📜  节点吉普 |分色

📅  最后修改于: 2022-05-13 01:56:21.004000             🧑  作者: Mango

节点吉普 |分色

简介posterize()函数是 Nodejs 中的内置函数| Jimp 应用n级的分色效果。
句法:

posterize(n, cb)

范围:

  • n - 此参数存储调整对比度的量,最小阈值为两个
  • cb – 这是编译完成时调用的可选参数。

输入图像:

第一步:搭建环境

npm init -y

第 2 步:安装jimp

npm install jimp --save

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');
// sepia function
  image.posterize(4)
  .write('posterize1.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');
// opaque function using callback function
  image.posterize(5, function(err){
    if (err) throw err;
  })
  .write('posterize2.png');
}
 
main();
  console.log("Image Processing Completed");


输出:

示例 2:使用 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');
// opaque function using callback function
  image.posterize(5, function(err){
    if (err) throw err;
  })
  .write('posterize2.png');
}
 
main();
  console.log("Image Processing Completed");

输出:

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