How to Get Image from Canvas Element and Use It in Img Src Tag

Assign a canvas element to the img.src

You need to use the method Canvas#toDataURL method

The HTMLCanvasElement.toDataURL() method returns a data URI containing a representation of the image in the format specified by the type parameter (defaults to PNG). The returned image is in a resolution of 96 dpi.

img.src = document.getElementById("canvas1").toDataURL();

Working Example:

const canvas = document.getElementById("canvas");const img_from_canvas = document.getElementById("img_from_canvas");
const context = canvas.getContext("2d");context.rect(10, 10, 150, 100);context.fill();img_from_canvas.src = canvas.toDataURL();

<p>canvas</p><canvas id="canvas"></canvas><p>image from canvas</p><img id="img_from_canvas"/>

Show a part of canvas image in an img tag

I have solved my problem with the suggestions of everyone. I've used a temporary canvas to hold the part of main canvas and then get the partial image from it.

And my solution is:

var canvas = $('canvas')[0];var ctx = canvas.getContext("2d");
$('#baseImg').load(function() {    ctx.drawImage(this, 0, 0);});
$('#full').click(function() {    $('div').html('');    var image = new Image();    image.onload = function() {        $('div').html(this);    };    image.src = canvas.toDataURL();});
$('#partail').click(function() {    $('div').html('');
    var height = 50, width = 50;    var copyCanvas = $('<canvas id="canvas" width="' + width + '" height="' + height + '"></canvas>')[0];    var copyCtx = copyCanvas.getContext("2d");    copyCtx.putImageData(ctx.getImageData(10, 10, width, height), 0, 0);
    var image = new Image();    image.onload = function() {        $('div').html(this);    };    image.src = copyCanvas.toDataURL();});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<h3>Canvas</h3><canvas id="canvas" width="100" height="100" style="border: 1px solid #000000;"></canvas>
<br /><br /><img id="baseImg" style="display: none;" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAGQAAABkCAYAAABw4pVUAAAQzUlEQVR4nO2dT2gaWRzH5yZKTpEcEjyEXBQ8aZDs2Ys0NFR6yCUHwYO5FMJaehMKCYQcjQcPKSspFHvIH3owBakJrGEDKVQIdQ2mkEr+tErDJtDQlbLJdw/O7zkzzowzOhNtdw8/YtM4zrzP+/19v/fkOI7D/9JX0vMb+F/+60B8Xidmpsfhdjl6fi//aSA2qwVL8xP4Wn2Er9VHuDiZxYtn9zAybO/5vf3ngNgHB5DZmATqT4D6E/xz+St7XXwbgs/r7Pk9/meACGH8c/lri6D+BKfl2X6B0vMbMB3Gbm5KEYYQSvFtCGOjQ72+594Pmp7BDfg9WJqfwNL8BAJ+D+yDA6p/r6YZclB2c1Oq1/wpgPi8zq7MgX1wADPT4zgtz4oGl2b10vxEyyCODNt1wZBeM+D3wGa1/HxAAn4PqicPMTM93vH7yeSo+YDd3BQioSALaYtvQ7phCK/3z+WvePHsHgJ+z88DxO1y4OKkMav1AqEQld6vZRBRf4LqyUPRoHYjqD/B1+ojZDYmMTM9flcaY86FbVaLaGa/eHZP83vHRodaQlS9s9soEd4DmUeTwZhz4Znp8ZaHi4SCmt4n9RX9JGQeTYzGzAEidaj0eml+QtbBu