Image compression is the process of downsizing an image as much as possible without sacrificing quality so that it can be stored at a lower cost and accessed more quickly.
COS launched the AVIF compression feature based on CI 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.
To use AVIF compression, enable the image advanced compression feature for your bucket on the bucket’s configuration page. For more information, see Setting Image Advanced Compression.
COS uses the imageMogr2 API of CI to provide AVIF compression service.
An image can be processed:
Note:AVIF Compression is charged by CI at image advanced compression rates. For detailed pricing, see Image Processing Fees.
GET /<ObjectKey>?imageMogr2/format/avif HTTP/1.1
Host: <BucketName-APPID>.cos.<Region>.myqcloud.com
Date: <GMT Date>
Authorization: <Auth String>
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"
}]
}
Note:
Pic-Operations
is a JSON string. Its parameters are as described in Persistent Image Processing.
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:
- Authorization: Auth String (see Request Signature for more information)
- When this feature is used by a sub-account, relevant permissions must be granted as instructed in Authorization Granularity Details.
Parameter | Description |
---|---|
ObjectKey | Object name, such as folder/sample.jpg . |
/format/<Format> | Compression format, which is 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.
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
Format | Image Size |
---|---|
PNG (input image) | 1,335.2 KB |
AVIF | 62.8 KB (compression ratio: 95.3%) |
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