How to apply anti-aliasing in HTML5 canvas's drawImage() function?

For anti-aliasing, you need to set the resampling quality.

ctx.imageSmoothingQuality = "low|medium|high"

Use off-screen canvas to reduce image by half -

var c = document.createElement('canvas'),
ocx = c.getContext('2d');
c.width = img.width * 0.5;
c.height = img.height * 0.5;

ocxx.drawImage(img, 0, 0, c.width, c.height);

// Draw image to reduce by half again and repeat

ocx.drawImage(c, 0, 0, c.width * 0.5, cc.height * 0.5);

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