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Image Size Limiting

Last updated: 2022-11-09 15:27:34

    Feature Overview

    CI uses the imageMogr2/size-limit API to limit the size of an output image, such as a scaled or compressed image.

    Restrictions

    • Format: The API for limiting the image size is supported only for JPG images.
    • Size: The input image cannot be larger than 32 MB, with its width and height not exceeding 30,000 pixels respectively, and the total number of pixels not exceeding 250 million. The width and height of the output image cannot exceed 9,999 pixels respectively.

    API Sample

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

    Parameters

    Operation name: size-limit.

    Parameter Description
    ObjectKey Object name, such as folder/sample.jpg.
    size-limit Limits the size of the output image. The unit can be k (KB) or m (MB).
    1. Only JPG images are supported.
    2. Appending an exclamation mark (!) means to compare the sizes of the input and output images. If the output image is smaller, the output image will be returned; otherwise, the input image will be returned; for example, examplebucket-1250000000.cos.ap-shanghai.myqcloud.com/picture.jpg?imageMogr2/size-limit/15k!.
    3. We recommend you use this parameter together with strip to remove redundant image metadata, for example, examplebucket-1250000000.cos.ap-shanghai.myqcloud.com/picture.jpg?imageMogr2/strip/format/png/size-limit/15k!.
    /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

    Sample 1: Converting the image format and limiting the output image size

    This example converts a JPG image to PNG format and limits the output image size to 15 KB:

    http://examples-1251000004.cos.ap-shanghai.myqcloud.com/sample.jpeg?imageMogr2/strip/format/png/size-limit/15k!
    

    Sample 2: Converting the image format and limiting the output image size 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/strip/format/png/size-limit/15k!
    
    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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