{"id":207571,"date":"2025-07-08T08:19:18","date_gmt":"2025-07-08T00:19:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/207571\/"},"modified":"2025-07-08T08:19:18","modified_gmt":"2025-07-08T00:19:18","slug":"%e6%94%b9%e5%8f%98%e5%83%8f%e7%b4%a0%e5%80%bc%ef%bc%8c%e4%bf%9d%e5%ad%98%e5%b9%b6%e5%86%8d%e6%ac%a1%e8%af%bb%e5%8f%96%e8%bf%94%e5%9b%9e%e5%8e%9f%e5%a7%8b%e9%a2%9c%e8%89%b2","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/207571\/","title":{"rendered":"\u6539\u53d8\u50cf\u7d20\u503c\uff0c\u4fdd\u5b58\u5e76\u518d\u6b21\u8bfb\u53d6\u8fd4\u56de\u539f\u59cb\u989c\u8272"},"content":{"rendered":"

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

\u5f53\u524d\u4f4d\u7f6e\uff1a ><\/span> ><\/span> ><\/span> ><\/span> \u6539\u53d8\u50cf\u7d20\u503c\uff0c\u4fdd\u5b58\u5e76\u518d\u6b21\u8bfb\u53d6\u8fd4\u56de\u539f\u59cb\u989c\u8272<\/span><\/p>\n

\u6765\u6e90\uff1astackoverflow<\/span>
\n2024-04-23 18:03:36<\/span>
\n<\/i>0\u6d4f\u89c8<\/span>
\n<\/i>\u6536\u85cf<\/span> <\/p>\n

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

\u6211\u60f3\u5c06\u50cf\u7d20\u7684\u6240\u6709\u84dd\u8272\u503c\u66f4\u6539\u4e3a 255\uff08\u5982\u679c\u7b49\u4e8e 20\uff09\u3002 \u6211\u8bfb\u53d6\u6e90\u56fe\u50cf\uff0c\u7ed8\u5236\u3002\u5c06\u5176\u7ed8\u5236\u5230\u65b0\u56fe\u50cf.rgba\uff0c\u4ee5\u4fbf\u6211\u53ef\u4ee5\u4fee\u6539\u50cf\u7d20\u3002<\/p>\n

\u4f46\u662f\uff0c\u5f53\u6211\u83b7\u53d6\u8f93\u51fa\u56fe\u50cf\uff08\u6267\u884c\u7a0b\u5e8f\u540e\uff09\u5e76\u5c06\u5176\u4f5c\u4e3a\u8f93\u5165\uff0c\u5e76\u5c06\u8c03\u8bd5\u70b9\u653e\u5165 if \u5757\u5185\uff0c\u5e76\u5728\u8c03\u8bd5\u6a21\u5f0f\u4e0b\u8fd0\u884c\u7a0b\u5e8f\u65f6\uff0c\u6211\u5728\u591a\u4e2a\u70b9\u4e0a\u770b\u5230\u8c03\u8bd5\u5668\u505c\u6b62\u5728\u90a3\u91cc\u3002\u8fd9\u610f\u5473\u7740\uff0c\u6211\u6ca1\u6709\u6b63\u786e\u4fee\u6539\u56fe\u50cf\u3002<\/p>\n

\u8c01\u80fd\u544a\u8bc9\u6211\uff0c\u5982\u4f55\u4fee\u6539\u50cf\u7d20\u5e76\u6b63\u786e\u4fdd\u5b58\uff1f\u975e\u5e38\u611f\u8c22<\/p>\n

