How Discord Resizes 150M Images Every Day with Go and C++

Re:How Discord Resizes 150M Images Every Day with Go and C++ by malux85 on Tuesday November 14, 2017 @01:34PM (#15697826)

agree on 3) most browsers just use linear interpolation when resizing images, which makes sense from a performance point of view, but looks terrible. Better to use a bi-linear or cubic resize, more computing up front, but better images, this is probably the reason they do it

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Re:How Discord Resizes 150M Images Every Day with Go and C++ by amelius on Tuesday November 14, 2017 @02:55PM (#15698547)

But soon you can do any type of resizing through WASM on the browser.

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Re:How Discord Resizes 150M Images Every Day with Go and C++ by XCSme on Tuesday November 14, 2017 @04:03PM (#15699092)

You can already do it, just use a library or implement your own scaling function and don't use the built-in image resize functions.

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Re:How Discord Resizes 150M Images Every Day with Go and C++ by searealist on Tuesday November 14, 2017 @11:24PM (#15701441)

bi-linear is linear interpolation

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Re:How Discord Resizes 150M Images Every Day with Go and C++ by nice_byte on Wednesday November 15, 2017 @01:44AM (#15701900)

I think they may have meant "nearest-neighbor", which isn't true for any browsers that I know of.

Regardless, there are still better filters than bilinear, i.e. Lanczos, which I'm pretty sure none of the browsers use.

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Re:How Discord Resizes 150M Images Every Day with Go and C++ by trumpeta on Tuesday November 14, 2017 @04:39PM (#15699415)

This is my understanding as well, you could kill a browser trying to do single-threaded bilinear or cubic resize on a sufficiently large image.

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Re:How Discord Resizes 150M Images Every Day with Go and C++ by Poefke on Wednesday November 15, 2017 @07:03AM (#15703160)

If you resize the image in steps, with each resize at least 50% of the previous step, you can do a pretty decent approximation of cubic resize using the canvas. Doing this for a year now, we've gotten no complaints and we have designers as clients :)

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