Question

          var base64str="data:image/jpeg;base64,***"//base64 format of the image
          var buf = Buffer.from(base64str, 'base64');


       jimp.read(buf, (err, image) => {
          if (err) throw err;
        else {
        image.crop(140, 50, 200, 280)
        .quality(100)
         .getBase64(jimp.MIME_JPEG, function (err, src) {
         console.log("rb is \n")
         console.log(src);
              })}})

我正在尝试使用npm中的jimp包来裁剪图像的base64格式，但是出现如下错误：

Error: Could not find MIME for Buffer <null>
    at Jimp.parseBitmap (D:\Node\image-crop\node_modules\@jimp\core\dist\utils\image-bitmap.js:108:15)
    at new Jimp (D:\Node\image-crop\node_modules\@jimp\core\dist\index.js:425:32)
    at _construct (D:\Node\image-crop\node_modules\@jimp\core\dist\index.js:100:393)
    at D:\Node\image-crop\node_modules\@jimp\core\dist\index.js:932:5
    at new Promise (<anonymous>)
    at Function.Jimp.read (D:\Node\image-crop\node_modules\@jimp\core\dist\index.js:931:10)
    at Object.<anonymous> (D:\Node\image-crop\index.js:46:6)
    at Module._compile (internal/modules/cjs/loader.js:689:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:700:10)
    at Module.load (internal/modules/cjs/loader.js:599:32)

有什么方法可以将base64格式的图像集成到Nodejs中而不将其转换为图像

Answer 1

问题出在base64字符串上。要使其正常工作，只需删除前缀data:image/jpeg;base64,，然后保留数据即可。

示例：

const base64str = "R0lGODlhAQABAIAAAAUEBAAAACwAAAAAAQABAAACAkQBADs="//base64 of a 1x1 black pixel
const buf = Buffer.from(base64str, 'base64');

jimp.read(buf, (err, image) => {
  if (err) throw err;
  else {
    image.crop(140, 50, 200, 280)
      .quality(100)
      .getBase64(jimp.MIME_JPEG, function (err, src) {
        console.log("rb is \n")
        console.log(src);
      })
  }
})

输出为：

rb是

数据：图像/ JPEG; BASE64，/ 9J / 4AAQSkZJRgABAQAAAQABAAD / 2wCEAAEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBA [...]

我正在尝试在Node.js中使用jimp包来生成base64格式的图像，但出现错误

1 个答案: