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    Grayscale Image

    Last updated: 2024-02-18 10:36:35
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      Feature Overview

      CI uses the imageMogr2/grayscale API to set an image to be a grayscale image.

      API Sample

      1. Processing during download

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

      2. Processing during 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/grayscale/<value>"
        }]
      }
      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/grayscale/<value>"
        }]
      }

      Parameters

      Operation name: grayscale.
      Parameter
      Description
      ObjectKey
      Object name, such as folder/sample.jpg.
      /grayscale/<value>
      Whether to set an image to be a grayscale image.
      Valid values of the value field: 0 (no), 1 (yes).
      /ignore-error/1
      If this parameter is carried and the image fails to be processed because the image is too large or a parameter value exceeds the limit, the input image will be returned with no error reported.

      Samples

      Note:
      Processing during 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 the processing during upload or processing in-cloud data feature.

      Sample 1: Setting an image to be a grayscale image

      This example sets an image to be a grayscale image:
      http://examples-1251000004.cos.ap-shanghai.myqcloud.com/sample.jpeg?imageMogr2/grayscale/1
      Output image:
      
      img
      
      

      Sample 2: Sharpening an image 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 concatenated with other processing parameters by an ampersand (&).
      http://examples-1251000004.cos.ap-shanghai.myqcloud.com/sample.jpeg?q-sign-algorithm=<signature>&imageMogr2/grayscale/1
      Note:
      You can get the value of <signature> as instructed in 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 sample for your reference (it might have expired or become inaccessible). For more information, see Upload via Pre-Signed URL.
      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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