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    <p>Fast image resize/resample algorithm using <strong>Hermite</strong> filter with JavaScript. Support transparency, gives good quality. Preview: <br /><br /><img src="https://i.stack.imgur.com/oek4l.png" alt="enter image description here"><br /></p> <p><strong>Update</strong>: version 2.0 added on GitHub (faster, web workers + transferable objects). Finally i got it working! </p> <p>Git: <a href="https://github.com/viliusle/Hermite-resize" rel="nofollow noreferrer">https://github.com/viliusle/Hermite-resize</a><br /> Demo: <a href="http://viliusle.github.io/miniPaint/" rel="nofollow noreferrer">http://viliusle.github.io/miniPaint/</a></p> <pre><code>/** * Hermite resize - fast image resize/resample using Hermite filter. 1 cpu version! * * @param {HtmlElement} canvas * @param {int} width * @param {int} height * @param {boolean} resize_canvas if true, canvas will be resized. Optional. */ function resample_single(canvas, width, height, resize_canvas) { var width_source = canvas.width; var height_source = canvas.height; width = Math.round(width); height = Math.round(height); var ratio_w = width_source / width; var ratio_h = height_source / height; var ratio_w_half = Math.ceil(ratio_w / 2); var ratio_h_half = Math.ceil(ratio_h / 2); var ctx = canvas.getContext("2d"); var img = ctx.getImageData(0, 0, width_source, height_source); var img2 = ctx.createImageData(width, height); var data = img.data; var data2 = img2.data; for (var j = 0; j &lt; height; j++) { for (var i = 0; i &lt; width; i++) { var x2 = (i + j * width) * 4; var weight = 0; var weights = 0; var weights_alpha = 0; var gx_r = 0; var gx_g = 0; var gx_b = 0; var gx_a = 0; var center_y = (j + 0.5) * ratio_h; var yy_start = Math.floor(j * ratio_h); var yy_stop = Math.ceil((j + 1) * ratio_h); for (var yy = yy_start; yy &lt; yy_stop; yy++) { var dy = Math.abs(center_y - (yy + 0.5)) / ratio_h_half; var center_x = (i + 0.5) * ratio_w; var w0 = dy * dy; //pre-calc part of w var xx_start = Math.floor(i * ratio_w); var xx_stop = Math.ceil((i + 1) * ratio_w); for (var xx = xx_start; xx &lt; xx_stop; xx++) { var dx = Math.abs(center_x - (xx + 0.5)) / ratio_w_half; var w = Math.sqrt(w0 + dx * dx); if (w &gt;= 1) { //pixel too far continue; } //hermite filter weight = 2 * w * w * w - 3 * w * w + 1; var pos_x = 4 * (xx + yy * width_source); //alpha gx_a += weight * data[pos_x + 3]; weights_alpha += weight; //colors if (data[pos_x + 3] &lt; 255) weight = weight * data[pos_x + 3] / 250; gx_r += weight * data[pos_x]; gx_g += weight * data[pos_x + 1]; gx_b += weight * data[pos_x + 2]; weights += weight; } } data2[x2] = gx_r / weights; data2[x2 + 1] = gx_g / weights; data2[x2 + 2] = gx_b / weights; data2[x2 + 3] = gx_a / weights_alpha; } } //clear and resize canvas if (resize_canvas === true) { canvas.width = width; canvas.height = height; } else { ctx.clearRect(0, 0, width_source, height_source); } //draw ctx.putImageData(img2, 0, 0); } </code></pre>
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    1. POResizing an image in an HTML5 canvas
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    1. COMaybe you can include links to your miniPaint demo and Github repo?
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    2. COWill you also share the webworkers version as well? Probably due to setup overhead, it's slower for small images, but it could be useful for larger source images.
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    3. COadded demo, git links, also multi-core version. Btw i did not spend too much time on optimizing multicore version... Single version i believe is optimized well.
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