\"left\">\u56fe\u50cf\u900f\u660e\u6570\u636e\u5757<\/td>\n<td align=\"left\">\u5426<\/td>\n<td align=\"left\">\u662f<\/td>\n<td align=\"left\">\u5728PLTE\u4e4b\u540eIDAT\u4e4b\u524d<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">oFFs<\/td>\n<td align=\"left\">(\u4e13\u7528\u516c\u5171\u6570\u636e\u5757)<\/td>\n<td align=\"left\">\u5426<\/td>\n<td align=\"left\">\u662f<\/td>\n<td align=\"left\">\u5728IDAT\u4e4b\u524d<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">pHYs<\/td>\n<td align=\"left\">\u7269\u7406\u50cf\u7d20\u5c3a\u5bf8\u6570\u636e\u5757<\/td>\n<td align=\"left\">\u5426<\/td>\n<td align=\"left\">\u662f<\/td>\n<td align=\"left\">\u5728IDAT\u4e4b\u524d<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">sCAL<\/td>\n<td align=\"left\">(\u4e13\u7528\u516c\u5171\u6570\u636e\u5757)<\/td>\n<td align=\"left\">\u5426<\/td>\n<td align=\"left\">\u662f<\/td>\n<td align=\"left\">\u5728IDAT\u4e4b\u524d<\/td>\n<\/tr>\n<tr>\n<td align=\"left\"><code>IDAT<\/code><\/td>\n<td align=\"left\">\u56fe\u50cf\u6570\u636e\u5757<\/td>\n<td align=\"left\">\u662f<\/td>\n<td align=\"left\">\u5426<\/td>\n<td align=\"left\">\u4e0e\u5176\u4ed6IDAT\u8fde\u7eed<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">tIME<\/td>\n<td align=\"left\">\u56fe\u50cf\u6700\u540e\u4fee\u6539\u65f6\u95f4\u6570\u636e\u5757<\/td>\n<td align=\"left\">\u5426<\/td>\n<td align=\"left\">\u662f<\/td>\n<td align=\"left\">\u65e0\u9650\u5236<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">tEXt<\/td>\n<td align=\"left\">\u6587\u672c\u4fe1\u606f\u6570\u636e\u5757<\/td>\n<td align=\"left\">\u662f<\/td>\n<td align=\"left\">\u662f<\/td>\n<td align=\"left\">\u65e0\u9650\u5236<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">zTXt<\/td>\n<td align=\"left\">\u538b\u7f29\u6587\u672c\u6570\u636e\u5757<\/td>\n<td align=\"left\">\u662f<\/td>\n<td align=\"left\">\u662f<\/td>\n<td align=\"left\">\u65e0\u9650\u5236<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">fRAc<\/td>\n<td align=\"left\">(\u4e13\u7528\u516c\u5171\u6570\u636e\u5757)<\/td>\n<td align=\"left\">\u662f<\/td>\n<td align=\"left\">\u662f<\/td>\n<td align=\"left\">\u65e0\u9650\u5236<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">gIFg<\/td>\n<td align=\"left\">(\u4e13\u7528\u516c\u5171\u6570\u636e\u5757)<\/td>\n<td align=\"left\">\u662f<\/td>\n<td align=\"left\">\u662f<\/td>\n<td align=\"left\">\u65e0\u9650\u5236<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">gIFt<\/td>\n<td align=\"left\">(\u4e13\u7528\u516c\u5171\u6570\u636e\u5757)<\/td>\n<td align=\"left\">\u662f<\/td>\n<td align=\"left\">\u662f<\/td>\n<td align=\"left\">\u65e0\u9650\u5236<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">gIFx<\/td>\n<td align=\"left\">(\u4e13\u7528\u516c\u5171\u6570\u636e\u5757)<\/td>\n<td align=\"left\">\u662f<\/td>\n<td align=\"left\">\u662f<\/td>\n<td align=\"left\">\u65e0\u9650\u5236<\/td>\n<\/tr>\n<tr>\n<td align=\"left\"><code>IEND<\/code><\/td>\n<td align=\"left\">\u56fe\u50cf\u7ed3\u675f\u6570\u636e<\/td>\n<td align=\"left\">\u5426<\/td>\n<td align=\"left\">\u5426<\/td>\n<td align=\"left\">\u6700\u540e\u4e00\u4e2a\u6570\u636e\u5757<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>png \u6587\u4ef6\u4e2d\uff0c\u6bcf\u4e2a\u6570\u636e\u5757\u75314\u4e2a\u90e8\u5206\u7ec4\u6210 