Overview

COS uses the imageMogr2 API provided by CI to blur an image.

An image can be processed:

• Upon download
• Upon upload
• In cloud

Requests

Sample request 1: processing upon download

download_url?imageMogr2/blur/<radius>x<sigma>                            

Sample request 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/blur/<radius>x<sigma>"
}]
}

Sample request 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/blur/<radius>x<sigma>"
}]
}

Note：

Authorization: Auth String (For more information, please see Request Signature.)

Parameters

Operation: blur

Parameter	Description
download_url	URL of the input image, formatted as <bucketname-appid>.cos.<region>.myqcloud.com/<picture name=""> Example: examplebucket-1250000000.cos.ap-shanghai.myqcloud.com/picture.jpeg
	The blur radius. Value range: 1−50
&dxlt;sigma>	The standard deviation of normal distribution. The value must be greater than 0.
/ignore-error/1	If this parameter is carried and the image failed to be processed because it is too large, the input image will be returned with no error reported.

Examples

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, please see Persistent Image Processing and use Processing upon upload or Processing in-cloud data.

Blurring an image with a radius of 8 and the sigma 5

http://examples-1251000004.cos.ap-shanghai.myqcloud.com/sample.jpeg?imageMogr2/blur/8x5

Output image:

Blurring an image with a radius of 8 and the sigma 5 with a signature carried

This example processes the image in the same way as in the example above except that a signature is carried. The signature is joined with other processing parameters using an ampersand (&):

http://examples-1251000004.cos.ap-shanghai.myqcloud.com/sample.jpeg?q-sign-algorithm=<signature>&imageMogr2/blur/8x5

Note：

You can obtain the value of <signature> by referring to Request Signature.