10OLM1PmDLLzYBSfBsyK8M3HoZ9cACn5VlF9T8tzyKzMYml+Qm8eHYPmY1J5iv6HYbwWfSY4Z4C8XmduDhpBSIFIy1h9HqQ9cjX6iNUPjzoOHq8UyABvwdfq48MG2QpwH6QyocHqHx4gMzGpNFOvn+B0Pt3c1PIbEwiszEp+r0emFTdNQLqxcksysX7TAzWEvOAdAsiszEJt8uBkWE77IMDsFktcLscbWtTQm3azU2xtY+x0SFduY0WGNWTh1j97RcjtcR4IGOjQx2Hrqg/wcXJLJt1bpcDsWgYyfgiIqEgK5EszU8o+qHi2xBePLsHt8shO1ABv6cjKFIY5eJ9VD48QLl438iM3nggNqulo9KFdG0iFg3j+lMBuDkDro+A+jEK+U328JSzfK0+YhC0ZtRyeZJeGFIt6VsgHMfhxbN7umHQ6p3NakE6lQDqxw0Qf/0JXJYacnOG7xfvEYuGmTYG/J6WRI0qwyRK99hu0lA0pQTDBF9iDhC3y6HLX1BM73Y5UMhvNrVCCINEoC2RUBBulwM+rxMBvwexaBi5tTg+l/O4rOzj+lMBl5V9HB+8wfLCnCiZsw8OqGpy9eShZhgGQjEextjoEGxWS9sZSP9HDxHwe3B88KYBQwpBTpSAkWYJhf/d53JeNGgz0+Oie6RoTA8EqT/pEoqxMCKhIC5OZrE0P4Gx0SE2A+Wk+DbEbj4SCuJzOd8YOC0wOhUeEJk8jmuUefSYpnZQdnNT3XS0GKsZlH+g/gSRUJCFmru5KZyWZ0XOlyKmWDTcnMVyM94EKN8v3osiuW5BGOjkjQMiVH/6STE65RH0k0xUIb/ZNDFmg5CYtcvKPpvJS/MTLPummS4UGuzd3JRIG5S0qvLhQaerpMYBWf3tl5YK72l5lj30zPQ4YtEw0qkELiv7DRA3Z70BwkNJpxLguEaovvrbL2yAqTqw+tsvmJkeh8/rxNjoEMZGh+B2OTAzPY6l+QmR75AC6VBLjAMidOKU4NEsiYSCjcEXyOdyHulUApFQEMsLc8pO2mTzFYuGmeYG/B42+GRSbVYLE+kz+7xOZDYmFTWlg3UTc4BIoyf89Scb8L2tFRau0ntHhu3mO3QFILg+QiG/ieWFOURCQSzNT+D16lPk1uLY21oRSW4tzgDSvVN3ixRK5cMDLM1P9A6IsJxBN+LzOhvR080Z9rZWFO3q2OiQuUDkkkyhXG0D5xletoEv2YacZ8Q/ecmtxUWzP+D3yJqtDqrBxgHxeZ1A/QkyG5NM1bPZLEvyCvlNxKJh1h3i8zpZ4TASCppjsvjo7fjgTfPfcn93vg1UXsnLx81W+ZLFy8Rj0fNLtYRe63TuxgGhSiyZomR8UTzrr4+aPqR+jM/lPAr5TeTW4g0nb4JmUJnF7XI0/ZQSEOGAqwGh359nRGUZcvLSEFin2TIOCIW1HMeHwO1mPOUeamWSLqReOxA1VohqZFo0RA0OD0SYYM5MjxsRbRkHhGRk2N7Muu86aiK5OcPywlzLvY2NDjXuTToBlEyWHBT6/XlGZLaUgGQ2JvVEW8bCsFktDVOltR5lltSPFYMIVhnQ60Okv9eoIeXifT2lFGOBBPwefL94r16pvat8g8/GpWGqzWppVgi0AFGAUj9aZwMtTSylUHQsYBkHwz44gL2tFXnt4OtHhfymvMkwEQqF3MJZyhJVIRAlpy6FwofHQu2g0otSbasnQFoeUiKRUJA5/kJ+825N2M0ZCvlNBoXlR6Ql7TSk8orlIFfFNAsWbFYLZqbHVSvFPQFiHxxoxPpyM//6CMn4Yis8rfUroyrBfD7i8zqb9ysE0kZDDneSWF6YY1DHRocUzVTPgagN8PeL9y1OLeD3aMvM+UWl3FrcMBP2uZxHMr4oNp3nGWUgksyctGI3N6V5DeVOnbqskxQM6N7WSkv5gOUpbWBcVvbh8zrhdjkaDQ9aB14teJBq3F9/qpus8wyq756LmiuqJw9RPXmoecHqTsPemenxZmQlMyPTqUQLkLYmix9QstWRUFB7rYvXKl3BA2mIUmR11TBp1FChVuGVSwx1bJPrHkg6lVB25gpAFDNmmffZBwe0Dy7/PtIqRc2Viko2flVM4/XqU1TfPcffH1+xvY1aTNadl07cLof6YNWPkVuLi4D4vE5188N3lFCHCKuJtYPBFzCFn8W0V6uGyNSr6kfrCPg9cLscIihaln47aMjuDki7UBeXJVx/KjCnxnIVpVnLO136+7aJplBuzloevi38yxJwUVBPAs8zzA/6vE7mU8ZGh2Szc6n/0Nnw0B0QTWWS6yPWF8V6rhRgXFb2mfNk+YqWMgzvN6QP73Y5UK8ddAeEj7SobhWLhoGrbextrcA+OICl+QlZB3/n6yEjw/Zm7qHF2aqtnQtyhBbfpMUp87Ur6a6mgN+jX0Nk/AgtUMWiYdislkYYfrWNWDSMsdEhRX9ypyuGjQUpA1b5eJ8hnN2xaFj3NbLZbAsQ2UKiFiCCiu7hTrJhZr9kgY+brEuyfrSO+tE624otpyUdbHsz13+0MzPk9IVhoS6/IYEqDS81RVnVP5STwvMMlhfmYLNa8DLxGLjaxuFOEjarpbHg9e13vEw8btGSnnSdaI5+lGDwJRWhjXW7HOKSho7rXX8qiExeLBrWdh0ColBIPN1Pseu+Xn0KfPsdsWgYI8N21I/WmYMXFhh1