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 HEIF compression feature to convert images into HEIF format that offers an ultra-high compression ratio. HEIF offers over 80% smaller file sizes at the same quality compared with JPG. iOS has adopted HEIF as the default image format, and Android P has native support for this format.
To use HEIF 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.
CI uses the imageMogr2 API to provide the HEIF compression feature.
An image can be processed:
Note:HEIF compression is billed at image advanced compression rates.
download_url?imageMogr2/format/heif
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/heif"
}]
}
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/heif"
}]
}
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.
Parameter | Description |
---|---|
download_url | URL of the input image, formatted as &dxlt;BucketName-APPID>.cos.&dxlt;Region>.myqcloud.com/&dxlt;picture name> Example: examplebucket-1250000000.cos.ap-shanghai.myqcloud.com/picture.jpeg |
/format/&dxlt;Format> | Compression format, which is heif |
Assume that the input image is a 1,335.2 KB image in PNG format, as shown below:
You can convert the image into HEIF format using the following URL:
http://example-1258125638.cos.ap-shanghai.myqcloud.com/sample.png?imageMogr2/format/heif
Compression ratio comparison
Format | Image Size |
---|---|
PNG (input image) | 1,335.2 KB |
HEIF | 52.87 KB (compression ratio: 96.0%) |
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