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 WebP compression feature to convert images into WebP format, a format that outperforms JPG in terms of compression. WebP offers over 25% smaller file sizes at the same quality compared with JPG, making it suitable for more clients.
CI uses the imageMogr2 API to provide the WebP compression feature.
An image can be processed:
Note:
- WebP compression is billed at basic image processing rates.
- If an image is converted into WebP, some browsers may not be able to read its EXIF data. As a result, the image cannot be rotated. You can add the
auto-orient
parameter to rotate the input image first (see Rotation) before compressing it.
download_url?imageMogr2/format/webp
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/webp"
}]
}
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/webp"
}]
}
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 webp |
Assume that the input image is a 1,335.2 KB image in PNG format, as shown below:
You can convert the image into WebP format using the following URL:
http://example-1258125638.cos.ap-shanghai.myqcloud.com/sample.png?imageMogr2/format/webp
Output image:
Compression ratio comparison
Format | Image Size |
---|---|
PNG (input image) | 1,335.2 KB |
WebP | 65 KB (compression ratio: 95.13%) |
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