{"id":207097,"date":"2025-07-08T10:08:48","date_gmt":"2025-07-08T02:08:48","guid":{"rendered":"https:\/\/server.hk\/cnblog\/207097\/"},"modified":"2025-07-08T10:08:48","modified_gmt":"2025-07-08T02:08:48","slug":"%e5%a6%82%e4%bd%95%e7%a1%ae%e5%ae%9a-png%e7%b1%bb%e5%9e%8b%ef%bc%88png8-png24%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/207097\/","title":{"rendered":"\u5982\u4f55\u786e\u5b9a png\u201c\u7c7b\u578b\u201d\uff08png8 \/ png24\uff09"},"content":{"rendered":"

<\/b> <\/p>\n

\u5f53\u524d\u4f4d\u7f6e\uff1a ><\/span> ><\/span> ><\/span> ><\/span> \u5982\u4f55\u786e\u5b9a png\u201c\u7c7b\u578b\u201d\uff08png8 \/ png24\uff09<\/span><\/p>\n

\u6765\u6e90\uff1astackoverflow<\/span>
\n2024-04-19 23:39:37<\/span>
\n<\/i>0\u6d4f\u89c8<\/span>
\n<\/i>\u6536\u85cf<\/span> <\/p>\n

\u600e\u4e48\u5165\u95e8Golang\u7f16\u7a0b\uff1f\u9700\u8981\u5b66\u4e60\u54ea\u4e9b\u77e5\u8bc6\u70b9\uff1f\u8fd9\u662f\u65b0\u624b\u4eec\u521a\u63a5\u89e6\u7f16\u7a0b\u65f6\u5e38\u89c1\u7684\u95ee\u9898\uff1b\u4e0b\u9762\u5c31\u6765\u7ed9\u5927\u5bb6\u6574\u7406\u5206\u4eab\u4e00\u4e9b\u77e5\u8bc6\u70b9\uff0c\u5e0c\u671b\u80fd\u591f\u7ed9\u521d\u5b66\u8005\u4e00\u4e9b\u5e2e\u52a9\u3002\u672c\u7bc7\u6587\u7ae0\u5c31\u6765\u4ecb\u7ecd\u300a\u5982\u4f55\u786e\u5b9a png\u201c\u7c7b\u578b\u201d\uff08png8 \/ png24\uff09\u300b\uff0c\u6d89\u53ca\u5230\uff0c\u6709\u9700\u8981\u7684\u53ef\u4ee5\u6536\u85cf\u4e00\u4e0b<\/p>\n

\u95ee\u9898\u5185\u5bb9
\n <\/p>\n

\u6211\u6b63\u5728\u4f7f\u7528 image<\/code> \u5305\u6765\u89e3\u7801\u56fe\u50cf\u5e76\u786e\u5b9a\u5176\u683c\u5f0f\uff08\u4f8b\u5982 jpg \u6216 png\uff09\uff0c\u4f46\u662f\u6211\u5e0c\u671b\u66f4\u6df1\u5165\uff0c\u6211\u60f3\u77e5\u9053\u8be5 png \u5b9e\u9645\u4e0a\u662f png8<\/code> \u8fd8\u662f png24<\/code>\u3002<\/p>\n

\u4f7f\u7528 go \u6267\u884c\u6b64\u64cd\u4f5c\u7684\u6b63\u786e\u65b9\u6cd5\u662f\u4ec0\u4e48\uff1f<\/p>\n

\uff08\u66f4\u65b01\uff09<\/p>\n

\u76ee\u524d\u6211\u6b63\u5728\u9605\u8bfb\u80fd\u591f\u89e3\u7801\u56fe\u50cf\u7684\u5185\u5bb9\uff0c\u6211\u60f3\u77e5\u9053\u5982\u4f55\u4ece\u8fd9\u91cc\u83b7\u53d6\u989c\u8272\u6a21\u578b\uff1a<\/p>\n

fname := \"img.jpg\"\nf, err := os.Open(fname)\n_, format, err := image.Decode(f)\nif err != nil {\n    log.Fatal(err)\n}\n\nfmt.Println(format, \"format\")<\/pre>\n
 <\/p>\n
\u89e3\u51b3\u65b9\u6848<\/h2>\n
 <\/p>\n
\u8bd5\u8bd5\u8fd9\u4e2a\uff0c\u53ea\u8981\u8bb0\u4f4f\u5b83\u6ca1\u6709\u5065\u5168\u6027\u68c0\u67e5<\/p>\n
package main\n\nimport (\n    \"errors\"\n    \"fmt\"\n    _ \"image\/png\"\n    \"os\"\n)\n\nfunc pngType(f *os.File) (string, error) {\n    f.Seek(24, 0)\n    b := make([]byte, 1)\n    f.Read(b)\n    c := make([]byte, 1)\n    f.Read(c)\n\n    bitDepth := b[0]\n    colorType := c[0]\n\n    if bitDepth == 8 && colorType == 3 {\n        return \"PNG8\", nil\n    }\n\n    if bitDepth == 8 && colorType == 2 {\n        return \"PNG24\", nil\n    }\n\n    if bitDepth == 8 && colorType == 6 {\n        return \"PNG32\", nil\n    }\n\n    return \"\", errors.New(\"unknown_type\")\n}\n\nfunc main() {\n    f, _ := os.Open(\"img.png\")\n    t, _ := pngType(f)\n\n    fmt.Printf(\"The type is `%s`.\\n\", t)\n}<\/pre>\n
\u60a8\u53ef\u4ee5\u67e5\u770b\u53c2\u8003<\/p>\n
\u4eca\u5929\u5e26\u5927\u5bb6\u4e86\u89e3\u4e86\u7684\u76f8\u5173\u77e5\u8bc6\uff0c\u5e0c\u671b\u5bf9\u4f60\u6709\u6240\u5e2e\u52a9\uff1b\u5173\u4e8eGolang\u7684\u6280\u672f\u77e5\u8bc6\u6211\u4eec\u4f1a\u4e00\u70b9\u70b9\u6df1\u5165\u4ecb\u7ecd\uff0c\u6b22\u8fce\u5927\u5bb6\u5173\u6ce8\u516c\u4f17\u53f7\uff0c\u4e00\u8d77\u5b66\u4e60\u7f16\u7a0b~<\/p>\n","protected":false},"excerpt":{"rendered":"
\u5f53\u524d\u4f4d\u7f6e\uff1a > > ...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4925],"tags":[],"class_list":["post-207097","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/207097","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=207097"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/207097\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=207097"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=207097"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=207097"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}