COS implements image watermarking using the watermark API provided by CI, and thus only images stored in CI-bound buckets can be processed.
An image can be processed:
Note:
- Image Processing is charged by CI. For detailed pricing, see Image Processing Fees.
- You can overlay up to 10 image watermarks over a single image.
- An animated image cannot be used as a watermark.
GET /<ObjectKey>?watermark/1/image/<encodedURL>
/gravity/<gravity>
/dx/<dx>
/dy/<dy>
/blogo/<type> HTTP/1.1
Host: <BucketName-APPID>.cos.<Region>.myqcloud.com
Date: <GMT Date>
Authorization: <Auth String>
Note:Spaces and line breaks above are for readability only and can be ignored.
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": "watermark/1/image/<encodedURL>
/gravity/<gravity>
/dx/<dx>
/dy/<dy>
/blogo/<type>"
}]
}
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": "watermark/1/image/<encodedURL>
/gravity/<gravity>
/dx/<dx>
/dy/<dy>
/blogo/<type>"
}]
}
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.
In the code above, watermark
is the operation name and the number 1
indicates that the watermark is an image.
Parameter | Description |
---|---|
ObjectKey | Object name, such as folder/sample.jpg . |
/image/ | Base64 URL-safe encoded URL of the image watermark. For example, if the image watermark URL is http://examplebucket-1250000000.cos.ap-shanghai.myqcloud.com/shuiyin_2.png , you should set this parameter to aHR0cDovL2V4YW1wbGVidWNrZXQtMTI1MDAwMDAwMC5jb3MuYXAtc2hhbmdoYWkubXlxY2xvdWQuY29tL3NodWl5aW5fMi5wbmc . |
/gravity/ | Position of the image watermark, which is a square in a 3x3 grid. Default value: SouthEast |
/dx/ | Horizontal offset in pixels. Default value: 0 |
/dy/ | Vertical offset in pixels. Default value: 0 |
/blogo/ | Adaptation mode for an image watermark that is larger than the input image. Valid values: 1 : scales the image watermark to the size of the input image. 2 : crops the image watermark to the size of the input image. |
/scatype/ | Scaling mode for the image watermark (relative to the input image). This parameter must be used together with /spcent/ . Valid values: 1 : scales by width.2 : scales by height.3 : scales by area. |
/spcent/ | Scale ratio of the image watermark, in permillage. This parameter must be used together with /scatype/ . Value range: /scatype/ is set to 1 ) /scatype/ is set to 2 )/scatype/ is set to 3 ) Example: http://examples-1251000004.cos.ap-shanghai.myqcloud.com/sample.jpeg?watermark/1/image/xxxxxxx/scatype/3/spcent/250 |
/dissolve/ | Opacity of the image watermark. Value range: 1−100. Default value: 90 (meaning 90% opacity) |
/batch/ | Whether to tile the image watermark. If this parameter is set to 1 , the image watermark will be tiled across the input image. |
/degree/ | Angle to rotate the image watermark. This parameter is valid only when /batch/ is set to 1 . Value range: 0−360. Default value: 0 |
Note:An image watermark must:
- Be stored in the same bucket as the input image.
- Have a URL containing a COS domain name (a CDN acceleration domain name such as
examplebucket-1250000000.file.myqcloud.com/shuiyin_2.png
is unsupported) and be accessible (if the image watermark is set to private-read, it must carry a signature).- Have a URL starting with
http://
. Note that “http://” cannot be omitted or changed to “https://”. For example,examplebucket-1250000000.cos.ap-shanghai.myqcloud.com/shuiyin_2.png
andhttps://examplebucket-1250000000.cos.ap-shanghai.myqcloud.com/shuiyin_2.png
are invalid watermark URLs.
The 3x3 grid position diagram is as follows. Once you specify the gravity
parameter for an operation, the corresponding red dot becomes the reference point, and offsets will be relative to this point.
Note:
- If
gravity
is set tocenter
,dx
anddy
are invalid.- If
gravity
is set tonorth
orsouth
,dx
is invalid.- If
gravity
is set towest
oreast
,dy
is invalid.
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, see Persistent Image Processing and use Processing upon upload or Processing in-cloud data.
http://examples-1251000004.cos.ap-shanghai.myqcloud.com/sample.jpeg?watermark/1/image/aHR0cDovL2V4YW1wbGVzLTEyNTEwMDAwMDQucGljc2gubXlxY2xvdWQuY29tL3NodWl5aW4uanBn/gravity/southeast
After an image watermark is added:
https://examples-1251000004.cos.ap-shanghai.myqcloud.com/sample.jpeg?watermark/1/image/aHR0cDovL2V4YW1wbGVzLTEyNTEwMDAwMDQucGljc2gubXlxY2xvdWQuY29tL3NodWl5aW4uanBn/gravity/southeast/batch/1/degree/45/dissolve/40/
The effect of an added image watermark rotated by 45 degrees and tiled with 40% opacity is as follows:
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>&watermark/1/image/aHR0cDovL2V4YW1wbGVzLTEyNTEwMDAwMDQucGljc2gubXlxY2xvdWQuY29tL3NodWl5aW4uanBn/gravity/southeast
Note:You can obtain the value of
<signature>
by referring to Request Signature.
To prevent unauthorized users from accessing or downloading the input image by using a URL that does not contain any processing parameter, you can add the processing parameters to the request signature, making the processing parameters the key of the parameter with the value left empty. The following is a simple example for your reference (it might not be valid or accessible anymore). For more information, please see Request Signature.
http://examples-1251000004.cos.ap-shanghai.myqcloud.com/sample.jpeg?q-sign-algorithm=sha1&q-ak=AKID********************&q-sign-time=1593342360;1593342720&q-key-time=1593342360;1593342720&q-header-list=&q-url-param-list=watermark%252f1%252fimage%252fahr0cdovl2v4yw1wbgvzlteyntewmdawmdqucgljc2gubxlxy2xvdwquy29tl3nodwl5aw4uanbn%252fgravity%252fsoutheast&q-signature=26a429871963375c88081ef60247c5746e834a98&watermark/1/image/aHR0cDovL2V4YW1wbGVzLTEyNTEwMDAwMDQucGljc2gubXlxY2xvdWQuY29tL3NodWl5aW4uanBn/gravity/southeast
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