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HEIF Compression

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

    Feature Overview

    Image compression is the process of downsizing an image as much as possible without sacrificing quality so that it can be stored at a lower cost and accessed more quickly.
    CI launched the HEIF compression feature to convert images into HEIF format that offers an ultra-high compression ratio. HEIF offers over 80% smaller file sizes at the same quality compared with JPG. iOS has adopted HEIF as the default image format, and Android P has native support for this format.

    Restrictions

    Format: Images in JPG, PNG, BMP, WebP, TPG, AVIF, or other formats can be converted into HEIF.
    Size: The input image cannot be larger than 32 MB, with its width and height not exceeding 30,000 pixels, and the total number of pixels not exceeding 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.
    Number of frames (for animated images): For GIF, the number of frames cannot exceed 300.

    Preparation

    To use HEIF compression, enable the image advanced compression feature for your bucket on the bucket’s configuration page. For more information, see Setting Image Advanced Compression.

    Use Directions

    CI uses the imageMogr2 API to provide the HEIF compression feature.
    An image can be processed:
    Upon download
    Upon upload
    In cloud
    Note:
    HEIF compression is billed at the image advanced compression ratio. For detailed pricing, see Image Processing Fees.

    API Format

    1. Processing upon download

    download_url?imageMogr2/format/heif

    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/format/heif"
    }]
    }
    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/format/heif"
    }]
    }
    Note:
    Authorization: Auth String (See Request Signature for details.)
    When this feature is used by a sub-account, relevant permissions must be granted.

    Parameters

    Parameter
    Description
    download_url
    URL of the input image, formatted as &lt;BucketName-APPID>.cos.&lt;Region>.myqcloud.com/&lt;picture name>
    Example: examplebucket-1250000000.cos.ap-shanghai.myqcloud.com/picture.jpeg
    /format/<Format>
    Compression format, which is heif

    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, use Processing upon upload or Processing in-cloud data instead.
    Assume that the input image is a 1,335.2 KB image in PNG format, as shown below:
    img
    
    
    You can convert the image into HEIF format by using the following URL:
    http://example-1258125638.cos.ap-shanghai.myqcloud.com/sample.png?imageMogr2/format/heif
    Compression ratio comparison
    Format
    Image Size
    PNG (input image)
    1,335.2 KB
    HEIF
    52.87 KB (compression ratio: 96.0%)
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