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AVIF Compression

Terakhir diperbarui:2022-03-30 12:42:52

    Overview

    Image compression refers to reducing an image’s size as much as possible without changing its quality, to reduce its cost for storage and traffic and speed up access.

    COS launched the AVIF compression feature based on CI to convert images into AVIF format, which is a brand-new image format that uses AV1 compression algorithms. It was first introduced by Netflix in February 2020 and has supported browsers such as Chrome and Firefox.

    Restrictions

    • Format: Images in JPG, PNG, BMP, GIF, WebP, TPG, HEIF, or other formats can be converted into AVIF.
    • 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.

    Prerequisites

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

    How to Use

    COS uses the imageMogr2 API of CI to provide AVIF compression service.

    An image can be processed:

    • Upon download
    • Upon upload
    • In cloud
    Note:

    AVIF compression is billed at image advanced compression rates by CI. For detailed pricing, please see the image processing prices of CI.

    API Format

    1. Processing upon download

    download_url?imageMogr2/format/avif
    

    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/avif"
    }]
    }
    

    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/avif"
    }]
    }
    
    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.

    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 avif

    Examples

    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 AVIF format using the following URL:

    http://example-1258125638.cos.ap-shanghai.myqcloud.com/sample.png?imageMogr2/format/avif
    

    Compression ratio comparison

    Format Image Size
    PNG (input image) 1,335.2 KB
    AVIF 62.8 KB (compression ratio: 95.3%)
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