{"id":1427,"date":"2021-08-14T10:55:03","date_gmt":"2021-08-14T01:55:03","guid":{"rendered":"https:\/\/dalomo.net\/blog\/?p=1427"},"modified":"2021-08-14T12:09:22","modified_gmt":"2021-08-14T03:09:22","slug":"%e3%83%91%e3%82%a4%e3%81%93%e3%81%ad%e5%a4%89%e6%8f%9b%e5%99%a8%e3%82%92%e4%bd%9c%e3%82%8a%e3%81%9f%e3%81%84","status":"publish","type":"post","link":"https:\/\/dalomo.net\/blog\/2021\/08\/14\/1427\/","title":{"rendered":"\u30d1\u30a4\u3053\u306d\u5909\u63db\u5668\u3092\u4f5c\u308a\u305f\u3044"},"content":{"rendered":"

\u30d1\u30a4\u3053\u306d\u5909\u63db\u5668<\/h1>\n

\u30b7\u30ea\u30b3\u30f3\u306b\u8272\u3092\u4ed8\u3051\u308b\u52d5\u753b<\/p>\n

https:\/\/twitter.com\/nerimarina\/status\/1422921489230090249<\/p>\n

\u3092\u898b\u3066\u3044\u305f\u3089\u3001\u30d1\u30a4\u3053\u306d\u5909\u63db<\/p>\n

https:\/\/ja.wikipedia.org\/wiki\/%E3%83%91%E3%82%A4%E3%81%93%E3%81%AD%E5%A4%89%E6%8F%9B<\/a><\/p>\n

\u3068\u3044\u3046\u7528\u8a9e\u3092\u77e5\u3063\u305f\u3002\u306a\u3093\u304b\u3084\u3063\u3066\u307f\u305f\u3044\u306a\u30fc\u3068\u601d\u3063\u305f\u306e\u3067\u3001\u3084\u3063\u3066\u307f\u308b\u3053\u3068\u306b\u3057\u305f\u3002<\/p>\n

\u3069\u3046\u3084\u308d\u3046<\/h2>\n

\u30ed\u30fc\u30ab\u30eb\u3060\u3051\u3067\u3084\u3063\u3066\u3082\u3044\u3044\u3093\u3060\u3051\u3069\u3001\u3069\u3046\u305b\u306a\u3089\u516c\u958b\u3057\u3066\u307f\u305f\u3044\u306a\u30fc\u3068\u601d\u3063\u305f\u3002\u3067\u3082\u30b5\u30fc\u30d0\u30fc\u306e\u30ea\u30bd\u30fc\u30b9\u4f7f\u3046\u3088\u3046\u306a\u3084\u308a\u65b9\u3060\u3068\u3001\u51e6\u7406\u3057\u304d\u308c\u308b\u306e\u304b\u306a\u30fc\uff1f\u3068\u306a\u3063\u305f\u306e\u3067\u30d6\u30e9\u30a6\u30b6\u4e0a\u3060\u3051\u3067\u3084\u308c\u308b\u3088\u3046\u306a\u65b9\u6cd5\u3092\u63a2\u3057\u305f\u3044\u3002\u307e\u3041\u306a\u3093\u304b\u3042\u308b\u3060\u308d\u3002<\/p>\n

\u30d5\u30a1\u30a4\u30eb\u3092\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u3057\u3066\u8868\u793a\u3059\u308b<\/h2>\n

\u307e\u305a\u306f\u3053\u306e\u90e8\u5206\u3092\u4f5c\u3063\u3066\u3001\u30d1\u30a4\u63c9\u307f\u51e6\u7406\u306f\u5f8c\u3067\u4f5c\u308d\u3046\u3002<\/p>\n

