Javascript 使用jsdom或Canvas for node.js获取Vibrant.js样例
我有一个使用jsdom或Canvas在node.js中获取图像的过程。在下载过程中,我想在后端使用Vibrant.js提取样例。我下面的代码都不起作用 使用jsdomJavascript 使用jsdom或Canvas for node.js获取Vibrant.js样例,javascript,node.js,image,canvas,jsdom,Javascript,Node.js,Image,Canvas,Jsdom,我有一个使用jsdom或Canvas在node.js中获取图像的过程。在下载过程中,我想在后端使用Vibrant.js提取样例。我下面的代码都不起作用 使用jsdom const Vibrant = require('node-vibrant'); const request = require('request'); var jsdom = require("jsdom").jsdom; var window = jsdom().defaultView; var document = jsd
const Vibrant = require('node-vibrant');
const request = require('request');
var jsdom = require("jsdom").jsdom;
var window = jsdom().defaultView;
var document = jsdom('<html><body></body></html>', {
features: {
FetchExternalResources : ['img']
}
});
var imgDom = document.createElement("img");
imgDom.onload = function() {
console.log('onload triggered');
// var imgData = 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAQAAAADCAIAAAA7ljmRAAAAGElEQVQIW2P4DwcMDAxAfBvMAhEQMYgcACEHG8ELxtbPAAAAAElFTkSuQmCC';
// var imgData = imgDom.replace(/^data:image\/gif;base64,/, "")
// var binaryData = new Buffer(imageData, 'base64').toString('binary');
request.get(imgDom.src, function(err, res, body) {
console.log(body.length);
// Spit out a bunch of base64 code
let v = new Vibrant(new Buffer(body, 'binary').toString('base64'));
// Error image.load not found
// let v = new Vibrant(new Buffer(body, 'binary').toString('base64'), {ImageClass: window.Image});
// Error: Path must be a string without null bytes
// let v = new Vibrant(new Buffer(body, 'base64').toString('binary'));
// v.getPalette().then((palette) => console.log(palette));
var swatches = v.swatches();
console.log(JSON.stringify(swatches));
for (var swatch in swatches)
if (swatches.hasOwnProperty(swatch) && swatches[swatch])
console.log(swatch, swatches[swatch].getHex())
});
}
imgDom.src = 'https://unsplash.it/200';
// imgDom.src = 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAQAAAADCAIAAAA7ljmRAAAAGElEQVQIW2P4DwcMDAxAfBvMAhEQMYgcACEHG8ELxtbPAAAAAElFTkSuQmCC';
我可以在Vibrant.js中使用URL,但这是另一个使用Bluebird的http GET,我需要避免再次调用网络下载
我认为Vibrant.js很难理解Node.js中的图像对象
这里的解决方法是什么,以便我可以将适当的图像类传递给Vibrant.js?正确构建缓冲区
编码:null
返回缓冲区而不是字符串。
(字符串为您提供了无法使用的乱码数据)
额外:使用JIMP Vibrant构造函数的
imagePath
arg直接传递给抽象图像构造函数(NodeImage
在NodeJS环境中,并且NodeImage
使用)
const Vibrant = require('node-vibrant');
const request = require('request');
const Canvas = require('canvas-prebuilt');
const Image = Canvas.Image;
var imgDom = new Image;
imgDom.onload = function() {
console.log('onload triggered');
let v = new Vibrant(imgDom, {ImageClass: Canvas.Image});
v.getPalette().then((palette) => console.log(palette));
};
request.get('https://unsplash.it/200', function(err, res, body) {
console.log(body.length);
imgDom.src = new Buffer(body);
// imgDom.src = new Buffer(body, 'binary').toString('base64');
// imgDom.src = 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAQAAAADCAIAAAA7ljmRAAAAGElEQVQIW2P4DwcMDAxAfBvMAhEQMYgcACEHG8ELxtbPAAAAAElFTkSuQmCC';
});
const Vibrant = require('node-vibrant');
const request = require('request').defaults({encoding:null});
doRequest('https://i.stack.imgur.com/N4TSy.jpg')
function doRequest(url){
request.get(url, function(err, res, body) {
if(err)throw err
//Here is the magic
const buffer = new Buffer(body)
console.log(buffer)
let v = new Vibrant(buffer)
v.getPalette().then((palette) => console.log(palette))
})
}
/*:USING JIMP:*/
doJimpRequest('https://i.stack.imgur.com/N4TSy.jpg')
const Jimp = require('jimp')
function doJimpRequest(url){
Jimp.read(url, function (err, image) {
if(err)throw err
image.getBuffer(Jimp.AUTO,function(err, buffer){
console.log(buffer)
let v = new Vibrant(buffer)
v.getPalette().then((palette) => console.log(palette))
})
});
}