length | type(name) | data | CRC, \u8bf4\u660e\u5982\u4e0b<\/p>\n<p>length: 4 bytes\uff0c data\u7684\u957f\u5ea6\uff0c\u4e0d\u5305\u62ectype\u548cCRC<br \/>\ntype: 4 bytes, ASCII\u7801([A-Z,a-z])<br \/>\nCRC: 4bytes<br \/>\nCRC(cyclic redundancy check)\u57df\u4e2d\u7684\u503c\u662f\u5bf9Chunk Type Code\u57df\u548cChunk Data\u57df\u4e2d\u7684\u6570\u636e\u8fdb\u884c\u8ba1\u7b97\u5f97\u5230\u7684\u3002CRC\u5177\u4f53\u7b97\u6cd5\u5b9a\u4e49\u5728ISO 3309\u548cITU-T V.42\u4e2d\uff0c\u5176\u503c\u6309\u4e0b\u9762\u7684CRC\u7801\u751f\u6210\u591a\u9879\u5f0f\u8fdb\u884c\u8ba1\u7b97\uff1a <code>x32+x26+x23+x22+x16+x12+x11+x10+x8+x7+x5+x4+x2+x+1<\/code><\/p>\n<p>\u9664\u4e86\u9ad8\u4eae\u7684\u5173\u952e\u6570\u636e\u5757\uff0c\u8fd8\u6709\u4e0b\u9762\u6bd4\u8f83\u6709\u610f\u601d\u7684\u6570\u636e\u5757<br \/>\n<strong>tRNS<\/strong><\/p>\n<blockquote><p>\n  tRNS contains transparency information. For indexed images, it stores alpha channel values for one or more palette entries. For truecolor and grayscale images, it stores a single pixel value that is to be regarded as fully transparent.\n<\/p><\/blockquote>\n<p>tRNS\u5305\u542b\u900f\u660e\u5ea6\u4fe1\u606f\uff0c<br \/>\n1.\u5728\u7d22\u5f15\u56fe\u7247\u4e2d\uff0c\u5b83\u53ef\u4ee5\u4fdd\u5b58\u4e00\u6216\u591a\u4e2a\u8c03\u8272\u677f\u50cf\u7d20\u5bf9\u7684alpha\u901a\u9053\u503c\u3002\u7528\u6765\u6307\u660e\u54ea\u4e9b\u50cf\u7d20\u9700\u8981\u900f\u660e\uff0c\u900f\u660e\u5ea6\u662f\u591a\u5c11\u3002\u7136\u540e\u5269\u4e0b\u7684\u50cf\u7d20\u900f\u660e\u5ea6\u90fd\u88ab\u9ed8\u8ba4\u6210255\uff0c\u5b8c\u5168\u4e0d\u900f\u660e\u3002<\/p>\n<p>2.\u5728\u7070\u5ea6\u56fe\u7247\u4e2d\uff0c\u5305\u542b\u5355\u4e2a\u7070\u5ea6\u7ea7\u522b\u503c\uff0c\u683c\u5f0f\u5982\u4e0b\uff1a<br \/>\nGray:  2 bytes, range 0 .. (2^bitdepth)-1<br \/>\n\u88ab\u6307\u5b9a\u7684\u7070\u5ea6\u503c\u90fd\u4f1a\u88ab\u5f53\u6210\u662f\u900f\u660e\u7684\uff0c\u5176\u4ed6\u7070\u5ea6\u503c\u5219\u5b8c\u5168\u4e0d\u900f\u660e\uff08\u5982\u679cbit depth\u5c0f\u4e8e16\uff0c\u5219\u53d6\u6700\u4f4e\u6709\u6548\u4f4d\uff0c\u5176\u4ed6\u4f4d\u4e3a0\uff09<\/p>\n<p>3.\u5728\u771f\u5f69\u8272\u56fe\u7247\u4e2d\uff0c\u5305\u542b\u5355\u4e2aRGB\u989c\u8272\u503c\uff0c\u683c\u5f0f\u5982\u4e0b\uff1a<br \/>\nRed:   2 bytes, range 0 .. (2^bitdepth)-1<br \/>\nGreen: 2 bytes, range 0 .. (2^bitdepth)-1<br \/>\nBlue:  2 bytes, range 0 .. (2^bitdepth)-1<br \/>\n\u88ab\u6307\u5b9a\u7684\u989c\u8272\u503c\u90fd\u4f1a\u88ab\u5f53\u6210\u662f\u900f\u660e\u7684\uff0c\u5176\u4ed6\u989c\u8272\u503c\u5219\u5b8c\u5168\u4e0d\u900f\u660e\uff08\u5982\u679cbit depth\u5c0f\u4e8e16\uff0c\u5219\u53d6\u6700\u4f4e\u6709\u6548\u4f4d\uff0c\u5176\u4ed6\u4f4d\u4e3a0\uff09<\/p>\n<p>\u5728\u5e26alpha\u901a\u9053\u7684\u56fe\u7247\u4e2d\uff0ctRNS\u662f\u88ab\u7981\u6b62\u4f7f\u7528\u7684\u3002<\/p>\n<h3>a.IHDR\u6570\u636e\u5757<\/h3>\n<p>IHDR\u6570\u636e\u5757\u5b58\u50a8\u4e86png\u56fe\u50cf\u7684\u57fa\u672c\u4fe1\u606f\uff0c\u4e00\u4e2a\u56fe\u50cf\u4e2d\u53ea\u80fd\u6709\u4e00\u4e2aIHDR\u6570\u636e\u5757\uff0c\u5e76\u4e14\u4e5f\u662fpng\u56fe\u50cf\u7684\u7b2c\u4e00\u4e2a\u6570\u636e\u5757\u3002\u5171\u670913\u4e2a\u5b57\u8282\u3002\u8bb0\u5f55\u7684\u4fe1\u606f\u5982\u4e0b\uff1a<\/p>\n<p><strong>\u88681.2<\/strong><\/p>\n<table>\n<thead>\n<tr>\n<th