Overview

Image compression refers to reducing an image’s size as much as possible without changing its quality, to reduce its cost for storage and traffic and speed up access.

CI launched the AVIF compression feature to convert images into AVIF format, which is a brand-new image format that uses AV1 compression algorithms. It was first introduced by Netflix in February 2020 and has supported browsers such as Chrome and Firefox.

Restrictions

• Format: Images in JPG, PNG, BMP, GIF, WebP, TPG, HEIF, or other formats can be converted into AVIF.
• Size: The input image cannot be larger than 32 MB, with its width and height not exceeding 30,000 pixels, and the total number of pixels not exceeding 250 million. The width and height of the output image cannot exceed 9,999 pixels. For an input animated image, the total number of pixels (Width x Height x Number of frames) cannot exceed 250 million pixels.
• Number of frames (for animated images): For GIF, the number of frames cannot exceed 300.

Prerequisites

• Currently, AVIF compression is in beta testing and only supports buckets in the Beijing, Shanghai, or Guangzhou region.
• To use AVIF compression, enable the image advanced compression feature for your bucket on the bucket’s configuration page. For more information, please see Setting Image Advanced Compression.

How to Use

CI uses the imageMogr2 API to provide the AVIF compression feature.

An image can be processed:

• Upon download
• Upon upload
• In cloud

Note：

AVIF compression is billed at image advanced compression rates.

API Format

1. Processing upon download

download_url?imageMogr2/format/avif

2. Processing upon upload

PUT /<ObjectKey> HTTP/1.1
Host: <BucketName-APPID>.cos.<Region>.myqcloud.com
Date: GMT Date
Authorization: Auth String
Pic-Operations: 
{
"is_pic_info": 1,
"rules": [{
  "fileid": "exampleobject",
  "rule": "imageMogr2/format/avif"
}]
}

3. Processing in-cloud data

POST /<ObjectKey>?image_process HTTP/1.1
Host: <BucketName-APPID>.cos.<Region>.myqcloud.com
Date: GMT Date
Content-length: Size
Authorization: Auth String
Pic-Operations: 
{
"is_pic_info": 1,
"rules": [{
  "fileid": "exampleobject",
  "rule": "imageMogr2/format/avif"
}]
}

Note：

Processing upon download is used as an example here, which does not store the output image in a bucket. If you need to store the output image, use Processing upon upload or Processing in-cloud data instead.

Parameters

Example

Assume that the input image is a 1,335.2 KB image in PNG format, as shown below:

You can convert the image into AVIF format using the following URL:

http://example-1258125638.cos.ap-shanghai.myqcloud.com/sample.png?imageMogr2/format/avif

Compression ratio comparison