Use uniapp to implement image compression function

Use uniapp to realize image compression function

With the improvement of mobile phone camera functions, we often take a large number of photos in our daily life. However, these high-resolution photos take up storage space on your phone, making it slow and easy to fill up.

In order to solve this problem, we can use the relevant technology in uniapp to implement the image compression function, compress the image to a smaller file size, and retain appropriate pixels and image quality. Below we will introduce in detail how to implement the image compression function in uniapp.

Step 1: Introduce relevant plug-ins

First, we need to introduce relevant plug-ins into the uniapp project. The most commonly used image compression plug-in is uni-image-compress, which performs image compression operations based on the two libraries imagemin and tinify. In the uniapp project, we can install it through the npm command:

npm install uni-image-compress

After the installation is completed, introduce the plug-in into the page where the image compression function needs to be used:

import uniImageCompress from 'uni-image-compress'

Step 2: Implement the image Compression function

Next, we can call the uniImageCompress.compressImage() method to compress the image wherever we need to compress the image. This method accepts two parameters: the path of the source image and the path of the compressed image.

For example, we can compress the image selected by the user in a click event:

async compressImage() {
  let [err, res] = await uni.chooseImage({
    count: 1, // 选择1张图片
    sourceType: ['album', 'camera'] // 从相册或者拍照
  })
  if (!err) {
    let tempFilePath = res.tempFilePaths[0]
    let compressedFilePath = 'compressed.jpg' // 压缩后的图片路径
    let options = {
      width: 800, // 压缩后的图片宽度
      height: 600, // 压缩后的图片高度
      quality: 0.8 // 压缩质量，范围0-1
    }
    let [compressErr, compressRes] = await uniImageCompress.compressImage(tempFilePath, compressedFilePath, options)
    if (!compressErr) {
      console.log('压缩成功！')
    } else {
      console.log('压缩失败：', compressErr)
    }
  } else {
    console.log('选择图片失败：', err)
  }
}

The above code first selects the user's image through uni.chooseImage() and obtains Temporary file path. Then, compress the image through uniImageCompress.compressImage() and set the compressed image width, height and quality.

Finally, we can print the compression results in the console to determine whether the compression is successful.

Summary

Through the above code example, we can use the image compression plug-in uni-image-compress in uniapp to implement a simple image compression function . Of course, this plug-in has more functions that can be explored, such as supporting compressed image formats, adding watermarks, etc.

Using the image compression function can greatly reduce the size of image files, save mobile phone storage space, and improve the loading speed and operating efficiency of applications. I hope this article can help you implement image compression function in uniapp.

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