align=\"left\">\u57df\u7684\u540d\u79f0<\/th>\n<th align=\"left\">\u5b57\u8282\u6570<\/th>\n<th align=\"left\">\u8bf4\u660e<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td align=\"left\">Width<\/td>\n<td align=\"left\">4 bytes<\/td>\n<td align=\"left\">\u56fe\u50cf\u5bbd\u5ea6\uff0c\u4ee5\u50cf\u7d20\u4e3a\u5355\u4f4d<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">Height<\/td>\n<td align=\"left\">4 bytes<\/td>\n<td align=\"left\">\u56fe\u50cf\u9ad8\u5ea6\uff0c\u4ee5\u50cf\u7d20\u4e3a\u5355\u4f4d<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">Bit depth<\/td>\n<td align=\"left\">1 byte<\/td>\n<td align=\"left\">\u56fe\u50cf\u6df1\u5ea6.<code>\u7d22\u5f15\u5f69\u8272\u56fe\u50cf\uff1a 1\uff0c2\uff0c4\u62168 ,<\/code> <code>\u7070\u5ea6\u56fe\u50cf\uff1a 1\uff0c2\uff0c4\uff0c8\u621616<\/code> <code>\u771f\u5f69\u8272\u56fe\u50cf\uff1a 8\u621616<\/code><\/td>\n<\/tr>\n<tr>\n<td align=\"left\">ColorType<\/td>\n<td align=\"left\">1 byte<\/td>\n<td align=\"left\">\u989c\u8272\u7c7b\u578b. <code>[0]\uff1a\u7070\u5ea6\u56fe\u50cf, 1\uff0c2\uff0c4\uff0c8\u621616<\/code> <code>[2]\uff1a\u771f\u5f69\u8272\u56fe\u50cf\uff0c8\u621616<\/code> <code>[3]\uff1a\u7d22\u5f15\u5f69\u8272\u56fe\u50cf\uff0c1\uff0c2\uff0c4\u62168<\/code> <code>[4]\uff1a\u5e26\u03b1\u901a\u9053\u6570\u636e\u7684\u7070\u5ea6\u56fe\u50cf\uff0c8\u621616<\/code> <code>[6]\uff1a\u5e26\u03b1\u901a\u9053\u6570\u636e\u7684\u771f\u5f69\u8272\u56fe\u50cf\uff0c8\u621616<\/code><\/td>\n<\/tr>\n<tr>\n<td align=\"left\">Compression method<\/td>\n<td align=\"left\">1 byte<\/td>\n<td align=\"left\">\u538b\u7f29\u65b9\u6cd5(LZ77\u6d3e\u751f\u7b97\u6cd5)<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">Filter method<\/td>\n<td align=\"left\">1 byte<\/td>\n<td align=\"left\">\u6ee4\u6ce2\u5668\u65b9\u6cd5<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">Interlace method<\/td>\n<td align=\"left\">1 byte<\/td>\n<td align=\"left\">\u9694\u884c\u626b\u63cf\u65b9\u6cd5. <code>0\uff1a\u975e\u9694\u884c\u626b\u63cf<\/code> <code>1\uff1a Adam7(\u7531Adam M. Costello\u5f00\u53d1\u76847\u904d\u9694\u884c\u626b\u63cf\u65b9\u6cd5)<\/code><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u4ece\u8fd9\u4e2a\u8868\u4e2d\u53ef\u4ee5\u5f97\u51fa\uff0c\u4e00\u5f20png\u56fe\u7247\u6700\u5927\u7684\u5bbd\u9ad8\uff084294967300 \u00d7 4294967300\uff09<\/p>\n<p>\u8fd9\u91cc\u7684Bit depth\u4e00\u5f00\u59cb\u5f88\u96be\u7406\u89e3\uff0c\u5f15\u7528\u7ef4\u57fa\u767e\u79d1\u4e24\u6bb5\u8bdd\uff1a<\/p>\n<blockquote><p>\n  Pixels in PNG images are numbers that may be either indices of sample data in the palette or the sample data itself. The palette is a separate table contained in the PLTE chunk. Sample data for a single pixel consists of a tuple of between one and four numbers. Whether the pixel data represents palette indices or explicit sample values, the numbers are referred to as channels and every number in the image is encoded with an identical format.<\/p>\n<p>  The permitted formats encode each number as an unsigned integral value using a fixed number of bits, referred to in the PNG specification as the bit depth. Notice that this is not the same as color depth, which is commonly used to refer to the total number of bits in each pixel, not each channel. The permitted bit depths are summarized in the table along with the total number of bits used for each pixel.