\u00a0HTML<\/h3>\n
\n
\u00a0<input\u00a0type=\"file\"\u00a0id=\"selectfile\"\u00a0name=\"selectfile\"\u00a0accept='image\/*'\u00a0required><\/pre>\n<\/div>\n
input\u30bf\u30b0\u306etype\u3092\u30d5\u30a1\u30a4\u30eb\u306b\u3059\u308b\u3068\u30d5\u30a1\u30a4\u30eb\u9078\u629e\u30dc\u30bf\u30f3\u304c\u3067\u304d\u308b\u3002accept=’image\/*’\u3067Minetype\u753b\u50cf\u30d5\u30a1\u30a4\u30eb\u3092\u9650\u5b9a\u3067\u304d\u308b\u3002required\u3067\u5165\u529b\u5fc5\u9808\u3002<\/p>\n
Javascript<\/h3>\n
const fileInput = document.getElementById('selectfile');\r\n\r\nfileInput.addEventListener('change', func);<\/pre>\n
\u8981\u7d20\u3092\u53d6\u5f97\u3057\u3066\u3001\u30ea\u30b9\u30ca\u3092\u8a2d\u5b9a\u3059\u308b\u3002change\u3063\u3066\u3044\u3046\u306e\u304c\u5909\u66f4\u304c\u78ba\u5b9a\u3057\u305f\u3068\u304d\u306b\u5b9f\u884c\u3055\u308c\u308b\u3088\u3046\u306b\u8a2d\u5b9a\u3059\u308b\u3084\u3064\u3002\u5909\u66f4\u304c\u767a\u751f\u3059\u308b\u3068func\u304c\u5b9f\u884c\u3055\u308c\u308b\u3068\u3002\u305d\u3093\u3067func\u306e\u4e2d\u8eab\u3092\u4f5c\u3063\u3066\u304f\u3002\u3053\u306e\u95a2\u6570\u306e\u66f8\u304d\u65b9\u304c\u8272\u3005\u3042\u308b\u304b\u3089\u8ff7\u3046\u3093\u3060\u3088\u306a\u30fc\u3002<\/p>\n
File<\/h4>\n
\u3068\u308a\u307e<\/p>\n
const loadImage = () => {\r\n      const file = fileInput.files[0];\r\n      console.log(file);\r\n    }<\/code><\/pre>\n
\u3066\u3057\u3066<\/p>\n
\"\"<\/a><\/p>\n
\u7d20\u6750\u3092\u7528\u610f\u3057\u307e\u3057\u3066\u3001\u30d5\u30a1\u30a4\u30eb\u3092\u9078\u629e\u3057\u3066\u307f\u308b\u3068<\/p>\n
\"\"<\/a><\/p>\n
\u8aad\u3081\u305f\u3063\u307d\u3044\u3002\u3058\u3083\u3042\u4eca\u5ea6\u306f\u3053\u308c\u3092\u8868\u793a\u3059\u308b\u3002<\/p>\n
FileReader<\/h4>\n
<div id=\"preview\"><\/div><\/pre>\n
input\u30bf\u30b0\u306e\u4e0b\u306b\u8ffd\u52a0\u3057\u3068\u304f\u3002<\/p>\n
\u4e0a\u306econsole.log\u306e\u884c\u306e\u4ee3\u308f\u308a\u306b<\/p>\n
const reader = new FileReader();\r\n      reader.onload = function (e) {\r\n        const imageUrl = e.target.result;\r\n        const img = document.createElement(\"img\");\r\n        img.src = imageUrl;\r\n        preview.appendChild(img);\r\n      }\r\n\r\n      reader.readAsDataURL(file);<\/code><\/pre>\n
\u3053\u308c\u306f\u307e\u3041\u30b3\u30d4\u30da\u3067\u3059\u3002file\u3092DataURL\u3068\u3057\u3066\u8aad\u307f\u8fbc\u3093\u3060\u5f8c\u306b\u3001img\u30bf\u30b0\u3092\u4f5c\u6210\u3057\u3066\u3001src\u306bDataURL\u3092\u8a2d\u5b9a\u3059\u308b\u3002\u3082\u3063\u304b\u3044\u8aad\u307f\u8fbc\u3093\u3067\u307f\u308b\u3068<\/p>\n