VniNAVLIb3ZctRV2sJOMDNu1O3EVLaH9JPXagbb7a1dY/JJF9d1zVgM73Eni74+vmsvC335HJBRkEVeXW906g2GzWjpfB+ejLun12iaLWjWP1u01Z+nqZRNy6KQJPq8T+JLF8sJc4/XVNjNblAx20XDdGRBN4aTKoH0u50XXGxsd6g5EN6IC5GXiMSKhIE73UyzU5TiuoRnnGfi8TuTW4jjcScI+OMC6Hrs4WKAzID6vs3MgvMkSNiCwnKMXzXIq4S7NdJ/X2YDyJYtIKIiRYTuq755jeWEOM9PjqB+ts3J8B6Fu90ACfk93gyBTUuk6ajMByOl+ijnngN+Dvz++YtqwvDCHw50kAn4PDneS8HmdRpyF0tkbY9GwthqRkghK60Kz1ZVT70SUchCCc7WNq2KaQYlFw8yJj40OofruOWLRMFu4MuDws87eGAkFux8MmVYdTYmckVL9Q7VsclVMixy6fXAA9aN1HO4kMTJsx+vVp8xsGXQgjQlAaIuBBrMlLZd0lBR2C0RuyZavXfm8TpZ7UC2LQt2Z6XFEQkHWQGHQXnUDgfDJXjqVaNR6NK5fHB+8QTK+2Cw+6tWQbuApraULmuBGhu043EkCX7JwuxwN//ntd+TW4nC7HDjcSRp5KLNBQPg2Hyq+JeOL2geK2klJdAzu8cGbRj7UKRS5lUJBHYsiwVg0zNbW6TU+bmJmetzo8xmNAXJZ2ReFsW23NhshN2eIRcPilh49n6Xm0AVr6WRKCVL9aJ0li9IO+J4BEeUh9eOWzNTtciCdSjRPYjAjvxBsSWP3o+dz2gHhuxNpK54UVCwa7p/jmURAbs5aNq9QU5zP6xQvTBkJhq9dkbmIhIKNCdBpyUSta5HKKPzeELlOmp4CsVktzYUfwdIpbdK5vb1FqVRCMr7ITuIJ+D2sH4pFUiqb/FE/bgr9Hz+Y3y/e43M533KOowiKXiBqIgNLWhztKRCO40S7knJr8RYgQslms2xf4ciwnR2Dsbe1guODN8w50zEYJIX8Jva2VlgURtdQS8BYi5GKpny/eK9PO2T+hsolfQNEWp2l0G9k2I5kfLEFihBOLBpmPU6UcNHuVyVTMDJsF51pkowvMpFuO1hemFPuFbsstU0INUGRNFz3HIhoAej6iGXdNNgBv0dWW4RSKpWQzWaRTiWQTiWQjC+y1yTZbBbZbBalUknxOrVaTZQL2KyWZie+nJYoJYR64JxnmGXoCyCi/lzBWVZkenxeJ2xWC2LRMGq1mioYI0S6QqfaJKHWy6sVEL/e3jdA2NY13lbXawdNh10/FpXYyYwZDaZUKiGdSrTAYLmJnB/REO5qjbr6SkPYKp9Kn9X3i/esSYC0Kp1KdAymVqshm80iGV8UZciRUFAERbWUrye6aqMhcvsYewak7YPT6Q0yhwb4vE5EQkGkUwmUSiVFQASAKqrCIp59cACxaLixF56HT/+v2i/WrrFaIyThlra+AaK5bHFzhutPBSwvzLWErDarBSPDdrZeTQ0DdLCA9G9Jy9jn8iUaOt1Hde+JNLrqBEbllVllk+6BcJyODkM+Nzg+eMM287e7Nh0NK0wqRUkkfSavhayrUCkH0Wuu5IDxa+t9e/Z7JBRUj/klfoWqupeVfaRTCXbcBq0vUO1oeWGOnfJwe3vbthWVWoAUM3WtzlxJa84zwNU2Xq8+NfM7ELu/iOoOKolQ1s124/Jwvl+8R61WY/Wx29tb/e08BLzbUgk7hEYse1srd/HFLsZcSNMOp/oxkvFF0elyI8N25j+WF+bMO8xMq3Z8yeL16lNW3iExaL387oCo7sKVSDqVkLW/bpejedKc0UA0bnt+vfr05/mWNs07awX2nk5wC/g96qf1mK0dAs3oIQxjgYgSRQ1r6bRBR7RB04wVRqVlWnLevKPusWYYD4TjGnmJru516ZqI0dqhVkTsHzNlHhCOE6y39+JQSzVTJdNZIj1+vA/EnAt3tXfEKGmTV5hQh+pfICxj7kXz9GWpbVTVZ2bKfCAc1yi5qy4SmSUq9ar60Tpya/F+M1N3A4TjetBAreLEr4ppvEw87mcY5gMhTdG1xblbGDL+4qqYlq0096GY+wHCY7pZ4mdG9KWiGdTU1geD3XsgBEV4ID/70hajwFDDtIzPON1Psaa9Phjs/gBCUGjBidpMcVnqLgq7KKhGU8Kj+H4gudsPFK4jzEyPi78/RI+2tGnj+QE1ozdAOI4TDRKd+866INuVUap/KNam6kfrON1P4fXqUzOaoH9eIEqQIqEg+4Y1trKoll/weUX13XPsba1geWGOHS7W6+f54YComRK3y8Hg1GsHrN+LDnu5KqZRffccp/sp5NbibH/fDw6i90DkEjThN9lQvy+t2gkHnuQH9BH9CYTjONYJ3weD0E/S2xv4SWf5jwvkf/kfSL9Lz2+gp9Jv5vJfolYgIdcR104AAAAASUVORK5CYII=" /><input id="full" type="button" value="Show Full Image" /><input id="partail" type="button" value="Show Partial Image" />
<h3>Image from canvas</h3><div style="border: 1px solid #000000; height: 100px; width: 100px;"></div>