<\/p>\n<p>  The number of channels depends on whether the image is grayscale or color and whether it has an alpha channel. PNG allows the following combinations of channels, called the color type.\n<\/p><\/blockquote>\n<p>\u5927\u610f\u662f\uff1apng\u56fe\u7247\u7684\u50cf\u7d20(Pixels)\u662f\u8c03\u8272\u677f\u4e2d\u6837\u672c\u6570\u636e\u7684\u7d22\u5f15\u6216\u8005\u6837\u672c\u6570\u636e\u5176\u672c\u8eab\uff0c\u8c03\u8272\u677f\u662f\u5728PLTE\u6570\u636e\u5757\u4e2d\u7684\u3002\u5355\u4e2a\u50cf\u7d20\u7684\u6837\u672c\u6570\u636e\u5305\u542b1~4\u4e2a\u6570\u5b57\u7684\u5143\u7ec4\u3002\u50cf\u7d20\u6570\u636e\u8868\u793a\u8c03\u8272\u677f\u7d22\u5f15\u6216\u8005\u660e\u786e\u7684\u6837\u672c\u503c\uff0c\u6bcf\u4e2a\u6570\u5b57\u4ee3\u8868\u6bcf\u4e2a\u901a\u9053\uff0c\u6bcf\u4e2a\u6570\u5b57\u90fd\u6709\u552f\u4e00\u53ef\u8bc6\u522b\u7684\u7f16\u7801\u3002<\/p>\n<p>\u5141\u8bb8\u7f16\u7801\u6bcf\u4e2a\u6570\u5b57\u7684\u683c\u5f0f\u662f\u4e00\u4e2a\u4f7f\u7528\u56fa\u5b9a\u4f4d\u6570\u7684unsigned\u6574\u6570\u503c\uff0c\u5728PNG\u4e2d\u79f0\u4e3abit depth(\u4f4d\u6df1)\u3002\u4f4d\u6df1\u548ccolor depth(\u989c\u8272\u6df1\u5ea6)\u4e0d\u540c\uff0c\u989c\u8272\u6df1\u5ea6\u901a\u5e38\u4ee3\u8868\u4e00\u4e2a\u50cf\u7d20\u7684\u603b\u4f4d\u6570\uff0c\u4e0d\u662f\u6bcf\u4e2a\u901a\u9053\u7684\u603b\u4f4d\u6570\u3002<\/p>\n<p>\u901a\u9053\u6570\u53d6\u51b3\u4e8e\u8fd9\u4e2a\u56fe\u7247\u662f\u5426\u662f\u7070\u5ea6\u56fe\u8fd8\u662f\u6709alpha\u901a\u9053\u7684\u8272\u5f69\u56fe<\/p>\n<p><strong>\u56e0\u6b64\u53ef\u4ee5\u77e5\u9053bit depth\u662f\u4e00\u4e2a\u901a\u9053\u7684\u4f4d\u6570\uff0cbit depth\u5728\u7d22\u5f15\u5f69\u8272\u56fe\u7247\u548c\u7070\u5ea6\u56fe\u4e2d\u4f7f\u7528\uff0c\u4f7f\u5f97\u56fe\u7247\u7684\u4e00\u4e2a\u50cf\u7d20\u70b9\u7684\u5927\u5c0f\u53ef\u4ee5\u5c0f\u4e8e\u4e00\u4e2a\u5b57\u8282<\/strong><\/p>\n<h3>b.PLTE\u6570\u636e\u5757\uff08\u8c03\u8272\u677f\u6570\u636e\u5757\uff09<\/h3>\n<ul>\n<li>a.PLTE\u6570\u636e\u5757\u5728\u7d22\u5f15\u5f69\u8272\u56fe\u50cf\u4e2d<code>\u5fc5\u987b\u5b58\u5728<\/code>\uff0c\u8fd9\u91cc\u8bb0\u5f55\u4e86\u6574\u5f20\u56fe\u7247\u6240\u6709\u7684\u989c\u8272\uff0c\u6700\u591a\u4e3a256\u4e2a\u3002\u8fd9\u4e2a\u662fbit depth\u89c4\u5b9a\u7684\uff0c\u7531\u88681.2\u53ef\u77e5\uff0c\u7d22\u5f15\u5f69\u8272\u56fe\u50cf\u7684bit depth\u4e3a1,2,4,8\uff0c\u5171\u4e3a1\u30014\u300116\u3001256\u79cd\u989c\u8272\u3002\u6bcf\u79cd\u989c\u8272\u662f3\u4e2a\u5b57\u8282\uff08RGB)\uff0c\u6240\u4ee5PLTE\u6570\u636e\u5757\u7684length\u80af\u5b9a\u662f3\u7684\u500d\u6570\uff0c\u5426\u5219\u5c31\u662f\u975e\u6cd5\u7684\u3002<\/p>\n<\/li>\n<li>\n<p>b.PLTE\u6570\u636e\u5757\u5728\u771f\u5f69\u8272\u56fe\u50cf\u6216\u5e26\u03b1\u901a\u9053\u6570\u636e\u7684\u771f\u5f69\u8272\u56fe\u50cf\u4e2d\u662f<code>\u53ef\u9009\u7684<\/code><\/p>\n<\/li>\n<li>\n<p>c.PLTE\u6570\u636e\u5757\u5728\u7070\u5ea6\u56fe\u50cf\u6216\u5e26\u03b1\u901a\u9053\u6570\u636e\u7684\u7070\u5ea6\u56fe\u50cf\u4e2d\u662f<code>\u4e0d\u80fd\u5b58\u5728\u7684<\/code><\/p>\n<\/li>\n<\/ul>\n<h3>c.IDAT\u6570\u636e\u5757<\/h3>\n<p>\u8fd9\u90e8\u5206\u7684\u6570\u636e\u5757\u5b58\u653e\u7684\u5c31\u662