\"\"<\/a><\/p>\n
\u8868\u793a\u3055\u308c\u305f\uff01<\/p>\n
\u753b\u50cf\u3092\u52a0\u5de5\u3067\u304d\u308b\u3088\u3046\u306b\u3059\u308b<\/h2>\n
\u753b\u50cf\u3092\u8aad\u307f\u8fbc\u3081\u305f\u306e\u3067\u4eca\u5ea6\u306f\u753b\u50cf\u3092\u52a0\u5de5\u3067\u304d\u308b\u3088\u3046\u306b\u3057\u3066\u304f\u3002\u8aad\u307f\u8fbc\u3093\u3060\u6642\u70b9\u3067\u52a0\u5de5\u306e\u51e6\u7406\u3092\u8d70\u3089\u3059\u3053\u3068\u3082\u3067\u304d\u308b\u3093\u3060\u308d\u3046\u3051\u3069\u3001\u8aad\u307f\u8fbc\u3093\u3067\u304b\u3089\u30dc\u30bf\u30f3\u3092\u62bc\u3057\u3066\u51e6\u7406\u3092\u5b9f\u884c\u3059\u308b\u611f\u3058\u306b\u3057\u305f\u3044\u3002<\/p>\n
\u30dc\u30bf\u30f3\u3092\u8a2d\u7f6e\u3057\u305f\u308a<\/h3>\n
\n
 \u00a0<h1>\u30d1\u30a4\u3053\u306d\u5909\u63db\u5668<\/h1>\r\n \u00a0<input\u00a0type=\"file\"\u00a0id=\"selectfile\"\u00a0name=\"selectfile\"\u00a0accept='image\/*'\u00a0required><br>\r\n \u00a0<button\u00a0onclick=\"\">\u5b9f\u884c<\/button>\r\n \u00a0<h2>\u51e6\u7406\u524d<\/h2>\r\n\u00a0\u00a0<div\u00a0id=\"preview\"><\/div>\r\n\r\n \u00a0<h2>\u51e6\u7406\u5f8c<\/h2>\r\n\u00a0\u00a0<div\u00a0id=\"result\"><\/div><\/pre>\n<\/div>\n
HTML\u3092\u3053\u3093\u306a\u611f\u3058\u306b\u3057\u305f\u3002<\/p>\n
\u30dc\u30bf\u30f3\u3092\u62bc\u3059\u3068\u753b\u50cf\u3092\u8868\u793a\u3059\u308b<\/h3>\n
\u8981\u7d20\u3092\u53d6\u5f97\u3057\u3066\u3001canvas\u306b\u5909\u63db\u3057\u3066\u3001\u8868\u793a\u3059\u308b\u3002<\/p>\n
function knead() {\r\n        const preimg = document.getElementById(\"preimg\");\r\n\r\n        image = new Image();\r\n        image.onload = () => {\r\n          var canvas = document.getElementById(\"result\");\r\n          var ctx = canvas.getContext(\"2d\");\r\n          canvas.width = image.width;\r\n          canvas.height = image.height;\r\n          ctx.drawImage(image, 0, 0)\r\n\r\n        }\r\n\r\n        image.src = preimg.src;\r\n        console.log(preimg);\r\n      }<\/code><\/pre>\n
\u3053\u308c\u306a\u3093\u304b\u62e1\u5f35\u6a5f\u80fd\u4f5c\u3063\u305f\u3068\u304d\u3084\u3063\u305f\u306a\u3002<\/p>\n
\u52a0\u5de5\u3067\u304d\u308b\u3088\u3046\u306b\u3059\u308b<\/h3>\n
ImageData\u5f62\u5f0f\u3068\u3044\u3046\u3082\u306e\u306b\u5909\u63db\u3059\u308c\u3070\u3044\u3044\u307f\u305f\u3044\u3002context.getImageData\u3067\u53d6\u5f97\u3002<\/p>\n
var imagedata = ctx.getImageData(0,0,image.width,image.height);<\/code><\/pre>\n
