< >

Bild-Filter-mit-Canvas.php


Quell Code


<!DOCTYPE html>
<html>
<head>
</head>
<body>

<h2>Bild liegt auf fremd Server</h2>



<img id="scream" src="https://www.w3schools.com/tags/img_the_scream.jpg" alt="The Scream" width="220" height="277">
<canvas id="myCanvas" width="220" height="277" style="border:1px solid #d3d3d3;">
Your browser does not support the HTML5 canvas tag.</canvas>

<script>
document.getElementById("scream").onload = function() {
  var c = document.getElementById("myCanvas");
  var ctx = c.getContext("2d");
  var img = document.getElementById("scream");
  ctx.drawImage(img, 0, 0);
  var imgData = ctx.getImageData(0, 0, c.width, c.height);
  var i;
  for (i = 0; i < imgData.data.length; i += 4) {
    imgData.data[i] = 255 - imgData.data[i];
    imgData.data[i+1] = 255 - imgData.data[i+1];
    imgData.data[i+2] = 255 - imgData.data[i+2];
    imgData.data[i+3] = 255;
  }
  ctx.putImageData(imgData, 0, 0);
};
</script>

<h2> Bild liegt auf mein Server</h2>

<img id="scream1" src="test2.png" alt="The Scream" width="220" height="277">
<canvas id="myCanvas1" width="220" height="277" style="border:1px solid #d3d3d3;">
Your browser does not support the HTML5 canvas tag.</canvas>
<script>
document.getElementById("scream1").onload = function() {
  var c = document.getElementById("myCanvas1");
  var ctx = c.getContext("2d");
  var img = document.getElementById("scream1");
  ctx.drawImage(img, 0, 0);
  var imgData = ctx.getImageData(0, 0, c.width, c.height);
  var i;
  for (i = 0; i < imgData.data.length; i += 4) {
    imgData.data[i] = 255 - imgData.data[i];
    imgData.data[i+1] = 255 - imgData.data[i+1];
    imgData.data[i+2] = 255 - imgData.data[i+2];
    imgData.data[i+3] = 255;
  }
  ctx.putImageData(imgData, 0, 0);
};
</script>

</body>