f\u56fe\u50cf\u7684\u4e00\u4e2a\u4e2a\u50cf\u7d20\uff08\u4f7f\u7528\u538b\u7f29\u7b97\u6cd5\u4e4b\u540e\u751f\u6210\u7684\u50cf\u7d20\uff09\uff0c\u4e00\u5f20\u56fe\u50cf\u4e2d\u53ef\u4ee5\u5b58\u5728\u591a\u4e2aIDAT\u6570\u636e\u5757\uff0c\u8fd9\u79cd\u7f16\u7801\u65b9\u5f0f\u867d\u7136\u7a0d\u5fae\u589e\u52a0\u4e86\u56fe\u50cf\u7684\u5927\u5c0f\uff0c\u4f46\u662f\u53ef\u4ee5\u4f7f\u5f97PNG\u56fe\u50cf\u4ee5\u4e00\u79cd\u6d41\u7684\u65b9\u5f0f\u751f\u6210\u3002\u4f8b\u5982\u5728\u6d4f\u89c8\u5668\u4e2d\u6253\u5f00\u4e00\u5f20\u975e\u5e38\u5927\u7684PNG\u56fe\u50cf\uff0c\u5982\u679c\u7f51\u7edc\u5f88\u6162\uff0c\u6211\u4eec\u53ef\u4ee5\u770b\u5230\u56fe\u7247\u662f\u4ece\u4e0a\u5230\u4e0b\u4e00\u70b9\u70b9\u6253\u5f00\u7684\uff0c\u8fd9\u662f\u56e0\u4e3a\u5373\u4f7f\u6574\u5f20\u56fe\u7247\u6ca1\u6709\u52a0\u8f7d\u5b8c\uff0c\u4ecd\u7136\u53ef\u4ee5\u663e\u793a\u5c40\u90e8\u5185\u5bb9\u3002<\/p>\n<p>IDAT\u6570\u636e\u5757\u662f\u6700\u91cd\u8981\u7684\u4e00\u90e8\u5206\uff0c\u8fd9\u91cc\u7684\u6570\u636e\u4f1a\u88ab<code>\u9694\u884c\u626b\u63cf\u65b9\u6cd5(Interlace method)<\/code>\u3001<code>\u6ee4\u6ce2\u5668\uff08filtering\uff09<\/code>\u548c<code>\u538b\u7f29\u7b97\u6cd5(compression)<\/code>\u5904\u7406\u3002\u8fd9\u4e09\u4e2a\u90e8\u5206\u4f1a\u5728\u4e0b\u9762\u8be6\u7ec6\u4ecb\u7ecd\u3002<\/p>\n<p>\u5e76\u4e14\u8981\u6ce8\u610f\u7684\u662f\uff0cIDAT\u6570\u636e\u5757\u5b58\u50a8\u7684\u6570\u636e\u5e76\u4e0d\u662f\u4ee5\u5b57\u8282\u4e3a\u6700\u5c0f\u5355\u4f4d\uff0c\u5728\u7070\u5ea6\u56fe\u7247\u548c\u7d22\u5f15\u5f69\u8272\u56fe\u7247\u4e2d\uff0c\u4e00\u4e2a\u5b57\u8282\u53ef\u80fd\u4f1a\u5305\u542b\u591a\u4e2a\u50cf\u7d20\u70b9\uff0c\u7531bit depth\u6307\u5b9a\u3002<\/p>\n<h3>d.IENT\u6570\u636e\u5757<\/h3>\n<p>\u8fd9\u6bb5\u6570\u636e\u5757\u6807\u8bb0PNG\u6587\u4ef6\u6216\u8005\u6570\u636e\u6d41\u5df2\u7ecf\u7ed3\u675f\uff0c\u5e76\u4e14\u5fc5\u987b\u8981\u653e\u5728\u6587\u4ef6\u7684\u5c3e\u90e8\u3002<\/p>\n<p>\u6b63\u5e38\u60c5\u51b5\u4e0b\uff0c png \u6587\u4ef6\u7684\u7ed3\u5c3e\u4e3a\u5982\u4e0b12\u4e2a\u5b57\u7b26\uff1a<\/p>\n<p>00 00 00 00 49 45 4E 44 AE 42 60 82<br \/>\n\u7531\u4e8e\u6570\u636e\u5757\u7ed3\u6784\u7684\u5b9a\u4e49\uff0cIEND\u6570\u636e\u5757\u7684\u957f\u5ea6\u603b\u662f0\uff0800 00 00 00\uff0c\u9664\u975e\u4eba\u4e3a\u52a0\u5165\u4fe1\u606f\uff09\uff0c\u6570\u636e\u6807\u8bc6\u603b\u662fIEND\uff0849 45 4E 44\uff09\uff0c\u56e0\u6b64\uff0cCRC\u7801\u4e5f\u603b\u662fAE 42 60 82<\/p>\n<h2>4.\u9694\u884c\u626b\u63cf\u65b9\u6cd5<\/h2>\n<p>\u9694\u884c\u626b\u63cf\u65b9\u6cd5\u662f\u4e3a\u4e86\u56fe\u7247\u88ab\u66f4\u5148\u8fdb\u7684\u5c55\u793a\u51fa\u6765\u3002\u5728\u56fe\u7247\u4f20\u8f93\u8fc7\u7a0b\u4e2d\uff0c\u53ef\u4ee5\u8ba9\u56fe\u7247\u7684\u5c55\u793a\u6709\u6de1\u5165\u7684\u6548\u679c\u3002\u867d\u7136\u5e73\u5747\u4e0b\u6765\u7a0d\u5fae\u589e\u52a0\u4e86\u5b58\u50a8\u7684\u5927\u5c0f\uff0c\u4f46\u662f\u7ed9\u5e26\u6765\u7528\u6237\u66f4\u5feb\u7684\u663e\u793a\u6548\u679c\u3002<\/p>\n<ul>\n<li>a.\u8fd9\u4e2a\u65b9\u6cd5\u53d6\u503c\u4e3a0\u65f6\uff0c\u4ee3\u8868\u50cf\u7d20\u70b9\u662f\u4ece\u5de6\u5230\u53f3\u987a\u5e8f\u5b58\u50a8\uff0c\u626b\u63cf\u7ebf\u626b\u63cf\u65f6\u4ece\u4e0a\u5230\u4e0b\u5373\u53ef\u3002<\/li>\n<li>b.