节点 Jimp |彩色灰度

原文:https://www.geeksforgeeks.org/node-jimp-color-greyscale/

简介 灰度修改器是 Nodejs | Jimp 中的内置颜色修改器，它根据给定的数量(从 0 到 100)将图像颜色去饱和为灰度。 语法:

image.color([
 { apply: 'grayscale', params: [value] }
]);

参数:

• 值–该参数存储要应用的灰度值。它接受 0-100 之间的值。

输入图像:

例 1:

java 描述语言

// 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');
// color function having grayscale modifier
  image.color([{apply:'grayscale', params: [50]}])
  .write('grayscale1.png');
}

main();
  console.log("Image Processing Completed");

输出:

例 2: cb(可选参数)

java 描述语言

//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');
// color function having grayscale modifier
  image.color([{apply:'grayscale', params: [50]}], function(err){
    if (err) throw err;
  })
  .write('grayscale2.png');
}

main();
  console.log("Image Processing Completed");

输出:

参考:T2https://www.npmjs.com/package/jimp

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