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The algorithms and techniques used in the browsers is likely to change over time (especially with Firefox 4 and Chrome 6 coming out so soon, which will place heavy emphasis on canvas rendering performance).In addition, you may want to give SVG a shot, too, as it likely uses a different algorithm as well. The problem with some of this solutions is that they access directly the pixel data and loop through it to perform the downsampling.Here is some code that resizes the image every time you reload the image.

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But it's optimized very well for modern JIT-s, and is ready to use out of box (via npm or bower).

Also, it use webworkers when available to avoid interface freezes.

Depending on the size of the image this can be very resource intensive, and it would be better to use the browser's internal algorithms.

The draw Image() function is using a linear-interpolation, nearest-neighbor resampling method.

The average pixel color in the source will be the average pixel color in the destination, which these other formulas, I think they will not be.

an example of how to use is at the bottom of I converted @syockit's answer as well as the step-down approach into a reusable Angular service for anyone who's interested: I included both solutions because they both have their own pros / cons.

I tried the other methods suggested and none of them look any better.

This is what the different methods resulted in: Photoshop: Canvas: Image with image-rendering: optimize Quality set and scaled with width/height: Image with image-rendering: optimize Quality set and scaled with -moz-transform: Canvas resize on pixastic: I guess this means firefox isn't using bicubic sampling like its supposed to. EDIT3: Original Image So what do you do if all the browsers (actually, Chrome 5 gave me quite good one) won't give you good enough resampling quality? Oh come on, we're entering the new age of Web 3.0, HTML5 compliant browsers, super optimized JIT javascript compilers, multi-core(†) machines, with tons of memory, what are you afraid of?

to use a canvas, please note that there are two ways an image can be resize: by resizing the canvas with css or by drawing the image at a smaller size. If you use CSS to resize the canvas, it will actually stretch (i.e.: resize) the content of the canvas to fit the full canvas (rather than simply increasing or decreasing the area of the canvas.

It'd be worth a shot to try drawing the image into a canvas control with the height and width attributes set to the size of the image and then using CSS to resize the canvas to the size you're looking for.

Is there something I'm missing, some setting that needs to be set or something? I have tried resizing the same jpg on the linked site and in photoshop, and it looks fine when downsized.

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