\u8fd9\u4e2a\u65b9\u6cd5\u53d6\u503c\u4e3a1\u65f6\uff0c\u88ab\u79f0\u4e3aAdam7\u7b97\u6cd5\n<p>Adam7\u5206\u4e3a7\u4e2a\u626b\u63cf\u6b65\u9aa4\uff0c\u53ef\u89c1\u4e0b\u56fe\uff1a<br \/>\n<img decoding=\"async\" src=\"https:\/\/www.myway5.com\/wp-content\/uploads\/2017\/11\/2017-11-10-15-18-37\u5c4f\u5e55\u622a\u56fe.png\" alt=\"\" \/><\/p>\n<h2>5.\u8fc7\u6ee4\u5668<\/h2>\n<p>\u8fc7\u6ee4\u5668\u4e2d\u53ea\u6709\u4e00\u79cd\u8fc7\u6ee4\u65b9\u6cd5\uff0c\u4f46\u662f\u6709\u591a\u79cd\u8fc7\u6ee4\u7c7b\u578b\u3002\u8fc7\u6ee4\u65b9\u6cd5\u5e76\u4e0d\u4f1a\u5f71\u54cd\u6570\u636e\u7684\u5927\u5c0f\uff0c\u4e5f\u4e0d\u4f1a\u5f71\u54cd\u4e22\u5931\u4efb\u4f55\u4fe1\u606f\uff0c\u8fc7\u6ee4\u7684\u76ee\u7684\u53ea\u6709\u4e00\u4e2a\uff0c\u4e3a\u538b\u7f29\u65b9\u6cd5\u63d0\u4f9b\u66f4\u597d\u538b\u7f29\u7684\u6570\u636e\uff0cIDAT\u6570\u636e\u4e2d\u7684\u6bcf\u4e00\u884c\u7b2c\u4e00\u4e2a\u5b57\u8282\u5b9a\u4e49\u4e86\u8fc7\u6ee4\u7c7b\u578b\uff0c\u8fc7\u6ee4\u7c7b\u578b\u7684\u4ecb\u7ecd\u5982\u4e0b:<\/p>\n<h3>a.\u8fc7\u6ee4\u7c7b\u578b0\uff1aNone<\/h3>\n<p>\u4e5f\u5c31\u662f\u4e0d\u505a\u4efb\u4f55\u8fc7\u6ee4<\/p>\n<h3>b. \u8fc7\u6ee4\u7c7b\u578b1\uff1aSub<\/h3>\n<p>\u8bb0\u5f55\u5f53\u524d\u50cf\u7d20\u548c\u5de6\u8fb9\u50cf\u7d20\u7684\u5dee\u503c\u3002\u5de6\u8fb9\u8d77\u7b2c\u4e00\u4e2a\u50cf\u7d20\u662f\u6807\u51c6\u503c\uff0c\u4e0d\u505a\u4efb\u4f55\u8fc7\u6ee4<\/p>\n<h3>c. \u8fc7\u6ee4\u7c7b\u578b2\uff1aUp<\/h3>\n<p>\u8bb0\u5f55X &#8211; B\u7684\u503c\uff0c\u5373\u5f53\u524d\u50cf\u7d20\u548c\u4e0a\u8fb9\u50cf\u7d20\u70b9\u5dee\u503c\u3002\u5982\u679c\u5f53\u524d\u884c\u662f\u7b2c1\u884c\uff0c\u5219\u5f53\u524d\u884c\u6570\u6807\u51c6\u503c\uff0c\u4e0d\u505a\u4efb\u4f55\u8fc7\u6ee4\u3002<\/p>\n<h3>d.\u8fc7\u6ee4\u7c7b\u578b3\uff1aAverage<\/h3>\n<p>\u8bb0\u5f55\u5f53\u524d\u50cf\u7d20\u4e0e\u5de6\u8fb9\u50cf\u7d20\u548c\u4e0a\u8fb9\u50cf\u7d20\u7684\u5e73\u5747\u503c\u7684\u5dee\u503c\u3002<\/p>\n<ul>\n<li>\u5982\u679c\u5f53\u524d\u884c\u6570\u7b2c\u4e00\u884c\uff1a\u505a\u7279\u6b8a\u7684Sub\u8fc7\u6ee4\uff0c\u5de6\u8fb9\u8d77\u7b2c\u4e00\u4e2a\u50cf\u7d20\u662f\u6807\u51c6\u503c\uff0c\u4e0d\u505a\u4efb\u4f55\u8fc7\u6ee4\u3002\u5176\u4ed6\u50cf\u7d20\u8bb0\u5f55\u8be5\u50cf\u7d20\u4e0e\u5de6\u8fb9\u50cf\u7d20\u7684\u4e8c\u5206\u4e4b\u4e00\u7684\u503c\u7684\u5dee\u503c\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\u5982\u679c\u5f53\u524d\u884c\u6570\u4e0d\u662f\u7b2c\u4e00\u884c\uff1a\u5de6\u8fb9\u8d77\u7b2c\u4e00\u4e2a\u50cf\u7d20\u8bb0\u5f55\u8be5\u50cf\u7d20\u4e0e\u4e0a\u8fb9\u50cf\u7d20\u7684\u4e8c\u5206\u4e4b\u4e00\u7684\u503c\u7684\u5dee\u503c\uff0c\u5176\u4ed6\u50cf\u7d20\u505a\u6b63\u5e38\u7684Average\u8fc7\u6ee4\u3002<br \/>\n<h3>e.\u8fc7\u6ee4\u7c7b\u578b4\uff1aPaeth<\/h3>\n<p>\u8bb0\u5f55X &#8211; Pr\u7684\u503c\uff0c\u8fd9\u79cd\u8fc7\u6ee4\u65b9\u5f0f\u6bd4\u8f83\u590d\u6742\uff0cPr\u7684\u8ba1\u7b97\u65b9\u5f0f\uff08\u4f2a\u4ee3\u7801\uff09\u5982\u4e0b\uff1a<\/p>\n<\/li>\n<\/ul>\n<pre><code class=\"line-numbers\">p = a + b - c\npa = abs(p - a)\npb = abs(p - b)\npc = abs(p - c)\nif pa &lt;= pb and pa &lt;= pc then Pr = a\nelse if pb &lt;= pc then Pr = b\nelse Pr = c\nreturn Pr\n<\/code><\/pre>\n<p>\u5982\u679c\u5f53\u524d\u884c\u6570\u7b2c\u4e00\u884c\uff1a\u505aSub\u8fc7\u6ee4\u3002<br \/>\n\u5982\u679c\u5f53\u524d\u884c\u6570\u4e0d\u662f\u7b2c\u4e00\u884c\uff1a\u5de6\u8fb9\u8d77\u7b2c\u4e00\u4e2a\u50cf\u7d20\u8bb0\u5f55\u8be5\u50cf\u7d20\u4e0e\u4e0a\u8fb9\u50cf\u7d20\u7684\u5dee\u503c\uff0c\u5176\u4ed6\u50cf\u7d20\u505a\u6b63\u5e38\u7684Peath\u8fc7\u6ee4\u3002<\/p>\n<h2>6.