ImageData\u306f\u753b\u50cf\u3092\u4e00\u6b21\u5143\u306e\u914d\u5217\u306b\u3057\u305f\u3082\u306e\u307f\u305f\u3044\u3002\u4f8b\u3048\u30704\u00d74\u306e\u753b\u50cf\u306e\u5834\u5408<\/p>\n\n\n\n\n\n\n\n\n\n\n
0,0<\/td>\n0,1<\/td>\n0,2<\/td>\n0,3<\/td>\n<\/tr>\n
0<\/td>\n1<\/td>\n2<\/td>\n3<\/td>\n4<\/td>\n5<\/td>\n6<\/td>\n7<\/td>\n8<\/td>\n9<\/td>\n10<\/td>\n11<\/td>\n12<\/td>\n13<\/td>\n14<\/td>\n15<\/td>\n<\/tr>\n
1,0<\/td>\n1,1<\/td>\n1,2<\/td>\n1,3<\/td>\n<\/tr>\n
16<\/td>\n17<\/td>\n18<\/td>\n19<\/td>\n20<\/td>\n21<\/td>\n22<\/td>\n23<\/td>\n24<\/td>\n25<\/td>\n26<\/td>\n27<\/td>\n28<\/td>\n29<\/td>\n30<\/td>\n31<\/td>\n<\/tr>\n
2,0<\/td>\n2,1<\/td>\n2,2<\/td>\n2,3<\/td>\n<\/tr>\n
32<\/td>\n33<\/td>\n34<\/td>\n35<\/td>\n36<\/td>\n37<\/td>\n38<\/td>\n39<\/td>\n40<\/td>\n41<\/td>\n42<\/td>\n43<\/td>\n44<\/td>\n45<\/td>\n46<\/td>\n47<\/td>\n<\/tr>\n
3,0<\/td>\n3,1<\/td>\n3,2<\/td>\n3,3<\/td>\n<\/tr>\n
48<\/td>\n49<\/td>\n50<\/td>\n51<\/td>\n52<\/td>\n53<\/td>\n54<\/td>\n55<\/td>\n56<\/td>\n57<\/td>\n58<\/td>\n59<\/td>\n60<\/td>\n61<\/td>\n62<\/td>\n63<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306f\u3053\u3046\u632f\u3089\u308c\u3066\u308b\u611f\u3058\u304b\u3002\u30b0\u30ec\u30b9\u30b1\u5316\u3092\u8abf\u3079\u3066\u307f\u3066<\/p>\n
image.onload = () => {\r\n          var canvas = document.getElementById(\"result\");\r\n          var ctx = canvas.getContext(\"2d\");\r\n\r\n          canvas.width = image.width;\r\n          canvas.height = image.height;\r\n          ctx.drawImage(image, 0, 0);\r\n\r\n          var imagedata = ctx.getImageData(0, 0, image.width, image.height);\r\n\r\n          for (let index = 0; index < imagedata.data.length; index += 4) {\r\n            var r = imagedata.data[index];\r\n            var g = imagedata.data[index + 1];\r\n            var b = imagedata.data[index + 2];\r\n\r\n            var gray = (r + g + b) \/ 3;\r\n\r\n            imagedata.data[index] = gray;\r\n            imagedata.data[index + 1] = gray;\r\n            imagedata.data[index + 2] = gray;\r\n\r\n          }\r\n\r\n          ctx.putImageData(imagedata,0,0)\r\n\r\n        }<\/code><\/pre>\n
\u3053\u3093\u306a\u611f\u3058\u306b\u3057\u305f\u3089<\/p>\n
\"\"<\/a><\/p>\n
\u3067\u304d\u305f\uff01\u3042\u3068\u306f\u3044\u3088\u3044\u3088\u30d1\u30a4\u63c9\u307f\u3059\u308c\u3070\u3044\u3044\u3093\u3060\u306a\u3002<\/p>\n
\u30d1\u30a4\u3053\u306d\u3092\u30b3\u30fc\u30c9\u3067\u8868\u73fe\u3057\u305f\u3044<\/h2>\n
