📜  节点吉普 |规模

📅  最后修改于: 2022-05-13 01:56:44.747000             🧑  作者: Mango

节点吉普 |规模

简介: scale()函数是 Nodejs 中的内置函数| Jimp 将图像均匀缩放一个因子。

句法:

scale(scale, mode, cb)

范围:

  • scale - 此参数存储图像的缩放因子。
  • mode – 这是存储缩放方法的可选参数。
  • cb – 这是编译完成时调用的可选参数。

输入图像:

设置环境:

npm init -y

安装依赖:

npm install jimp 

示例 1:

javascript
// npm install --save jimp
// import jimp library to the environment
var Jimp = require('jimp');
 
// User-Defined Function to read the images
async function main() {
  const image = await Jimp.read('
   https://media.geeksforgeeks.org/wp-content/uploads/20190328185307/gfg28.png');
// scale Function having scaling factor as 0.2
  image.scale(.2)
  .write('scale1.png');
}
 
main();
  console.log('Image Processing Completed');


javascript
// npm install --save jimp
// import jimp library to the environment
var Jimp = require('jimp');
 
// User-Defined Function to read the images
async function main() {
  const image = await Jimp.read('
   https://media.geeksforgeeks.org/wp-content/uploads/20190328185333/gfg111.png');
// scale Function having scaling-factor, mode and callback function
  image.scale(3, Jimp.RESIZE_BEZIER, function(err){
    if (err) throw err;
  })
  .write('scale2.png');
}
 
main();
  console.log('Image Processing Completed');


输出:

示例 2:使用 mode 和 cb(可选参数)

javascript

// npm install --save jimp
// import jimp library to the environment
var Jimp = require('jimp');
 
// User-Defined Function to read the images
async function main() {
  const image = await Jimp.read('
   https://media.geeksforgeeks.org/wp-content/uploads/20190328185333/gfg111.png');
// scale Function having scaling-factor, mode and callback function
  image.scale(3, Jimp.RESIZE_BEZIER, function(err){
    if (err) throw err;
  })
  .write('scale2.png');
}
 
main();
  console.log('Image Processing Completed');

输出:

参考: https://www.npmjs.com/package/jimp