\u538b\u7f29\u7b97\u6cd5<\/h2>\n<p>\u538b\u7f29\u7b97\u6cd5\u5f53\u524d\u53ea\u5b9a\u4e49\u4e86\u4e00\u79cd\uff0c\u503c\u4e3a0\uff0c\u662f\u4f7f\u7528\u4e00\u4e2a\u6ed1\u52a8\u7a97\u53e3\u7684deflate\/inflate\u538b\u7f29\uff0c\u8fd9\u4e2a\u7b97\u6cd5\u53ef\u4ee5\u8c03\u7528zlib\u5e93\u6765\u5b9e\u73b0<\/p>\n<h2>7.\u5173\u4e8e\u538b\u7f29<\/h2>\n<p>\u5bf9\u4e8e\u4e00\u5f20\u56fe\u7247\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0a\u77e5\u8bc6\u6765\u5b8c\u6210\u4e00\u6b21\u65e0\u635f\u538b\u7f29,\u4ee5\u53ca\u53bb\u9664\u6240\u6709\u7684\u8f85\u52a9\u6570\u636e\u5757\u3002\u4f46\u662f\u5f88\u591a\u573a\u666f\u4e0b\uff0c\u5e38\u89c4\u7684\u65e0\u635f\u538b\u7f29\u5e76\u4e0d\u80fd\u5e26\u6765\u5f88\u9ad8\u7684\u538b\u7f29\u6bd4\uff0c\u8fd9\u4e2a\u65f6\u5019\u53ef\u4ee5\u8003\u8651\u4f7f\u7528\u6709\u635f\u538b\u7f29\uff0c\u5927\u6982\u7684\u601d\u8def\u5c31\u662f\u5c06\u603b\u4f53\u989c\u8272\u6570\u51cf\u5c11\u5230256\u4ee5\u4e0b\uff08\u4f7f\u7528\u76f8\u8fd1\u7684\u989c\u8272\u6765\u4ee3\u66ff\uff09\uff0c\u7136\u540e\u4f7f\u7528\u7d22\u5f15\u8272\u5f69\u6765\u7f16\u7801\u6574\u5f20\u56fe\u7247\uff0c\u5e26\u6765\u5f88\u9ad8\u7684\u538b\u7f29\u6bd4<\/p>\n<h2>\u5b9e\u9645\u64cd\u4f5c\u9a8c\u8bc1<\/h2>\n<p>\u4e00\u7ea7\u538b\u7f29\u56fe\u7247\uff08958.8k\uff09\uff1ahttps:\/\/www.myway5.com\/wp-content\/uploads\/2017\/11\/output_1.png<br \/>\n\u4e5d\u7ea7\u538b\u7f29\u56fe\u7247\uff08857.0k\uff09\uff1ahttps:\/\/www.myway5.com\/wp-content\/uploads\/2017\/11\/output_9.png<br \/>\n\u6709\u635f\u538b\u7f29\u56fe\u7247\uff08273.0k\uff09\uff1ahttps:\/\/www.myway5.com\/wp-content\/uploads\/2017\/11\/test_tiny.png<br \/>\n\u539f\u56fe\uff081.5m\uff09\uff1ahttps:\/\/www.myway5.com\/wp-content\/uploads\/2017\/11\/test.png)<\/p>\n<p>\u4f7f\u7528vim\u6253\u5f00\u539f\u56fe:<br \/>\n<img decoding=\"async\" src=\"https:\/\/www.myway5.com\/wp-content\/uploads\/2017\/11\/2017-11-10-16-41-50\u5c4f\u5e55\u622a\u56fe.png\" alt=\"\" \/><\/p>\n<p><code>8950 4e47 0d0a 1a0a<\/code>\u662fpng\u56fa\u5b9a\u7684\u5934,<\/p>\n<p><code>0000 000d<\/code>\u662fiHDR\u6570\u636e\u5757\u7684\u957f\u5ea6\uff0c\u4e3a13\uff0c<code>4948 4452<\/code>\u662f\u6570\u636e\u5757\u7684type,\u4e3aIHDR\uff0c\u4e4b\u540e\u7d27\u8ddf\u7740\u662fdata\uff0c   <code>0000 02bc<\/code>\u662f\u56fe\u7247\u7684\u5bbd\u5ea6,<code>0000 03a5<\/code>\u662f\u9ad8\u5ea6\uff0c<code>08<\/code>\u662fBit depth\uff0c\u4e5f\u5c31\u662f\u4e00\u4e2a\u901a\u9053\u662f8\u4f4d,<code>06<\/code>\u662fcolor type,\u8fd9\u91cc\u8868\u793a\u56fe\u7247\u662f\u771f\u5f69\u8272\uff0c<code>00<\/code>\u662f\u538b\u7f29\u65b9\u6cd5\uff0cpng\u4e2d\u76ee\u524d\u53ea\u6709\u4e00\u79cd\uff0c\u4e5f\u5c31\u662fLZ77\u6d3e\u751f\u7684\u7b97\u6cd5\uff0c<code>00<\/code>\u662f\u6ee4\u6ce2\u5668\u65b9\u6cd5\uff0c\u8868\u793a\u4e0d\u4f7f\u7528\uff0c<code>00<\/code>\u662f\u9694\u884c\u626b\u63cf\u65b9\u6cd5\uff0c\u4ee3\u8868\u4e0d\u626b\u63cf\u3002<code>8f 1434 a4<\/code>\u662f\u56db\u4e2a\u5b57\u8282\u7684CRC\u6821\u9a8c\u7801\u3002<\/p>\n<p><code>00 0000 01<\/code>\u662fsRGB\u6570\u636e\u5757\u7684\u957f\u5ea6\uff08???)