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Metadata Removal

Last updated: 2024-06-12 15:20:05

    Feature Overview

    COS uses the imageMogr2 API provided by CI to remove image metadata, including EXIF data.
    An image can be processed:
    Upon download
    Upon upload
    In cloud
    Note:
    Image Processing is charged by CI. For detailed pricing, see Basic image processing fee in Billing and Pricing.

    Restrictions

    Format: JPG, BMP, GIF, PNG, and WebP images can be processed, and HEIF images can be decoded and processed.
    Static image size: The input image cannot be larger than 32 MB. Its dimensions cannot exceed 50,000 pixels and its resolution cannot exceed 250 million pixels. The dimensions of the output image cannot exceed 50,000 pixels.
    WebP image size: The input image cannot be larger than 32 MB. Its dimensions cannot exceed 16,383 pixels and its resolution cannot exceed 250 million pixels. The dimensions of the output image cannot exceed 16,383 pixels.
    Animated image size: For the input or output image, the total number of pixels (width x height x number of frames) cannot exceed 250 million pixels.
    Number of frames (for animated images): For GIF, the number of frames cannot exceed 300.

    API Format

    1. Processing upon download

    GET /<ObjectKey>?imageMogr2/strip HTTP/1.1
    Host: <BucketName-APPID>.cos.<Region>.myqcloud.com
    Date: <GMT Date>
    Authorization: <Auth String>

    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/strip"
      }]
    }
    Note:
    Pic-Operations is a JSON string. Its parameters are as described in Persistent Image Processing.

    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/strip"
      }]
    }
    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.

    Parameters

    Operation: strip
    Parameter
    Description
    ObjectKey
    Object name, such as folder/sample.jpg.
    /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, see Persistent Image Processing and use Processing upon upload or Processing in-cloud data.

    Example 1: Public-read

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

    Example 2: Private-read 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/strip
    Note:
    You can obtain the value of <signature> by referring to Request Signature.

    Notes

    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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