\u6d41\u308c\u306f\u3001\u62e1\u5927\u7e2e\u5c0f\u3057\u3066\u3001\u534a\u5206\u306b\u5206\u5272\u3057\u3066\u3001\u4e0a\u4e0b\u306b\u4e26\u3073\u66ff\u3048\u308b\u3063\u3066\u611f\u3058\u3002\u8a00\u3046\u306e\u306f\u7c21\u5358\u3060\u3088\u306d\u2026\u3002<\/p>\n
\u62e1\u5927\u7e2e\u5c0f<\/h3>\n
\u3046\u3093\u3046\u3093\u5538\u308a\u306a\u304c\u3089<\/p>\n
image.onload = () => {\r\n          var canvas = document.getElementById(\"result\");\r\n          var ctx = canvas.getContext(\"2d\");\r\n\r\n          canvas.width = image.width;\r\n          canvas.height = image.height;\r\n          ctx.drawImage(image, 0, 0);\r\n\r\n          var imagedata = ctx.getImageData(0, 0, image.width, image.height);\r\n          var trnsdata = ctx.createImageData(image.width * 2, image.height \/ 2);\r\n\r\n          for (let idxw = 0; idxw < trnsdata.width - 1; idxw += 2) {\r\n            for (let idxh = 0; idxh < trnsdata.height - 1; idxh++) {\r\n              var idxt = trnsdata.width * 4 * idxh + idxw * 4;\r\n              var idxi = imagedata.width * 4 * (idxh * 2) + (idxw \/ 2) * 4;\r\n              trnsdata.data[idxt] = imagedata.data[idxi];\r\n              trnsdata.data[idxt + 1] = imagedata.data[idxi + 1];\r\n              trnsdata.data[idxt + 2] = imagedata.data[idxi + 2];\r\n              trnsdata.data[idxt + 3] = imagedata.data[idxi + 3];\r\n              \r\n            }\r\n          }\r\n\r\n          canvas.width = canvas.width * 2;\r\n          canvas.height = canvas.height \/ 2;\r\n          ctx.putImageData(trnsdata, 0, 0)\r\n\r\n        }<\/code><\/pre>\n
\u7e26\u65b9\u5411\u306f\u9593\u5f15\u3044\u3066\u3001\u6a2a\u65b9\u5411\u306f\u4f38\u9577\u3055\u305b\u305f\u3002\u534a\u5206\u30672\u500d\u306a\u306e\u3067\u8003\u3048\u308b\u3053\u3068\u304c\u5c11\u306a\u304f\u3066\u6e08\u3093\u3060\u3002\u305f\u3060\u6a2a\u65b9\u5411\u306e\u88dc\u9593\u3092\u3057\u3066\u306a\u3044\u3002\u3068\u308a\u307e\u3053\u3053\u307e\u3067\u306e\u7d50\u679c<\/p>\n
\"\"<\/a><\/p>\n
\"\"<\/a><\/p>\n
\u3053\u3046\u306a\u3063\u305f\u3002\u305d\u3093\u3067\u88dc\u9593\u3092\u52b9\u304b\u3059\u3068<\/p>\n
for (let index = 4; index < trnsdata.data.length; index += 8) {\r\n            var r = (trnsdata.data[index - 4] + trnsdata.data[index + 4]) \/ 2;\r\n            var g = (trnsdata.data[index - 4 + 1] + trnsdata.data[index + 4 + 1]) \/ 2;\r\n            var b = (trnsdata.data[index - 4 + 2] + trnsdata.data[index + 4 + 2]) \/ 2;\r\n            var a = (trnsdata.data[index - 4 + 3] + trnsdata.data[index + 4 + 3]) \/ 2;\r\n\r\n            trnsdata.data[index] = r;\r\n            trnsdata.data[index + 1] = g;\r\n            trnsdata.data[index + 2] = b;\r\n            trnsdata.data[index + 3] = a;\r\n\r\n          }<\/code><\/pre>\n
