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    Obtaining Basic Image Information

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

      CI uses the imageInfo API to query an image’s basic information such as its format, width, and height.

      Use Limits

      The input image cannot be larger than 32 MB.
      The width and height of the input image cannot exceed 30,000 pixels and the total number of pixels cannot exceed 250 million. The width and height of the output image cannot exceed 9,999 pixels.
      For an input animated image, the total number of pixels (Width x Height x Number of frames) cannot exceed 250 million pixels.

      API Format

      download_url?imageInfo

      Parameters

      Request parameters

      Operation: imageInfo
      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

      Response parameters

      Parameter
      Description
      format
      Image format such as png or gif
      width
      Width of the image, in pixels
      height
      Height of the image, in pixels
      size
      Image size, in bytes
      md5
      MD5 checksum of the image
      frame_count
      Number of frames. For static images, this value is 1.

      Examples

      Example 1: public-read

      Request

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

      Response

      {"format": "jpeg", "width": "960", "height": "540", "size": "158421", "md5": "77a16fa70e2eba652fb42e8a639c52f2", "photo_rgb": "0x736246"}

      Example 2: private-read with a signature carried

      This example obtains the average hue in the same way as in the example above except that a signature is carried. The signature is joined with other parameters using an ampersand (&):
      http://examples-1251000004.cos.ap-shanghai.myqcloud.com/sample.jpeg?q-sign-algorithm=<signature>&imageInfo
      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 have expired or become inaccessible). 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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