javascript 在 NodeJS 上打开图像并找出宽度/高度
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Opening images on NodeJS and finding out width/height
提问by Mamsaac
Thanks a lot in advance for the future help. What I need is the equivalent of a "new Image()" (and then myImage.src... etc) but on NodeJS. I will thank whoever answers quickly deep in my heart... and well, also saying "thanks!" :P
非常感谢您对未来的帮助。我需要的是相当于“new Image()”（然后是 myImage.src ... 等）但在 NodeJS 上。我会在内心深处感谢快速回答的人......好吧，也说“谢谢！” :P
回答by Linus Unneb?ck
Using imagemagickfor this is very overkill since you only want to read the header of the file and check the dimensions. image-sizeis a pure javascript implementation of said feature which is very easy to use.
使用imagemagick它是非常矫枉过正的，因为您只想读取文件的标题并检查尺寸。image-size是上述功能的纯 javascript 实现，非常易于使用。
https://github.com/image-size/image-size
https://github.com/image-size/image-size
var sizeOf = require('image-size')
sizeOf('images/funny-cats.png', function (err, dimensions) {
if (err) throw err
console.log(dimensions.width, dimensions.height)
})
回答by John Flatness
There's node-imagemagick, (you'll need to have ImageMagick, obviously).
有node-imagemagick，（显然你需要有 ImageMagick）。
var im = require('imagemagick');
im.identify('kittens.jpg', function(err, features){
if (err) throw err
console.log(features)
// { format: 'JPEG', width: 3904, height: 2622, depth: 8 }
})
回答by Vitaly
https://github.com/nodeca/probe-image-sizethat should help. Small + sync/async modes + urls support.
https://github.com/nodeca/probe-image-size应该会有所帮助。小型 + 同步/异步模式 + url 支持。
var probe = require('probe-image-size');
// Get by URL
//
probe('http://example.com/image.jpg', function (err, result) {
console.log(result); // => { width: xx, height: yy, type: 'jpg', mime: 'image/jpeg', wUnits: 'px', hUnits: 'px' }
});
// From the stream
//
var input = require('fs').createReadStream('image.jpg');
probe(input, function (err, result) {
console.log(result);
// => { width: xx, height: yy, type: 'jpg', mime: 'image/jpeg', wUnits: 'px', hUnits: 'px' }
// terminate input, depends on stream type,
// this example is for fs streams only.
input.destroy();
});
// From a Buffer
//
var data = require('fs').readFileSync('image.jpg');
console.log(probe.sync(data)); // => { width: xx, height: yy, type: 'jpg', mime: 'image/jpeg', wUnits: 'px', hUnits: 'px' }
Disclaimer: I am the author of this code.
免责声明：我是此代码的作者。
