Obtaining Basic Image Information

Last updated: 2021-10-15 18:05:32

    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 &dxlt;BucketName-APPID>.cos.&dxlt;Region>.myqcloud.com/&dxlt;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
    photo_rgb Average hue of the image, such as 0x736246
    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