func (i *Image) resize(wand *imagick.MagickWand, w, h uint) {
ow := wand.GetImageWidth()
oh := wand.GetImageHeight()
if (float64(ow) / float64(oh)) < (float64(w) / float64(h)) {
h = oh * w / ow
} else {
w = ow * h / oh
}
wand.SetImageInterpolateMethod(imagick.INTERPOLATE_PIXEL_BICUBIC)
wand.ResizeImage(w, h, imagick.FILTER_LANCZOS2_SHARP, 1)
}