\uff0c\u4e3a1\uff0c<code>73 5247 42<\/code>\u662ftype,\u4e3asRGB\uff0c<code>00<\/code>\u662f\u5b58\u50a8\u7684\u4e00\u4e2a\u5b57\u8282\u6570\u636e\uff0c<code>aece 1ce9<\/code>\u662f\u5faa\u73af\u6821\u9a8c\u7801<\/p>\n<p>\u4e4b\u540e\u8fd8\u6709\u4e00\u4e2aiDoT\u6570\u636e\u5757\uff0c\u518d\u7d27\u63a5\u7740\u624d\u662fIDAT\u6570\u636e\u5757\uff0c\u4e0b\u9762\u5c31\u4e0d\u5206\u6790\u4e86\u3002<\/p>\n<p>\u518d\u6253\u5f009\u7ea7\u538b\u7f29\u7684\u56fe\u7247<br \/>\n<img decoding=\"async\" src=\"https:\/\/www.myway5.com\/wp-content\/uploads\/2017\/11\/2017-11-10-17-00-36\u5c4f\u5e55\u622a\u56fe.png\" alt=\"\" \/><br \/>\n\u7b80\u5355\u770b\u4e00\u4e0b\uff0csRGB\u548ciDOT\u6570\u636e\u5757\u5df2\u7ecf\u4e0d\u5b58\u5728\u4e86,IDAT\u6570\u636e\u5757\u7684\u957f\u5ea6\u53d1\u751f\u4e86\u6539\u53d8\uff0c\u5176\u5b9e\u5c31\u662f\u88ab\u538b\u7f29\u4e86\u3002\u8fd9\u79cd\u538b\u7f29\u662f\u65e0\u635f\u7684\uff0c9\u7ea7\u538b\u7f29\u548c1\u7ea7\u538b\u7f29\u76f8\u5dee\u5341\u51e0k\u7684\u5927\u5c0f\uff0c\u4f46\u662f\u538b\u7f29\u7684\u8d8a\u5c0f\uff0c\u8017\u65f6\u4e5f\u8d8a\u957f\u3002<\/p>\n<p>\u6700\u540e\u53bb\u770b\u5728tinypng\u4e0a\u8fdb\u884c\u6709\u635f\u538b\u7f29\u7684\u56fe\u7247:<br \/>\n<img decoding=\"async\" src=\"https:\/\/www.myway5.com\/wp-content\/uploads\/2017\/11\/2017-11-10-17-04-41\u5c4f\u5e55\u622a\u56fe.png\" alt=\"\" \/><\/p>\n<p>\u5b83\u591a\u4e86\u4e00\u4e2aPLTE\u5b57\u6bb5\uff0c\u610f\u5473\u7740\u8fd9\u5f20\u56fe\u53d8\u6210\u4e86\u7d22\u5f15\u5f69\u8272\u56fe\u7247\uff0c\u7d22\u5f15\u5f69\u8272\u56fe\u7247\u6700\u5173\u952e\u7684\u4e00\u70b9\u5c31\u662f\u603b\u989c\u8272\u6570\u4e0d\u80fd\u8d85\u8fc7256\u3002\u5982\u679c\u8fd9\u5f20\u56fe\u7247\u7684\u603b\u989c\u8272\u6570\u6ca1\u6709256\u4e2a\uff0c\u90a3\u4e48\u751a\u81f3\u53ef\u4ee5\u8bf4\u8fd9\u6b21\u56fe\u7247\u7684\u538b\u7f29\u662f\u65e0\u635f\u7684\u3002\u4f46\u662f\u4e00\u65e6\u989c\u8272\u6570\u8d85\u8fc7256\uff0c\u5c31\u9700\u8981\u5c06\u591a\u4e2a\u76f8\u8fd1\u7684\u989c\u8272\u5904\u7406\u6210\u4e00\u4e2a\u989c\u8272\uff0c\u4e5f\u5c31\u662f\u6709\u635f\u7684\u538b\u7f29<\/p>\n<h2>\u53c2\u8003<\/h2>\n<ul>\n<li>[1] png\u6587\u4ef6\u7ed3\u6784\u5206\u6790:http:\/\/www.360doc.com\/content\/11\/0428\/12\/1016783_112894280.shtml<\/li>\n<li>[2] php imagecreatefrom* \u7cfb\u5217\u51fd\u6570\u4e4b png\uff1ahttp:\/\/drops.xmd5.com\/static\/drops\/tips-16034.html<\/li>\n<li>[3] Portable Network Graphics: https:\/\/en.wikipedia.org\/wiki\/Portable_Network_Graphics<\/li>\n<li>[4] png\u7684\u6545\u4e8b\uff1a\u83b7\u53d6\u56fe\u7247\u4fe1\u606f\u548c\u50cf\u7d20\u5185\u5bb9: https:\/\/www.qcloud.com\/community\/article\/864088<\/li>\n<li>[5] https:\/\/www.w3.org\/TR\/2003\/REC-PNG-20031110\/#figure48<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>1.\u7b80\u4ecb \u3000png\u56fe\u7247\u683c\u5f0f\u91c7\u7528\u4e86\u4e00\u79cd\u5f88\u7075\u6d3b\u7684\u7f16\u7801\u8bbe\u8ba1\uff0c\u652f\u6301\u591a\u79cd\u7f16\u7801\u65b9\u5f0f\u6765\u5c55\u793a\u4e00\u5f20\u56fe\u7247\uff1a\u7070\u5ea6\u56fe\u7247\u3001\u7d22\u5f15\u5f69\u8272\u56fe\u50cf\u3001 &hellip; <a href=\"https:\/\/www.myway5.com\/index.php\/2017\/11\/10\/png\/\" class=\"more-link\">\u7ee7\u7eed\u9605\u8bfb<span 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