Get a canvas object from an IMG element

HTMLImageElement.prototype.getCanvasFromImage = function(){
  const canvas = document.createElement('canvas');
  canvas.width = this.width;
  canvas.height = this.height;
  const ctx = canvas.getContext('2d');
  ctx.drawImage(this, 0, 0);
  return canvas;
};

const img = document.getElementById('myImage');
img.onload = () => {
  const canvas  = img.getCanvasFromImage();
  const dataURL = canvas.toDataURL();

  console.log(dataURL);
}

<img id="myImage" crossorigin="anonymous" src="https://dl.dropbox.com/s/zpoxft30lzrr5mg/20201012_102150.jpg" />

Insert an img tag into Canvas element

The canvas drawImage method will accept an html img element as an image source, so you can directly do this:

ctx.drawImage(document.getElementById('picture'),0,0);

Example code and a Demo:

window.onload=function(){    var canvas=document.getElementById("canvas");    var ctx=canvas.getContext("2d");    ctx.drawImage(document.getElementById('picture'),0,0);}

body{ background-color: ivory; }#canvas{border:1px solid red; margin:0 auto; }

<canvas id="canvas" width=300 height=300></canvas><!-- src is for this demo. You can still use your <%...%> --><img src='https://dl.dropboxusercontent.com/u/139992952/multple/sun.png' id='picture' style='max-height:100%'>

How can I use an image on an HTML5 canvas without previously having an image on the page?

Use JS to create an image

If you know the path to the image, or can provide it, you can use the following to create an image. It's important to note the image does take time to load and you cannot use the image successfully before it is loaded.

window.onload = function() {  var c = document.getElementById("myCanvas");  var ctx = c.getContext("2d");
  var img = document.createElement("img");
  img.onload = function() {    ctx.drawImage(img, 10, 10);  }
  // triggers onload event (after it loads of course)  img.src = "//via.placeholder.com/350x150";
}

<p>Canvas:</p><canvas id="myCanvas" width="370" height="170" style="border:1px solid #d3d3d3;">Your browser does not support the HTML5 canvas tag.</canvas>

Get frame from Img tag with a url source in Javascript

Use canvas.
1. Draw img tag contents on canvas
2. get DataUri from canvas (encoded base64 string)

var img = document.getElementById("the_img_1");
var canvas = document.getElementById('myCanvas') // reference to canvas element
var ctx = canvas.getContext('2d'); // get the canvas context;
ctx.drawImage(img, 0, 0, 640,480); //draw image into canvas;
encodedImg = canvas.toDataURL("image/png");

Fabric JS - Can i save canvas as image but with background from img tag?

Assuming your end objective is to convert dom to an image.
May be you could try out dom-to-image https://github.com/tsayen/dom-to-image

domtoimage.toJpeg(document.getElementById('my-node'), { quality: 0.95 })
    .then(function (dataUrl) {
        var link = document.createElement('a');
        link.download = 'my-image-name.jpeg';
        link.href = dataUrl;
        link.click();
    });

Here is the codesandbox demo
https://codesandbox.io/s/dom-node-to-png-10odz2