[英]How do I resize an image proportionally using blur instead of letterbox on Node.js?
I have a photo which is a rectangle and I want to resize it down to a square while preserving the aspect ratio .我有一张矩形的照片,我想将其缩小为正方形,同时保留纵横比。 Libraries like Sharp allow you to do that by applying letterboxing to the resulting image.
像Sharp这样的库允许您通过对生成的图像应用信箱来做到这一点。
await sharp(photoBuffer).resize({ width: 200, height: 200, fit: 'contain' })
This is the result:这是结果:
Instead of applying letterboxing I'd like the remaining empty space to be filled with a 2nd blurred version of the image, placed behind the resized one, like so:而不是应用信箱,我希望剩余的空白空间填充图像的第二个模糊版本,放置在调整大小的图像后面,如下所示:
Is there a Node.js library that does that out of the box or some custom way of achieving this?是否有开箱即用的 Node.js 库或实现此目的的某种自定义方式?
This is how you do it using Sharp:这是使用 Sharp 的方法:
import Sharp from 'sharp'
export default function({ pathToInputFile, pathToOutputFile, size, blur }) {
let sharpOriginal = Sharp(pathToInputFile)
return new Promise((resolve) => {
sharpOriginal
.resize({ width: size }) // the result will be a square
.toBuffer()
.then((blurredAsBuffer) => {
sharpOriginal
.resize(size, size, {
fit: 'cover'
})
.blur(blur) // blur = 6 seems to work well
.composite([{
input: blurredAsBuffer,
gravity: 'center'
}])
.toFile(pathToOutputFile)
.then((info) => {
console.log(info)
resolve(true)
})
.catch((err) => {
console.error(err))
resolve(false)
})
})
.catch((err) => {
console.error(err))
resolve(false)
})
}
You can try look into filter 's blur
function.您可以尝试查看过滤器的
blur
function。
You can also use SVG
filter for more options您也可以使用
SVG
滤波器以获得更多选项
Here's an example: https://css-tricks.com/the-blur-up-technique-for-loading-background-images/这是一个示例: https://css-tricks.com/the-blur-up-technique-for-loading-background-images/
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