\u3053\u3093\u306a\u30fc<\/p>\n
\"\"<\/a><\/p>\n
\u304a\u30fc\u3001\u3044\u30fc\u3093\u3058\u3083\u306a\u3044\uff1f<\/p>\n
\u5206\u5272\u3057\u3066\u4e0a\u4e0b\u306b\u7d50\u5408<\/h3>\n
\u8a08\u7b97\u304c\u5927\u5909\u3002\u306a\u3093\u3068\u304b<\/p>\n
var halfwidth = trnsdata.width \/ 2;\r\n          var rowsize = trnsdata.width * 4;\r\n          var ti = 0;\r\n\r\n          for (let ih = 1; ih <= trnsdata.height; ih++) {\r\n            for (let i = 0; i < halfwidth * 4; i++) {\r\n              var idxt = rowsize * ih - halfwidth * 4;\r\n              tempdata.data[ti] = trnsdata.data[idxt + i];\r\n\r\n              ti++;\r\n            }\r\n          }\r\n\r\n          for (let ih = 1; ih <= trnsdata.height; ih++) {\r\n            for (let i = 0; i < halfwidth * 4; i++) {\r\n              var idxt = i + trnsdata.width * 4 * (ih - 1);\r\n              tempdata.data[ti] = trnsdata.data[idxt];\r\n\r\n              ti++;\r\n            }\r\n          }<\/code><\/pre>\n
\u3053\u3093\u306a\u611f\u3058\u306b\u3002\u5b9f\u884c\u3059\u308b\u3068<\/p>\n
\"\"<\/a><\/p>\n
\u3084\u3063\u305f\u30fc\uff01\u3068\u308a\u3042\u3048\u305a1\u56de\u3053\u306d\u308c\u305f\uff5e<\/p>\n
\u8907\u6570\u56de\u3053\u306d\u3089\u308c\u308b\u3088\u3046\u306b\u3059\u308b<\/h2>\n
\u3044\u3063\u3071\u3044\u3053\u306d\u305f\u3044\u3002<\/p>\n
\u56de\u6570\u3092\u8a2d\u5b9a\u3067\u304d\u308b\u3088\u3046\u306b\u3059\u308b<\/h3>\n
\n
<input\u00a0type=\"range\"\u00a0id=\"slider\"\u00a0min=\"1\"\u00a0max=\"10\"\u00a0value=\"5\"><label>\u00a05\u56de\u3053\u306d\u308b<\/label><br><br><\/pre>\n<\/div>\n
\u3053\u308c\u306a\u30fc\u3002<\/p>\n
var range = document.getElementById(\"slider\");\r\n\r\n    function changeLabel() {\r\n      var label = document.getElementsByTagName(\"label\");\r\n      label[0].innerText = \" \" + range.value + \"\u56de\u3053\u306d\u308b\";\r\n    }\r\n\r\n    range.addEventListener(\"input\", changeLabel);<\/code><\/pre>\n
\u3053\u308c\u3082\u30fc\u3002\u3042\u3068\u306ffor\uff1f\u5168\u90e8\u62ec\u3063\u3066<\/p>\n
for (let idxc = 0; idxc < tempdata.data.length; idxc++) {\r\n            imagedata.data[idxc] = tempdata.data[idxc];\r\n          }<\/code><\/pre>\n
\u3053\u308c\u3082\u8ffd\u52a0\u3002\u7d50\u679c<\/p>\n