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Showing content from https://webplatform.github.io/docs/apis/canvas/ImageData/height below:

height · WebPlatform Docs

The number of rows in the image data.

Property of apis/canvas/ImageDataapis/canvas/ImageData

Note: This property is read-only.

var result = ImageData.height;

Returns an object of type unsigned longunsigned long

This example creates an ImageData object and reports its height, then draws the ImageData onto the canvas.

<canvas id="myCanvas" width="300" height="150" style="border:1px solid blue;"></canvas>
<p>. . .</p>
<script>
var can = document.getElementById("myCanvas");
var ctxt = can.getContext("2d");
var imgdata = ctxt.createImageData(150, 100);
alert(imgdata.height); 
for (var i = 0; i < imgdata.data.length; i += 4) {
  imgdata.data[i+0] = 255;
  imgdata.data[i+1] = 255;
  imgdata.data[i+2] = 0;
  imgdata.data[i+3] = 128;
}
ctxt.putImageData(imgdata, 10, 10);
</script>

W3C HTML Canvas 2D Specification

W3C Candidate Recommendation

• Microsoft Developer Network: Windows Internet Explorer API reference Article

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