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並前往https://www.smashingmagazine.com/2011/08/optimize-images-with-html5-canvas/

How To Optimize Images With HTML5 Canvas - Smashing ...

drawImage (img, 0, 0); // Get image pixels var imageData = ctx.getImageData(0, 0, canvas.width, canvas.height); var pixels = imageData.data; ...

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