Re: [img-conversion] create function (#19)

ImageData only supports RGBA8888 at the moment AFAIK. I've seen another proposal by Apple to extend this, but I think we should wait and see how that proposal works out and not try to jump the gun here.

Image data is not premultiplied, as per using getImageData() on a canvas.

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https://github.com/WICG/img-conversion/issues/19#issuecomment-155776157