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Basic Image Processing
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Last updated: 2024-03-01 10:49:05
Basic Image Processing
Last updated: 2024-03-01 10:49:05
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Overview

This document provides an overview of APIs and SDK code samples for basic image processing.
Service
Feature
Description
Basic image processing
Proportional scaling, scaling image to target width and height
Regular cropping, cropping and scaling, inscribed circle cropping, intelligent face cropping
Adaptive rotation, regular rotation
Format conversion, GIF format optimization, progressive display
Quality change for JPG and WebP images
Image blurring
Image sharpening
Watermarking
Image information acquisition
Including EXIF information
Quick image format conversion, scaling, and cropping for thumbnail generation


Processing Image During Upload

The following example shows how to automatically process an image when you upload it to COS.
When the image is uploaded successfully, COS will save both the original and the processed images. You can later obtain the processing results by using a general download request.

Sample code

<!-- DOM element on the HTLM page -->

<!-- Choose a file to upload -->
<input id="fileSelector" type="file" />
<!-- Click the button for upload-->
<input id="submitBtn" type="submit" />
function handleFileInUploading(file) {
  cos.putObject(
    {
      Bucket: 'examplebucket-1250000000',
      Region: 'COS_REGION',
      Key: file.name,
      Body: file,
      Headers: {
        // Use the `imageMogr2` API to scale the image (by specifying the width of the output image to 200, with the height scaled proportionally).
        'Pic-Operations':
          '{"is_pic_info": 1, "rules": [{"fileid": "desample_photo.jpg", "rule": "imageMogr2/thumbnail/200x/"}]}',
      },
    },
    function (err, data) {
      console.log(err || data);
    },
  );
}

document.getElementById('submitBtn').onclick = function (e) {
  var file = document.getElementById('fileSelector').files[0];
  if (!file) {
    document.getElementById('msg').innerText = 'No file selected for upload';
    return;
  }
  handleFileInUploading(file);
};

Processing In-Cloud Image

The following example shows how to process an image stored in COS and save the processing result to COS.

Sample code

<!-- DOM element on the HTLM page -->

<!-- Click the button to process the in-cloud image -->
<input id="submitBtn" type="submit" />
function handleFileInBucket() {
  cos.request(
    {
      Bucket: 'examplebucket-1250000000',
      Region: 'COS_REGION',
      Key: 'exampleImage',
      Method: 'POST',
      Action: 'image_process',
      Headers: {
        // Use the `imageMogr2` API to scale the image (by specifying the width of the output image to 200, with the height scaled proportionally).
        'Pic-Operations':
          '{"is_pic_info": 1, "rules": [{"fileid": "desample_photo.jpg", "rule": "imageMogr2/thumbnail/200x/"}]}',
      },
    },
    function (err, data) {
      console.log(err || data);
    },
  );
}

document.getElementById('submitBtn').onclick = function (e) {
  handleFileInBucket();
};

Processing Image During Download

The following example shows how to process an image during download.

Sample code

<!-- DOM element on the HTLM page -->

<!-- Click the button to download and process the image -->
<input id="submitBtn" type="submit" />
function getObject() {
  cos.getObject(
    {
      Bucket: 'examplebucket-1250000000',
      Region: 'COS_REGION',
      Key: 'exampleobject',
      QueryString: `imageMogr2/thumbnail/200x/`,
    },
    function (err, data) {
      console.log(err || data);
    },
  );
}

Generating Signed URL with Image Processing Parameters

Sample code

// Generate a signed URL (valid for 30 minutes) with image processing parameters.
cos.getObjectUrl(
  {
    Bucket: 'examplebucket-1250000000',
    Region: 'COS_REGION',
    Key: 'exampleobject',
    Query: {
        `imageMogr2/thumbnail/200x/`: ''
    },
    Expires: 1800,
    Sign: true,
  },
  function (err, data) {
    if (data) {
      console.log(data.URL);
    }
  },
);

// Generate an unsigned URL with image processing parameters.
cos.getObjectUrl(
  {
    Bucket: 'examplebucket-1250000000',
    Region: 'COS_REGION',
    Key: 'exampleobject',
    Query: {
      `imageMogr2/thumbnail/200x/`: ''
    },
    Sign: false,
  },
  function (err, data) {
    if (data) {
      console.log(data.URL);
    }
  },
);
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