func changeOnePixelInImage() {\n    imgPath := \".\/source.png\"\n    f, err := os.Open(imgPath)\n    check(err)\n    defer f.Close()\n    sourceImage, _, err := image.Decode(f)\n\n    size := sourceImage.Bounds().Size()\n    destImage := image.NewRGBA(sourceImage.Bounds())\n    draw.Draw(destImage, sourceImage.Bounds(), sourceImage, image.Point{}, draw.Over)\n\n    for x := 0; x < size.X; x++ {\n        for y := 0; y < size.Y; y++ {\n            pixel := sourceImage.At(x, y)\n            originalColor := color.RGBAModel.Convert(pixel).\n            (color.RGBA)\n\n            b := originalColor.B\n\n            if b == 20 {\n                b = 255 \/\/ <--- then i swap source and destination paths, and debug this line\n            }\n\n            c := color.RGBA{\n                R: originalColor.R,\n                G: originalColor.G,\n                B: b,\n                A: originalColor.A,\n            }\n            destImage.SetRGBA(x, y, c)\n        }\n    }\n    ext := filepath.Ext(imgPath)\n    newImagePath := fmt.Sprintf(\"%s\/dest%s\", filepath.Dir(imgPath), ext)\n    fg, err := os.Create(newImagePath)\n    check(err)\n    defer fg.Close()\n    err = jpeg.Encode(fg, destImage, &jpeg.Options{100})\n    check(err)\n}\n<\/pre>\n
 <\/p>\n
\u89e3\u51b3\u65b9\u6848<\/h2>\n
 <\/p>\n
\u6211\u627e\u5230\u4e86\u95ee\u9898\u7684\u7b54\u6848\u3002 \u95ee\u9898\u662f\uff0c\u6211\u5728\u89e3\u7801 jpeg \u56fe\u50cf\u65f6\uff0c\u4ece\u8fd9\u4e2a stackoverflow \u95ee\u9898\u4e2d\u53d1\u73b0 jpeg \u56fe\u50cf\u8d28\u91cf\u4e0b\u964d\uff08\u56e0\u6b64\uff0c\u50cf\u7d20\u503c\u5728\u6b64\u8fc7\u7a0b\u4e2d\u88ab\u4fee\u6539\uff09\uff1a<\/p>\n
\u6240\u4ee5\uff0c\u6211\u5e94\u8be5\u4f7f\u7528png\u56fe\u50cf\u3002\uff08\u5373\u4f7f\u6211\u4f7f\u7528source.png<\/code>\u4f5c\u4e3a\u6e90\u56fe\u50cf\uff0c\u5b83\u5b9e\u9645\u4e0a\u662fjpg\u56fe\u50cf:\/\uff09<\/p>\n
\u6240\u4ee5\u6211\u5c06\u6700\u540e\u51e0\u884c\u66f4\u6539\u4e3a\uff1a<\/p>\n
if ext != \".png\" {\n    panic(\"cannot do my thing with jpg images, since they get compressed\")\n}\nerr = png.Encode(fg, destImage)\n<\/pre>\n
\u5230\u8fd9\u91cc\uff0c\u6211\u4eec\u4e5f\u5c31\u8bb2\u5b8c\u4e86\u300a\u6539\u53d8\u50cf\u7d20\u503c\uff0c\u4fdd\u5b58\u5e76\u518d\u6b21\u8bfb\u53d6\u8fd4\u56de\u539f\u59cb\u989c\u8272\u300b\u7684\u5185\u5bb9\u4e86\u3002\u4e2a\u4eba\u8ba4\u4e3a\uff0c\u57fa\u7840\u77e5\u8bc6\u7684\u5b66\u4e60\u548c\u5de9\u56fa\uff0c\u662f\u4e3a\u4e86\u66f4\u597d\u7684\u5c06\u5176\u8fd0\u7528\u5230\u9879\u76ee\u4e2d\uff0c\u6b22\u8fce\u5173\u6ce8\u516c\u4f17\u53f7\uff0c\u5e26\u4f60\u4e86\u89e3\u66f4\u591a\u5173\u4e8e\u7684\u77e5\u8bc6\u70b9\uff01<\/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-207571","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/207571","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=207571"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/207571\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=207571"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=207571"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=207571"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}