节点吉普 |标准化
简介: normalize()函数是 Nodejs 中的内置函数| Jimp 通过计算直方图对图像的颜色进行归一化。
句法:
normalize(cb)
范围:
- 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');
// normalize Function
image.normalize()
.write('normalize1.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');
// Normalize Function having callback function
image.normalize(function(err){
if (err) throw err;
})
.write('normalize2.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');
// Normalize Function having callback function
image.normalize(function(err){
if (err) throw err;
})
.write('normalize2.png');
}
main();
console.log("Image Processing Completed");
输出:
参考: https://www.npmjs.com/package/jimp